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Dissertations / Theses on the topic 'Ecology acoustic'

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Published: 4 June 2021
Last updated: 6 February 2022

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1

Pontén, Emeli. "Acoustic Design in Urban Development : analysis of urban soundscapes and acoustic ecology research in New York City." Thesis, Högskolan Dalarna, Ljud- och musikproduktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:du-4836.

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The world is urbanizing rapidly with more than half of the global population now living in cities. Improving urban environments for the well-being of the increasing number of urban citizens is becoming one of the most important challenges of the 21st century. Even though it is common that city planners have visions of a ’good urban milieu’, those visions are concerning visual aesthetics or practical matters. The qualitative perspective of sound, such as sonic diversity and acoustic ecology are neglected aspects in architectural design. Urban planners and politicians are therefore largely unaware of the importance of sounds for the intrinsic quality of a place. Whenever environmental acoustics is on the agenda, the topic is noise abatement or noise legislation – a quantitative attenuation of sounds. Some architects may involve acoustical aspects in their work but sound design or acoustic design has yet to develop to a distinct discipline and be incorporated in urban planning.My aim was to investigate to what extent the urban soundscape is likely to improve if modern architectural techniques merge with principles of acoustics. This is an important, yet unexplored, research area. My study explores and analyses the acoustical aspects in urban development and includes interviews with practitioners in the field of urban acoustics, situated in New York City. My conclusion is that to achieve a better understanding of the human living conditions in mega-cities, there is a need to include sonic components into the holistic sense of urban development.
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Grimshaw, Mark Nicholas. "The Acoustic Ecology of the First-Person Shooter." The University of Waikato, 2007. http://hdl.handle.net/10289/2653.

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This thesis contributes to the field of Game Studies by presenting the hypothesis that the player(s) and soundscape(s) in the first-person shooter (FPS) game, and the relationships between them, may be construed as an acoustic ecology. It explores the idea that the single-player FPS game acoustic ecology has the basic components of player and soundscape and that the relationships between these two lead to the creation and perception of a variety of spaces within the game world constituting a significant contributing factor to player immersion in that world. Additionally, in a multiplayer FPS game, these individual acoustic ecologies form part of a larger acoustic ecology which may be explained through autopoietic principles. There has been little written on digital game sound (much less on FPS game sound) and so the research contained within this thesis is an important contribution to the Game Studies field. Furthermore, the elaboration of the hypothesis provides insight into the role of sound in the perception of a variety of spaces in the FPS game, and player immersion in those spaces, and this has significance not only for Game Studies but also for other disciplines such as virtual environment design and the study of real-world acoustic ecologies. A text-based methodology is employed in which literature from a range of disciplines is researched for concepts relevant to the hypothesis but, where necessary, new concepts will be devised. The aim of the methodology is to construct a conceptual framework which is used to explicate the hypothesis and which may, with future refinement, be used for the study of sound in digital game genres other than FPS.
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Grant, Paul Brian Charles. "Acoustic profiling of the landscape." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86463.

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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Soft, serene insect songs add an intrinsic aesthetic value to the landscape. Yet these songs also have an important biological relevance. Acoustic signals across the landscape carry a multitude of localized information allowing organisms to communicate invisibly within their environment. Ensifera are cryptic participants of nocturnal soundscapes, contributing to ambient acoustics through their diverse range of proclamation songs. Although not without inherent risks and constraints, the single most important function of signalling is sexual advertising and pair formation. In order for acoustic communication to be effective, signals must maintain their encoded information so as to lead to positive phonotaxis in the receiver towards the emitter. In any given environment, communication is constrained by various local abiotic and biotic factors, resulting in Ensifera utilizing acoustic niches, shifting species songs spectrally, spatially and temporally for their optimal propagation in the environment. Besides the importance of Ensifera songs from an ethological point of view, the multitude of species-specific signals provide an acoustic tapestry representing species diversity across ecological gradients and over time. Acoustic inventorying and monitoring of the landscape can reflect the environmental status of ecological systems, from natural to disturbed by human influence. In contrast to traditional survey techniques, sound recording and interpretation is a non-invasive method that allows for the detection and classification of highly cryptic, yet insightful indicators of ecosystem change. Here, acoustic monitoring was used across diverse ecological gradients to improve understanding of species diversity patterns, and how they change in response to both natural gradients and in response to the human dominated landscape mosaic. This study was undertaken in three geographic locations from tropical rain forest of Brunei, Borneo, to the landscapemosaic of plantation forestry in KwaZulu-Natal, South Africa, and to the botanically rich, mountain fynbos region of the Cape Floristic Region, also in South Africa. Each region provided a diverse and particular landscape to test the value of acoustic surveys for determining local diversity patterns across natural gradients and to assess the value of the technique for assessing the impact human influence across landscapes. In tropical rainforests, an entire acoustic guild was investigated to determine how acoustic species partition their acoustic communication channels spectrally, temporally and spatially, to avoid acoustic interference. The overall assemblage showed considerable spectral partitioning. Diurnally active species showed low temporal niche overlap, whereas nocturnal species did not utilize temporal partitioning. Lack of nocturnal temporal partitioning suggests other mechanisms of acoustic avoidance are sufficient to avoid acoustic overlap, or that there are insufficient cues to partition nocturnal acoustic environments. Acoustic species also utilized spatial partitioning, with distinct acoustic assemblages at vertical heights and with elevation. Utilization of a range of different strategies allow many species to communicate with conspecifics with little or no interference from other species in a signal rich environment. Acoustic profiling was also undertaken in KwaZulu-Natal, South Africa, across a plantation forestry landscape mosaic with diverse ecological gradients containing both alien and indigenous vegetation, as well as boarding large natural protected areas. Areas covered in alien timber or non-endemic grass were devoid of acoustic signals. Managed areas that were mowed and heavily grazed were not effective in maintaining the natural complement of nocturnal acoustic species. Within natural vegetation patches inside plantations, acoustic species richness increased with plant heterogeneity and patch size. Patches of indigenous vegetation within the plantation matrix effectively reduced the contrast of transformed landscapes with surrounding natural areas, with indigenous forest patches containing a highly characteristic acoustic species assemblage. Within the botanically rich, mountain fynbos region of the Cape Floristic Region, acoustic profiling was conducted across gradients of elevation, season and vegetation. Across these gradients, katydid acoustic signals were identified and characterized for the first time. This resulted in the discovery of two new katydid species and a novel sound producing structure in a carabid beetle, a species previously unknown to produce sound. Acoustic diversity across seasonal and elevational gradients increased with increasing temperatures. Climatic variability along the elevational gradient produced variation in seasonal phenology. Katydids also utilized high frequency acoustic signals, which is probably an adaptation to overcome background noise from wind, so prevalent in this area. Furthermore, despite producing conspicuous signals for mate attraction and pair formation, katydids were found not to be part of bat-eared fox diet, an insectivorous, nocturnal predator that uses its characteristic large ears to detect sounds made by invertebrate prey. This study shows the value of using acoustic emissions from katydids to identify acoustic diversity patterns across ecological gradients and in response to human impacts on the landscape.<br>AFRIKAANSE OPSOMMING: Sagte, rustige insekliedjies voeg ‘n intrinsieke estetiese waarde aan die landskap. Tog is hierdie liedjies ook van belangrike biologiese waarde. Akoestiese seine oor die landskap dra ‘n magdom plaaslike inligting wat organismes in staat stel om onsigbaar te kommunikeer binne hul omgewing. Langhoringsprinkane is kriptiese deelnemers van die nagtelike klankomgewing en dra by tot die omringende akoestiek deur hul verskeidenheid van proklamasieliedjies. Alhoewel dit nie sonder inherente risiko’s en beperkings is nie, is die belangrikste funksie van seine seksuele advertering en paarvorming. Vir akoestiese kommunikasie om effektief te wees, moet seine hul geënkodeerde inligting handhaaf, sodat dit sal lei tot positiewe fonotaksis in die ontvanger teenoor die emittor. In enige gegewe omgewing, word kommunikasie beperk deur verskeie plaaslike abiotiese en biotiese faktore. Dit lei tot die gebruik van akoestiese nisse deur langhoringsprinkane, wat hulle liedjies spektraal, ruimtelik en temporeel aanpas vir optimale verspreiding in die omgewing. Benewens die belang van die langhoringsprinkaan liedjies uit ʼn etologiese oogpunt, bied die menigte spesie-spesifieke seine ʼn akoestiese tapisserie wat spesiesdiversiteit verteenwoordig oor ekologiese gradiënte en oor tyd. Akoestiese opname en monitering van die landskap kan die omgewingstoestand van ekologiese stelsels weerspieël, van natuurlike tot menslik versteurde stelsels. In teenstelling met tradisionele opnametegnieke, is klankopname en interpretasie ʼn nie-indringende metode wat dit moontlik maak om hoogs kriptiese, nog insiggewende indikators van ekosisteemverandering op te spoor en te klassifiseer. In hierdie studie is akoestiese monitering gebruik oor diverse ekologiese gradiënte om ons begrip te verbeter van spesies diversiteitspatrone, en hoe dit verander in reaksie op beide natuurlike gradiënte en in reaksie op die menslik gedomineerde landskapmosaïek. Hierdie studie is onderneem in drie geografiese liggings: tropiese reënwoud in Brunei, Borneo, die landskapmosaïek van plantasiebosbou in KwaZulu-Natal, Suid-Afrika, en die plantryke, bergfynbos-streek van die Kaap Floristiese Streek, ook in Suid-Afrika. Elke streek het 'n diverse en besondere landskap verskaf om die waarde van akoestiese opnames te toets vir die bepaling van plaaslike diversiteitspatrone in natuurlike gradiënte, asook om die waarde van die tegniek te bepaal vir die beoordeling van die impak van menslike invloed oor landskappe. In tropiese reënwoude, is 'n hele akoestiese gilde ondersoek om te bepaal hoe akoestiese spesies hul akoestiese kommunikasiekanale spektraal, ruimtelik en temporeel verdeel om akoestiese inmenging te vermy. Die algehele groep het aansienlike spektrale verdeling getoon. Dagaktiewe spesies het lae temporele nisoorvleueling getoon, terwyl nagtelike spesie nie temporele verdeling benut het nie. Gebrek aan nagtelike temporele verdeling dui daarop dat ander meganismes van akoestiese vermyding voldoende is om akoestiese oorvleueling te vermy, of dat daar onvoldoende seine is om nagtelike akoestiese omgewings te verdeel. Akoestiese spesies het ook ruimtelike verdeling benut, met verskillende akoestiese spesiesversamelings op vertikale hoogtes en met hoogte bo seevlak. Die gebruik van 'n verskeidenheid van strategieë maak dit moontlik vir spesies om te kommunikeer met min of geen inmenging van ander spesies in 'n seinryke omgewing. Akoestiese profielsamestelling is ook onderneem in KwaZulu-Natal, Suid-Afrika, oor 'n plantasiebosbou landskapmosaïek met diverse ekologiese gradiënte wat beide uitheemse en inheemse plantegroei, sowel as groot, natuurlike, beskermde gebiede ingesluit het. Gebiede wat bestaan het uit uitheemse timmerhoutbome of nie-endemiese gras, was heeltemal sonder akoestiese seine. Bestuursgebiede wat gesny en swaar bewei was, het nie doeltreffend die natuurlike komplement van nagtelike akoestiese spesies gehandhaaf nie. In natuurlike plantegroei fragmente binne plantasies, het akoestiese spesiesrykheid toegeneem met plantverskeidenheid en fragmentgrootte. Fragmente van inheemse plantegroei binne die plantasiematriks het effektief die kontras van getransformeerde landskappe met omliggende natuurlike gebiede verminder, en inheemse woudefragmente het hoogs kenmerkende akoestiese spesiesversamelings gehad. Binne die plantryke bergfynbosstreek van die Kaap Floristiese Streek, was akoestiese profielsamestelling gedoen oor gradiënte van hoogte bo seevlak, seisoen en plantegroei. Oor hierdie gradiënte, is langhoringsprinkaan akoestiese seine geïdentifiseer en gekenmerk vir die eerste keer. Dit het gelei tot die ontdekking van twee nuwe langhoringsprinkaan spesies en 'n nuwe klankvervaardiging struktuur in 'n Carabid kewer, 'n spesie wat nie voorheen bekend was om klank te produseer nie. Akoestiese diversiteit oor gradiënte van seisoen en hoogte bo seevlak het toegeneem met toenemende temperature. Variasie in klimaatstoestande oor die gradiënt van hoogte bo seevlak het variasie in seisoenale fenologie veroorsaak. Langhoringsprinkane het ook hoë frekwensie akoestiese seine benut, wat waarskynlik 'n aanpassing is om agtergrondgeraas van die wind, wat so algemeen is in hierdie gebied, te bowe te kom. Verder, ten spyte van die vervaardiging van opvallende seine vir maataantrekking en paarvorming, het langhoringsprinkane nie deel gevorm van die bakoorjakkals se dieet nie. Hierdie is 'n insekvretende, nagtelike roofdier wat gebruik maak van sy kenmerkende groot ore om klanke op te spoor wat gemaak word deur invertebraatprooi. Hierdie studie toon die waarde van die gebruik van akoestiese seine van langhoringsprinkane om akoestiese diversiteitspatrone te identifiseer oor ekologiese gradiënte en in reaksie op menslike impakte op die landskap.
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van, Opzeeland Ilse [Verfasser]. "Acoustic ecology of marine mammals in polar oceans / Ilse van Opzeeland." Bremerhaven : AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung, 2010. http://d-nb.info/1010221175/34.

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Bolanos, Sittler Pablo Rafael. "Acoustic behavior and ecology of the Resplendent Quetzal Pharomachrus mocinno, a flagship tropical bird species." Thesis, Paris, Muséum national d'histoire naturelle, 2019. http://www.theses.fr/2019MNHN0001/document.

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Le Quetzal Resplendissant Pharomachrus mocinno est une espèce d’oiseau tropical considérée fortement menacée par la perte de son habitat due aux activités humaines. Le Quetzal Resplendissant joue un rôle important de disperseur de graines et constitue le centre de la culture maya passée et présente. Les recherches sur cette espèce couvrent plusieurs aspects de son histoire naturelle et de sa biologie. Néanmoins, à ce jour, il n’y a aucune description détaillée du comportement et de l’écologie acoustiques de cette espèce, condition préalable à une conservation efficace de l'espèce. L’objectif de cette thèse a été d’étudier tout particulièrement le comportement et l’écologie acoustique de P. mocino dans la forêt nuageuse du Guatemala. Une analyse détaillée des vocalisations de P. mocinno, incluant des expériences de propagation de ses vocalisations dans son habitat, a permis d’identifier deux types de vocalisations destinés à la communication à longue distance et deux autres types de vocalisations destinés à la communication à courte distance. La quantification des différences dans les vocalisations territoriales des deux sous-espèces de Quetzals Resplendissants, P. m. mocinno (partie nord de l’Amérique centrale et sud du Mexique) et P. m. costaricensis (sud de l'Amérique centrale) a révélé de nettes différences entre les sous-espèces, ce qui conforterait l'hypothèse d’espèces distinctes. L'observation de l'espèce dans la canopée dense est difficile et la manipulation des individus est controversée en raison de sa grande importance culturelle. De fait, un système acoustique automatique a été mis au point pour suivre l’espèce de manière non invasive. Le système s'est avéré efficace et a produit des résultats révélant des profils de suivis acoustiques en partie dépendants de variables environnementales. Enfin, la communauté acoustique des oiseaux à laquelle P. mocinno appartient a été analysée afin d’évaluer les interactions interspécifiques de compétition. Les recherches développées ici devraient aider aux décisions de conservation futures concernant le Quetzal Resplendissant et son habitat, la forêt nuageuse. Cette recherche montre également que l'écoacoustique peut constituer une stratégie utile pour aborder les problèmes d'écologie et de conservation dans les zones tropicales<br>The Resplendent Quetzal Pharomachrus mocinno is a tropical bird considered in a high risk of danger. Degradation of its habitat caused by human activities is the principal menace. The Resplendent Quetzal is important as seed disperser and is the centre of the past and present Mayan culture. The available studies about the species have covered aspects of the natural history and biology. Nevertheless, the description of the acoustic behaviour and ecology, a prerequisite for the conservation of the species, was not available. The general aim of this PhD thesis was to investigate the acoustic behaviour and ecology of P. mocinno in the cloud forest of Guatemala. A detailed analysis of P. mocinno vocalizations, including propagation experiments of these vocalizations in its habitat, led to identify two vocalizations intended for long range, and two for short range communication. Quantification of acoustic parameters in territorial vocalizations of the two subspecies of the Resplendent Quetzal, P. m. mocinno (north part of Central America and Chiapas) and P. m. costaricensis (south part of Central America), revealed clear differences between the subspecies, that could support a species separation hypothesis. . The observation of the species in the dense canopy is difficult and manipulation of individuals is controversial due to its high cultural importance. Then, an automatic acoustic system was developed as a method to study the species in a non-invasive way. The system proved to be efficient and returned results that revealed acoustic patterns linked to environmental variables. Finally, the acoustic community of other bird species P. mocinno belongs to was analysed so that interspecific competition interactions could be assessed. The research here developed should help in future conservation decisions about the Resplendent Quetzal and its habitat, the cloud forest. This research also illustrates that ecoacoustics can be a valuable strategy to tackle ecology and conservation questions in tropical areas
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Gedert, Jennifer. "Calling ecology of micro frogs (Microbatrachella capensis): a case study using acoustic spatial capture recapture." Master's thesis, Faculty of Science, 2020. http://hdl.handle.net/11427/32638.

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Amphibians worldwide are declining, increasing the demand for monitoring populations of many threatened amphibians, including the South African Critically Endangered micro frog (Microbatrachella capensis). I attempted to improve ongoing monitoring efforts by determining the calling ecology of the micro frog population on the Cape Flats. I used acoustic spatial capture recapture to calculate call density and identify the main factors that determine periods of maximum frog calls. Increased calling behaviour was found early in the season and in response to rainfall. In addition, micro frogs were found to call more at night than during the day. This suggests that future monitoring of this species should occur at night, after rain, and early in the winter breeding season. From the call density estimates, I calculated the size of the micro frog population on the Cape Flats to be about 200 adult frogs when an equal sex ratio of adult males and females is assumed. Future monitoring and conservation efforts should take into consideration this baseline population estimate and keep track of any demographic trends in the population.
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Moxham, Emily Jeanne. "The spatial ecology of Albula glossodonta in the St. Joseph Atoll, Seychelles." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/57863.

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Bonefish (Albula spp.) support valuable recreational and artisanal fisheries worldwide. Declining stocks have been reported at multiple localities, potentially jeopardising numerous multimillion-dollar industries. In particular, tourism generated through bonefish fly fishing contributes considerably to the economies of many isolated tropical islands and atolls. However, despite their economic value, little is known about bonefish in the Indian Ocean. This study aimed to contribute to the understanding of bonefish ecology in the Indian Ocean by (1) reviewing the bonefish literature to identify knowledge gaps; (2) evaluating the postrelease survival of acoustically tagged bonefish and; (3) quantifying the spatial and temporal movements of bonefish at a near-pristine and predator rich atoll in the Seychelles. A review of published literature on bonefish indicated that despite considerable biological and ecological research in the Pacific and Atlantic oceans, virtually no research has been conducted in the Indian Ocean. To help address this research gap, an acoustic telemetry study was initiated at the remote St. Joseph Atoll, within an existing array of 88 automated datalogging acoustic receivers. Thirty Albula glossodonta were surgically implanted with Vemco V13 acoustic transmitters in May 2015 and tracked for a period of one year. Only 10% of the tagged bonefish were detected for more than two weeks. A comparison of the final 100 hours of movement data from fish that were detected for less than two weeks to fish detected for longer periods revealed distinct differences. These included differences in area use patterns and significant differences in the average daily distance moved, speed of movement and residency index. This suggested that mortality in the form of post-release predation was high (90%) with tagged fish detected for less than two weeks being preyed upon by sharks. The three surviving bonefish were tracked for 210 to 367 days. These individuals remained in the atoll and showed high use of the marginal habitats between the shallow sand flats and the deeper lagoon. Water temperature, diel cycle and tide were significant predictors of bonefish presence in the lagoon. The high post-release predation of bonefish has implications for the management of this and other Albula species. Despite these fisheries being catch-and-release, bonefish fishing may be unsustainable due to the high post-release mortality, particularly in areas that are rich in predators. Therefore, protected areas or limitations on fishing effort need to be considered.
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Miguel, Fábio [UNESP]. "Entre ouvires: a paisagem sonora da Igreja Batista em Jardim Utinga em foco." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/95110.

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Made available in DSpace on 2014-06-11T19:27:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-07-07Bitstream added on 2014-06-13T18:31:38Z : No. of bitstreams: 1 miguel_f_me_ia.pdf: 724845 bytes, checksum: 46775c462e4fbac420175f8a862db682 (MD5)<br>Universidade Estadual Paulista (UNESP)<br>Esta pesquisa tem como objetivos principais diagnosticar o ambiente sonoro da Igreja Batista em Jardim Utinga e compreender de que maneira os membros se relacionam com este espaço acústico. Para isso, revisa-se a literatura da área de som ambiental Ecologia Acústica em interface com a Educação Ambiental, para entendimento das diferentes dimensões: sociais, culturais e econômicas presentes no estudo do ambiente sonoro e na relação da comunidade com ele. A partir dessa revisão foi possível estabelecer os sons que caracterizam a paisagem sonora da Igreja e verificar se a comunidade se sente afetada por eles, ou não. Trata-se de uma pesquisa de caráter qualitativo e reflexivo que, além de se basear em diversos autores selecionados, fundamenta-se no Pensamento Sistêmico, segundo o define FRITZJOF CAPRA (2004). A Metodologia utilizada é diferenciada para cada segmento da investigação, amparando-se na definição de método dada por RICHARDSON (1999). Para levantamento dos dados, no segundo capítulo, é utilizada a técnica de observação não-particpante; no terceiro capítulo, emprega-se a técnica de observação participante; e no último capítulo, a técnica de seminário, definida por THIOLLENT (2002). Da observação e análise do espaço sonoro da Igreja, pelo pesquisador e pela comunidade, e o conseqüente levantamento das características dessa paisagem sonora e seus problemas, surgiu a necessidade da realização de um seminário, no qual as questões foram discutidas e soluções apontadas, pela comunidade presente. A partir dos resultados obtidos desenvolveu-se uma reflexão, baseada nos quatro princípios de SCHAFER para os caminhos de um projeto acústico, a saber: respeito pelo ouvido e pela voz; consciência do simbolismo sonoro; conhecimento dos ritmos e tempos da paisagem sonora natural; compreensão do mecanismo de equilíbrio pelo qual uma paisagem sonora...<br>The main objectives of this research are to diagnostics the acoustic environment of the Baptist Church in Jardim Utinga und to undestand the way the members relate to this acoust space. To do this, the literature related to the sound environment is revised - Ecology Acoustic in interface whith the Environment Education aiming at understanding the different dimensions: social, cultural and economic present in the study of the acoustic environment and in the relationship of the community with it. Taking this revision into account, it was possible to establish the sounds that characterize the church soundscape and to check if the community feels affected by them or not. This is a qualitative and reflexive research which, beyond the mentioned authors, is built on the Sistemic Thought, according to the Fritzjof Capra's definition (2004). The methodology is diferent for each segment of the investigation, based on the definition on the method given for Richardson (1999).Thus, for survey of the data, the not-participant observation technique is usedin the second chapter, the participant observation techinique is used in the third chapter and the seminary thechnique defined for Thiollent(2002) in the last chapter. From the observation and analysis made by the researcher and the community about the acoustic space of the church, and the consequent survey of the characteristics of this soudscape and its problems, the necsssity of the seminary taking place apperead, when questions were discussed and solutionswere pointed by the present community. From the results, a reflexion was developed, based on the fous principles of SCHAFER to the ways of an acoustic project, such as: respect for the natural soundscape; understanding of the mechanism of balance for which an unbalanced ... (Complete abstract, access electronic address below)
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Bagley, Phil. "Investigations of the behaviour of demersal grenadier fish, Coryphaenoides (Nematonurus) armatus in the abyssal Pacific and Atlantic oceans using an autonomous acoustic tracking vehicle." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU049186.

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The deep-sea has long been perceived as a food limited environment. The recent discovery of seasonal inputs of organic matter into the deep, in areas of the North Pacific and North Atlantic Oceans, has led to questions about the behaviour of deep-sea demersal animals. This thesis describes an autonomous acoustic tracking system (AUDOS: Aberdeen University Deep Ocean Submersible) developed to address the behaviour question; primarily of the demersal grenadier fish, <i>Coryphaenoides (Nematonurus) armatus</i>, but also other shallower living species. Deep-sea acoustic pinger and Code Activated Transponder (CAT) ingestible fish tags, capable of operating at depths of 600m, are described. Deep-sea pingers operated with an early version of AUDOS, returning directional information on fish which ingested tags. The CAT, which is acoustically interrogated by a scanning sonar mounted on AUDOS, returns precise direction and range of individually tagged fish. AUDOS is an autonomous free-fall vehicle incorporating a microprocessor based logging unit which also controls a camera, current meter and compass, enabling several tagged fish to be individually located within a 500m radius. On-board environmental monitoring allows relationships between fish movements and the localised current to be addressed. Three locations were visited during 5 research cruises, Station M (32<SUP>o</SUP>50'N, 122<SUP>o</SUP>50'W) in the North Pacific Ocean, station MAP (29<SUP>o</SUP>30'N, 21<SUP>o</SUP>16'W) in the North Atlantic Ocean and the Porcupine Seabight area (51<SUP>o</SUP>20'N, 14<SUP>o</SUP>0'W) also in the North Atlantic Ocean. Tracking results indicate that <i>C. (N.) armatus</i> adopt an active foraging strategy at each of these stations. Evidence was found for a faster mean swimming speed, for the grenadier, in October (0.0692 m.s<SUP>-1</SUP>) compared to February (0.0262 m.s<SUP>-1</SUP>) at station M. Fish activity is elevated in October following a seasonal enrichment of the benthos by downward flux of particulate organic matter from the surface. At the Continental slope region of the Porcupine Seabight, the grenadier was found to be moving up the slope rather than directly using the current to forage for food (Station MAP).
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Mutavhatsindi, Itani Victor. "The influence of foraging habitat on acoustic signal source levels in two bat species, Neoromicia capensis (Vespertilionidae) and Tadarida aegyptiaca (Molossidae)." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/28084.

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The source level of echolocation pulses is an essential parameter because it has an impact on the range at which bats perceive their environment and, most importantly, at which they detect prey. Echolocation pulse source level is under the control of the echolocator and its operational range is likely to vary with body size and foraging habitat because these determine the operational range needed by the bat. This study thus attempted to answer the following questions; (1) is the source levels of animal acoustic signals different in different situations? (2) Does body size and foraging habitat affect the source levels of animal acoustic signals? There are only a few studies that report on the source levels of echolocation pulses of free-ranging bats because of the difficulty of measuring the distance of the bat from the recording microphone. This distance is essential in calculating source levels of echolocation pulses. I used multiple microphone array system to investigate the echolocation sound signals, three-dimensional (3-D) acoustic flight paths and source levels of echolocation pulses at 10 cm standard reference distance from the mouth of a free-flying frequency-modulated (FM) bat, Neoromicia capensis and quasi-constant frequency (QCF) bat, Tadarida aegyptiaca. The two bat species differ in body size and foraging habitat. I found as predicted, that T. aegyptiaca, the larger of the two species and an open-air aerial hawker, emitted echolocation pulses of higher source levels and therefore had greater maximum detection distances than the smaller, clutter-edge aerial hawker, N. capensis. Tadarida aegyptiaca emitted echolocation pulses with an average of 146.9±4.6 (range 137.7 - 154.8) dB peSPL during emergence from the roost and an average of 143.0±4.9 (range 136.4 - 153.3) dB peSPL during foraging, extending the known range of free-flying bats. Neoromicia capensis emitted echolocation pulses with an average of 129.3±4.0 (range 119.3 - 138.7) dB peSPL during emergence from the roost and average of 132.8±5.0 (range 117.8 - 142.9) dB peSPL during foraging. As anticipated, I found N. capensis to be emitting echolocation pulses of higher source levels during foraging than when it emerged from the roost. However, there was no significant difference in the source levels of T. aegyptiaca between emergence from the roost and foraging habitat. The estimated maximum detection distances for the three insect size categories i.e. small, medium and large was greater for T. aegyptiaca than N. capensis. My data therefore suggests that bats might adjust their echolocation pulse source levels to suit their foraging habitat and situation.
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11

Risch, Denise [Verfasser]. "Baleen whale acoustic ecology with focus on minke whales (Balaenoptera acutorostrata) and reference to anthropogenic noise / Denise Risch." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1062535995/34.

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Reed, Veronica Arlene. "Natural and Experimental Noise Affects Acoustic Communication in Songbirds." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2279.

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Background noise is ubiquitous and can impair acoustic communication and influence signaling behavior in animals. Despite evidence demonstrating myriad effects of anthropogenic noise on animal communication, precisely how natural background noise influences communication and behavior remains unclear. Yet, natural sources of background noise, such as rushing rivers or crashing ocean surf, share similar power spectra to sources of anthropogenic noise and can occur at high amplitudes, potentially masking acoustic signals. To investigate the effects of water-generated noise on songbird behavior, we experimentally broadcast landscape-level playbacks of ocean surf and river noise in coastal California, USA, and riparian habitat in Idaho, USA, respectively. In Chapter 1, we conducted a conspecific playback experiment examining how territorial defense behaviors of lazuli buntings (Passerina amoena) and spotted towhees (Pipilo maculatus) vary in response to broadcast water noise. We also incorporated cicada noise from a serendipitous Okanagana spp. emergence as a biotic source influencing lazuli bunting behavior. Both species produce songs that share substantial spectral overlap with low-frequency, water-generated noise, and lazuli bunting song shares an additional high-frequency overlap with cicada calls. Thus, there is potential for background acoustic conditions to mask conspecific signals. We found that detection and discrimination of conspecific playback occurred more slowly for both species as sound level increased. Lazuli buntings also exhibited divergent flight behaviors in response to high- and low-frequency acoustic sources, both dependent and independent of sound level. In Chapter 2, we investigated how amplitude and frequency of water-generated noise influences spectral and temporal song characteristics in six songbird species. We recorded individuals defending territories across 37 sites, with each site representing one of four acoustic environments: naturally quiet ‘controls’, naturally noisy ‘positive controls’ adjacent to the ocean or a whitewater river, ‘phantom’ playback sites with continuous broadcast of low-frequency water noise, and ‘shifted’ playback sites with continuous broadcast of high-frequency water noise. We predicted that all individuals exposed to ‘positive control’, ‘phantom’, or ‘shifted’ noise would adjust song structure, but the magnitude of signal modification would be larger in noisier locations and the type of modification would depend on the spectral profile of the acoustic environment. No two species altered songs in precisely the same way. However, song structure of all six species varied with amplitude and/or frequency of background noise. Together our results demonstrate that natural noise can impair agonistic behaviors and influence vocal structure. These findings suggest that the natural acoustic environment shapes acoustic communication, highlighting natural soundscapes as an under-appreciated axis of the environment.
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Sathyan, Rekha. "Intra- and inter-population variation in the bladder grasshopper Bullacris unicolor." University of the Western Cape, 2014. http://hdl.handle.net/11394/8215.

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Masters of Science<br>Although the processes that promote biodiversity and speciation remain poorly understood, ecological factors are thought to be one of the causal agents responsible for promoting variation. Bladder grasshoppers (Orthoptera; Pneumoroidea) are a group of endemic southern African insects that provide an ideal model system to study the role of ecology in speciation. All species rely on acoustic communication for mate location, with males producing an extremely loud advertisement call that is highly species specific. Any alteration to the male call would thus likely have implications for species integrity. In this study, I examined geographic variation as well as potential ecological drivers of biological diversity within Bullacris unicolor, a variable and wide-ranging species of bladder grasshopper. The main aims of the study were to characterise the extent of acoustic and morphological variation among individuals sampled from five geographic locations and to correlate this variation with environmental data and host plant use. At the inter-population level, I found significant differences between populations with respect to both morphological and acoustic characters. Results of multivariate analyses showed significant differences in the body length, pronotum length and head width of males and in the pronotum length, abdomen width and head width of females. Similarly, the acoustic signals of males from the five populations differed significantly in both temporal and frequency components, with all but one variable (peak frequency of the introductory syllables) showing a significant difference. However, there was no correlation between morphological and acoustic variables among populations, and acoustic characters showed far greater divergence among populations than did morphology. In both males and females, the morphological variables that differed among populations were negatively correlated with mean annual temperature, indicating that grasshoppers are larger in areas with lower temperatures. Also, some of the call characteristics of males were correlated with temperature, precipitation, altitude, and slope. Although grasshoppers were observed feeding on a range of host plant species, neither morphology nor signal characteristics were found to vary according to host plant. At the intra-population level, multivariate analyses revealed that all acoustic characters differed significantly among individuals. Morphology may be influencing signal properties within a population to some extent as there were significant correlations between some of the call characters and both abdomen width and tibia length, with lengths of these two morphological variables being positively correlated with temporal components of the call and abdomen width being negatively correlated with frequency components. I also found a significant difference in the carrier frequency of male calls, as well as in some of the morphological characters of males and females, according to host plant. This indicates that host plant use has a greater effect on variation at the intra-population level than at the interpopulation level. In conclusion, the results of my study reveal significant variation in the morphology and acoustic signals of B. unicolor, both within and among populations, and suggest that this variation is at least partially related to ecological factors.
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Sage, Rebecca Michelle Sorensen. "Acoustic sexual communication in the house cricket (Acheta domesticus): Effects of female choice and intermale competition on male calling song." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282624.

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This dissertation reports on a study conducted to examine the morphological, behavioral, and environmental sources of variation in the structure of house cricket, Acheta domesticus, calling song. Song variations may be important in female mating decisions and influence male mating success. Eleven song parameters were measured: chirp duration, interchirp duration, syllable number, syllable duration, intersyllable duration, mean frequency, frequency intensity, minimum frequency, maximum frequency, syllable intensity, and intensity difference between syllable and frequency intensity. Morphological factors examined included body: mass, length, color, asymmetry, intactness; and male age. Behavioral factors were timing of song bouts and proclivity to sing. Environmental conditions of high population densities were simulated by temporarily placing males into an arena with three other males. The calling song structure of tactilely isolated males resulted in three factors: frequency (mean, minimum, and maximum frequencies); intensity (syllable intensity, and intensity difference); and variability (difference between syllable intensity and frequency intensity). Males with high body intactness sang at lower frequencies. Asymmetrical males sang more intense songs. Large males sang with more intensity and frequency variability. Intermale competitions resulted in distinguishable linear dominance hierarchies. Lower-ranking males sang less often than higher-ranking males, altered singing times, and sang quieter songs. Intermale competition resulted in males altering song structure. Analysis of post-competitive songs resulted in three factors: frequency (mean and maximum frequencies, and intensity difference); energy (duty-cycle, intensity, and minimum frequency) and variability (unchanged). Higher-ranking asymmetrical males sang at lower frequencies. Higher-ranking males sang with greater energy, and timed their singing to female receptive times. Higher-ranking, large, intact males sang with less variability. This study indicated that A. domesticus males signal phenotypic information via their calling song characteristics. More specifically, in low population densities males signal information concerning their fitness-related qualities. After having established dominance orders, the male signal information concerning their rank in conjunction with fitness. The implications of this study were that intermale competition altered the song cues available to the females and may alter female mating decisions.
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15

Miguel, Fábio. "Entre ouvires : a paisagem sonora da Igreja Batista em Jardim Utinga em foco /." São Paulo : [s.n.], 2006. http://hdl.handle.net/11449/95110.

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Orientador: Marisa Trench de Oliveira Fonterrada<br>Resumo: Esta pesquisa tem como objetivos principais diagnosticar o ambiente sonoro da Igreja Batista em Jardim Utinga e compreender de que maneira os membros se relacionam com este espaço acústico. Para isso, revisa-se a literatura da área de som ambiental Ecologia Acústica em interface com a Educação Ambiental, para entendimento das diferentes dimensões: sociais, culturais e econômicas presentes no estudo do ambiente sonoro e na relação da comunidade com ele. A partir dessa revisão foi possível estabelecer os sons que caracterizam a paisagem sonora da Igreja e verificar se a comunidade se sente afetada por eles, ou não. Trata-se de uma pesquisa de caráter qualitativo e reflexivo que, além de se basear em diversos autores selecionados, fundamenta-se no Pensamento Sistêmico, segundo o define FRITZJOF CAPRA (2004). A Metodologia utilizada é diferenciada para cada segmento da investigação, amparando-se na definição de método dada por RICHARDSON (1999). Para levantamento dos dados, no segundo capítulo, é utilizada a técnica de observação não-particpante; no terceiro capítulo, emprega-se a técnica de observação participante; e no último capítulo, a técnica de seminário, definida por THIOLLENT (2002). Da observação e análise do espaço sonoro da Igreja, pelo pesquisador e pela comunidade, e o conseqüente levantamento das características dessa paisagem sonora e seus problemas, surgiu a necessidade da realização de um seminário, no qual as questões foram discutidas e soluções apontadas, pela comunidade presente. A partir dos resultados obtidos desenvolveu-se uma reflexão, baseada nos quatro princípios de SCHAFER para os caminhos de um projeto acústico, a saber: respeito pelo ouvido e pela voz; consciência do simbolismo sonoro; conhecimento dos ritmos e tempos da paisagem sonora natural; compreensão do mecanismo de equilíbrio pelo qual uma paisagem sonora...(Resumo completo, clicar acesso eletrônico abaixo)<br>Abstract: The main objectives of this research are to diagnostics the acoustic environment of the Baptist Church in Jardim Utinga und to undestand the way the members relate to this acoust space. To do this, the literature related to the sound environment is revised - Ecology Acoustic in interface whith the Environment Education aiming at understanding the different dimensions: social, cultural and economic present in the study of the acoustic environment and in the relationship of the community with it. Taking this revision into account, it was possible to establish the sounds that characterize the church soundscape and to check if the community feels affected by them or not. This is a qualitative and reflexive research which, beyond the mentioned authors, is built on the Sistemic Thought, according to the Fritzjof Capra's definition (2004). The methodology is diferent for each segment of the investigation, based on the definition on the method given for Richardson (1999).Thus, for survey of the data, the not-participant observation technique is usedin the second chapter, the participant observation techinique is used in the third chapter and the seminary thechnique defined for Thiollent(2002) in the last chapter. From the observation and analysis made by the researcher and the community about the acoustic space of the church, and the consequent survey of the characteristics of this soudscape and its problems, the necsssity of the seminary taking place apperead, when questions were discussed and solutionswere pointed by the present community. From the results, a reflexion was developed, based on the fous principles of SCHAFER to the ways of an acoustic project, such as: respect for the natural soundscape; understanding of the mechanism of balance for which an unbalanced ... (Complete abstract, access electronic address below)<br>Mestre
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16

Janos, Gregg A. "Utilizing Acoustic Methods to Identify Bat Species, and to Assess Their Habitat Use and Perception of Owls." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1363428258.

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17

Zenone, Adam M. "A Comparative Study of Concurrent Acoustic and Diver Survey Data, and Fish Community Descriptions of a High Latitude Coral Reef, Florida, USA." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/1855.

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Fisheries independent data on relatively unstudied nekton communities were used to explore the efficacy of new tools to be applied in the investigation of shallow coastal coral reef habitats. These data obtained through concurrent diver visual and acoustic surveys provided descriptions of spatial community distribution patterns across seasonal temporal scales in a previously undocumented region. Fish density estimates by both diver and acoustic methodologies showed a general agreement in ability to detect distributional patterns across reef tracts, though magnitude of density estimates were different. Fish communities in southeastern Florida showed significant trends in spatial distribution and seasonal abundance, with higher estimates of biomass obtained in the dry season. Further, community composition shifted across reef tracts and seasons as a function of the movements of several key reef species.
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18

Kasprzyk, Cory Ryan. "Found Composition: Ecological Awareness and its Impact on Compositional Authority in Music Employing Electronics." Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510572689037113.

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19

Martin, Brona Colette. "Portfolio of original compositions." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/portfolio-of-original-compositions(7253d29c-0bbc-45f1-acc2-65acd0041ff0).html.

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Electroacoustic music has a unique ability to connect the listener to places, space and stories both real and imaginary. Each work within the portfolio explores specific objects, spaces and places. The intrinsic sonic qualities are explored and a musical narrative takes the listener through a newly composed imaginary space. Six original compositions are presented in this portfolio. The titles of these works are as follows: Lamenting, 192, All Along the Bell Tower, Oz, The Thing About Listening is…. and A Bit Closer to Home. Narrative structures that simulate a journey are used as a guide for the listener through immersive, virtual soundworlds. These spoken word and musical narratives also serve as a structural tool for the composer. Imagined and real sonic layers within stories and soundscapes are analysed, deconstructed and manipulated. These works convey a message, story or sense of place to the listener, while revealing sonic qualities that are not normally the focus of listening. My aim as a composer is to enhance the daily listening experiences of the listener, as they become more aware and appreciative of the sounds around them, through the sounds and spaces they experience in my music.
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SANTOS, Gabriel Melo Alves dos. "Acoustic ecology of dolphins of the genus Sotalia (Cetartiodactyla, Delphinidae) and of the newly described Araguaian boto Inia araguaiaensis (Cetartiodactyla, Iniidae)." Universidade Federal do Pará, 2018. http://repositorio.ufpa.br/jspui/handle/2011/10478.

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Submitted by Andreza Leão (andrezaflh@gmail.com) on 2018-08-31T17:32:01Z No. of bitstreams: 1 Tese_AcousticEcologyDolphins.pdf: 3257688 bytes, checksum: 4841865b7154c6248dc60c31219f8055 (MD5)<br>Approved for entry into archive by Celia Santana (celiasantana@ufpa.br) on 2018-12-12T18:02:31Z (GMT) No. of bitstreams: 1 Tese_AcousticEcologyDolphins.pdf: 3257688 bytes, checksum: 4841865b7154c6248dc60c31219f8055 (MD5)<br>Made available in DSpace on 2018-12-12T18:02:31Z (GMT). No. of bitstreams: 1 Tese_AcousticEcologyDolphins.pdf: 3257688 bytes, checksum: 4841865b7154c6248dc60c31219f8055 (MD5) Previous issue date: 2018-03-09<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Sistemas sensoriais são vitais para que os animais obtenham informações sobre seus arredores. A informação pode ser adquirida por vias visuais, químicas, elétricas, táteis e acústicas. Estes sinais são usados em diferentes contextos ecológicos incluindo forrageamento, competição, defesa, interações sociais (e.g. corte), e também podem indicar uma condição, e estado emocional ou reprodutivo, ou a identidade do emissor do sinal. Para os mamíferos aquáticos o som é o meio de comunicação mais importante. A luz atenua rapidamente com a profundidade em ambientes aquáticos, limitando a comunicação visual. Todavia, a atenuação do som na água é baixa e ele viaja cerca de cinco vezes mais rápido na água do que no ar, o que o torna um meio de comunicação extremamente eficiente em baixo da água. Logo, o som é um aspecto fundamental da biologia dos cetáceos, já que estes animais dependem do som para comunicação, navegação e localização de presas. O gênero Sotalia compreende duas espécies que vivem em hábitats contratantes. O botocinza (Sotalia guianensis) que habita águas costeiras da Nicarágua ao sul do Brasil, e o tucuxi (Sotalia fluviatilis) restrito aos principais tributários da Bacia Amazônica. Enquanto que golfinhos do gênero Inia – popularmente conhecidos como botos-vermelhos – são encontrados exclusivamente nas Bacias dos rios Amazonas, Orinoco e Tocantins. Com ambos os seus estados de conservação como dados deficientes há grande demanda de informações quanto a sua biologia. Como fator-chave da biologia dos cetáceos a acústica pode nos prover uma riqueza de informações e ser usada como ferramenta para adquirir dados quanto ao uso de hábitat, números populacionais e comportamento. Entretanto, para fazê-lo, primeiro é necessário conhecer o repertório vocal das espécies em detalhe de forma que possamos diferenciá-las usando métodos acústicos. Portanto apresentamos aqui a primeira análise englobando toda a distribuição de golfinhos do gênero Sotalia e padrões geográficos e de diversidade de seus assobios. Além disso, apresentamos a primeira descrição do repertório vocal e de Inia araguaiensis focando na diversidade de repertório e em sua estrutura. O repertório de assobios de ambas as espécies de Sotalia é altamente estruturado, com populações da espécie fluvial apresentando um repertório menos diverso do que as populações da espécie costeira. Esta estruturação se dá provavelmente devido a áreas de vida pequenas e ao baixo fluxo gênico entre populações. As diferenças na riqueza entre o repertório destas espécies parecem estar relacionadas a uma combinação de fatores socio-ecológicos e evolutivos. Também apresentamos a primeira descrição do comportamento acústico do boto-o Araguaia (Inia araguaiaensis) e mostramos que eles possuem um repertório rico composto por assobios e principalmente chamados pulsados. Assobios foram produzidos raramente, um tipo específico de chamado, chamados curtos com dois componentes, foram o tipo de sinal mais comum durante nosso estudo. Estes chamados são similares em estrutura a aqueles produzidos por orcas (Orcinus orca) e baleias-piloto (Globicephala sp.). Devido ao contexto no qual estes sinais foram produzidos, nós hipotetizamos que eles podem funcionar para a comunicação ente mãe e filhote. Sotalia e Inia podem ser distintos acusticamente baseados em seus sons sociais, já que o primeiro tem um repertório baseado em assobios e o último em chamados pulsados. A baixa emissão de assobios por Inia faz com que a chance de identificação errônea seja baixa. Logo, sons 14 de ambos os gêneros podem ser usados para distingui-los durante monitoramentos acústicos passivos e podem servir como ferramentas para determinar a presença destas espécies em estudos de distribuição, uso de hábitat e abundância.<br>Sensory systems are vital for animals to obtain information about their surroundings. Information can be gathered via visual, chemical, electrical, tactile and acoustic cues. These cues are used in several ecological contexts including foraging, competition, defense, social interactions (e.g. courtship behavior), and to indicate a condition, emotional or reproductive state or identity of the signal emitter. For aquatic mammals, sound is the most important mechanism of communication. Light attenuates rapidly with depth in aquatic environments limiting visual communication. In contrast, sound has low attenuation in water and it travels about five times faster in water than in air, making a very efficient way to communicate underwater. Therefore, sound is a fundamental aspect of cetacean biology, as these animals rely on acoustic signals for communication, navigation and location of prey. The genus Sotalia consist of two species that inhabit contrasting habitats. The Guiana dolphin (Sotalia guianensis) inhabits the coastal waters from Nicaragua to Southern Brazil, and the tucuxi (Sotalia fluviatilis) is confined to the main tributaries of the Amazon Basin. Meanwhile, river dolphins of the genus Inia - commonly known as botos - are found exclusively in the Amazon, Orinoco, and Tocantins River Basins. With their conservation status of both genera as data deficient there is great demand for information on their biology. As a key factor on cetacean biology acoustics can provide us with a richness of information and used as a tool to acquire data on habitat use, population numbers and behavior. However, in order to do so, first one needs to know the species vocal repertoire in detail and be able to differentiate those using acoustic methods. Thus, here we present the first distributionwide analysis of the vocal repertoire of Sotalia dolphins and diversity and geographical patterns of their whistles. In addition, we present the first description of the vocal repertoire of Inia araguaiaensis focusing on repertoire diversity and structure. The whistle repertoire of both Sotalia species is highly structured, with populations of the riverine species showing a less diverse whistle repertoire than the populations of the coastal species. The highly structured repertoire is likely due to the small home ranges and low gene flow among populations. Differences in the richness of the acoustic repertoire between both species, may be due to a combination of socioecological and evolutionary factors. We also provide the first description of the Araguaian boto (Inia araguaiensis) acoustic behavior and showed that they have a rich acoustic repertoire consisting of whistles and primarily pulsed calls. While whistles were produced rarely, a specific type of call, the short two-component calls were the most common signal emitted during the study. These calls were similar in acoustic structure to those produced by orcas (Orcinus orca) and pilot whales (Globicephala sp.). Because of the context at which these signals were produced, we hypothesize that they possibly play a role in mother-calf communication. Sotalia and Inia can be acoustically distinguished based on their social sounds, as the former has a repertoire based on whistles and the latter based on pulsative calls. With the low emission rate of whistles by Inia, so chances of misidentification are low. Thus, sounds of both genera can be used to distinguish them from one another during passive acoustic monitoring and serve as proxies for species presence in studies of distribution, habitat use, and abundance.
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21

Lynam, Christopher Philip. "Ecological and acoustic investigations of jellyfish (Scyphozoa and Hydrozoa)." Thesis, St Andrews, 2006. https://research-repository.st-andrews.ac.uk/handle/10023/466.

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22

Balantic, Cathleen Michelle. "Tools for landscape-scale automated acoustic monitoring to characterize wildlife occurrence dynamics." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/980.

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In a world confronting climate change and rapidly shifting land uses, effective methods for monitoring natural resources are critical to support scientifically-informed management decisions. By taking audio recordings of the environment, scientists can acquire presence-absence data to characterize populations of sound-producing wildlife over time and across vast spatial scales. Remote acoustic monitoring presents new challenges, however: monitoring programs are often constrained in the total time they can record, automated detection algorithms typically produce a prohibitive number of detection mistakes, and there is no streamlined framework for moving from raw acoustic data to models of wildlife occurrence dynamics. In partnership with a proof-of-concept field study in the U.S Bureau of Land Management’s Riverside East Solar Energy Zone in southern California, this dissertation introduces a new R software package, AMMonitor, alongside a novel body of work: 1) temporally-adaptive acoustic sampling to maximize the detection probabilities of target species despite recording constraints, 2) values-driven statistical learning tools for template-based automated detection of target species, and 3) methods supporting the construction of dynamic species occurrence models from automated acoustic detection data. Unifying these methods with streamlined data management, the AMMonitor software package supports the tracking of species occurrence, colonization, and extinction patterns through time, introducing the potential to perform adaptive management at landscape scales.
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23

Richard, Gaëtan. "Behavioural ecology of fishermen and odontocetes in a depredation context." Thesis, La Rochelle, 2018. http://www.theses.fr/2018LAROS018/document.

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De nombreux prédateurs marins se nourrissent directement des prises des pêcheurs. Ces interactions, définies comme de la déprédation, engendrent des conséquences socio-économiques considérables pour les pêcheurs ainsi que des implications de conservation pour la faune sauvage. D’un côté, la déprédation endommage le matériel et augmente l’effort de pêche pour atteindre les quotas. D’un autre côté, la déprédation augmente le risque de mortalité des prédateurs marins (prise accidentelle ou rétorsion létale par les pécheurs). La pêcherie à la palangre est la plus impactée par la déprédation, principalement par les odontocètes, ce qui incite à trouver des solutions. La majorité des études se concentrant sur la déprédation s’est principalement basée sur des observations en surface, de ce fait la manière dont les prédateurs retirent les poissons sur les lignes reste confuse. Par ailleurs, l’impact de la déprédation sur le comportement des pêcheurs ainsi que les facteurs expliquant leur détectabilité n’ont reçu que peu d’intérêt. L’objectif de cette thèse est donc d’étudier ces problématiques par un suivi acoustique, une utilisation de balises et une approche en écologie comportementale humaine, en se concentrant sur la pêcherie palangrière française ciblant la légine australe (Dissostichus eleginoides) impactée par la déprédation des orques (Orcinus orca) et des cachalots (Physeter macrocephalus). Les capitaines ont été décrits comme recherchant leur ressource selon la théorie de « l’optimal foraging », mais avec des perceptions de la compétition et du succès de pêche qui divergent. Certains capitaines seraient ainsi plus enclins à remonter les palangres au plus proche et à rester sur une zone, même en présence de compétition, augmentant alors le risque d’interaction. L’acoustique des navires a révélé que certaines manoeuvres (marche arrière par exemple) propagent différemment sous l’eau. La manière dont les capitaines manoeuvrent leur palangrier influencerait ainsi leur détectabilité et donc leur risque d’interaction avec les prédateurs. D’autre part, l’utilisation de capteurs sur les palangres et les animaux a révélé que les orques et les cachalots sont capables de déprédater sur les palangres posées sur le fond marin. Ces observations laissent à penser que les odontocètes sont en mesure de localiser l’activité de pêche bien avant la remontée de la ligne, ce qui pourrait être expliqué par une signature acoustique spécifique du déploiement de la ligne. L’ensemble des résultats de cette thèse suggère que la déprédation sur les palangres démersales est très probablement sous-estimée. Cette thèse apporte également des éléments importants pour la lutte contre la déprédation, en montrant la nécessité de protéger les palangres dans l’intégralité du processus de pêche<br>Many marine predator species feed on fish caught by fishers directly from the fishing gear. Known as depredation this interaction issue has substantial socio-economic consequences for fishermen and conservation implications for the wildlife. Costs for fishers include damages to the fishing gear and increased fishing effort to complete quotas. For marine predators, depredation increases risks of mortality (lethal retaliation from fishers or bycatch on the gear). Longline fisheries are the most impacted worldwide, primarily by odontocetes (toothed whales) depredation, urging the need for mitigation solutions to be developed. Most of studies assessing depredation have primarily relied on surface observation data, thus the way odontocetes interact with longlines underwater remains unclear. Besides, the way fishermen respond to depredation during fishing operations, or can influence their detectability to odontocetes, have been poorly investigated. This thesis therefore aimed at investigating these aspects through a passive acoustic monitoring, bio-logging and human ecology approaches, focusing on the French Patagonian toothfish (Dissostichus eleginoides) longline fisheries impacted by killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus). Firstly, this thesis reveals that captains behave as optimal foragers but with different personal perception of competition and fishing fulfilment. Some captains would thus be more likely to stay within a patch or to haul closest longline even in presence of competition, suggesting these captains would show higher interaction rates. Additionally, the propagation of vessels’ acoustics varied depending on the type of manoeuvre (e.g. going backward vs. forward). The way captains use their vessels to navigate may therefore influence their detectability and so their depredation level. Secondly, loggers deployed on both the longlines (accelerometers) and odontocetes (GPS-TDR) revealed that killer whales and sperm whales are able to depredate on longlines while soaking on the seafloor. These observations suggest, therefore, that odontocetes can localise fishing activity before the hauling, which could be partially explained by specific acoustic signatures recorded during the setting process. Altogether, the results of the thesis suggest that depredation rates on demersal longlines are most likely underestimated. The thesis also brings some important insights for mitigation measures, suggesting that countermeasures should start from setting to hauling
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24

Langkau, Manuel [Verfasser], Jost [Gutachter] Borcherding, and Hartmut [Gutachter] Arndt. "Echoes in motion: An acoustic camera (DIDSON) as a monitoring tool in applied freshwater ecology / Manuel Langkau ; Gutachter: Jost Borcherding, Hartmut Arndt." Köln : Universitäts- und Stadtbibliothek Köln, 2018. http://d-nb.info/1161531726/34.

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25

Kimura, Satoko. "Application of passive acoustic methods for the ecology and conservation of small odontocetes: A case of finless porpoise in the Yangtze River." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142124.

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26

Rosenblatt, Adam. "Factors Influencing Movements and Foraging Ecology of American Alligators (Alligator mississippiensis) in a Dynamic Subtropical Coastal Ecosystem." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/900.

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Top predators can have large effects on community and population dynamics but we still know relatively little about their roles in ecosystems and which biotic and abiotic factors potentially affect their behavioral patterns. Understanding the roles played by top predators is a pressing issue because many top predator populations around the world are declining rapidly yet we do not fully understand what the consequences of their potential extirpation could be for ecosystem structure and function. In addition, individual behavioral specialization is commonplace across many taxa, but studies of its prevalence, causes, and consequences in top predator populations are lacking. In this dissertation I investigated the movement, feeding patterns, and drivers and implications of individual specialization in an American alligator (Alligator mississippiensis) population inhabiting a dynamic subtropical estuary. I found that alligator movement and feeding behaviors in this population were largely regulated by a combination of biotic and abiotic factors that varied seasonally. I also found that the population consisted of individuals that displayed an extremely wide range of movement and feeding behaviors, indicating that individual specialization is potentially an important determinant of the varied roles of alligators in ecosystems. Ultimately, I found that assuming top predator populations consist of individuals that all behave in similar ways in terms of their feeding, movements, and potential roles in ecosystems is likely incorrect. As climate change and ecosystem restoration and conservation activities continue to affect top predator populations worldwide, individuals will likely respond in different and possibly unexpected ways.
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Turner, Tyler Norman. "Effects of Human Land Use on the Activity, Diversity, and Distribution of Native Bats." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522839181353869.

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Klinck, Holger [Verfasser]. "Automated passive acoustic detection, localization and identification of leopard seals: from hydro-acoustic technology to leopard seal ecology = Automatisierte, passiv-akustische Detektion, Lokalisation und Identifikation von Seeleoparden : Von hydro-akustischer Technologie zur Ökologie des Seeleoparden / Holger Klinck." Bremerhaven : AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung, 2008. http://d-nb.info/1010122274/34.

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29

Stampe, Elin. "Sonar Sea : The acoustic experience of the Baltic Sea dynamics." Thesis, Konstfack, Inredningsarkitektur & Möbeldesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7830.

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This thesis project aims to discuss the conditions and importance of water as a dynamic body in our environment, as water is affecting life on Earth on all levels. By focusing on the Baltic Sea, a sensitive body of water, I am exploring the acoustic characters of the sea dynamics through sound recordings at three bays in the Stockholm Archipelago. How can an acoustic exploration of the Baltic Sea dynamics mediate a sensitive relationship to our marine environments? Sound defines environments and gives indications of their current state. In this project, I intertwine an artistic approach involving our senses with scientific research of measuring to further an understanding of the relationship between humans and nature. The project explores water and sound in two parts, first as a method for listening to the sea, second as a spatial composition created for a sensory experience of the sea’s endless motion. It is my hope that my installation can stir emotions and create an understanding for the environmental challenges facing the Baltic Sea and inspire action towards prosperous natural environments where we live with and not apart from nature.
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Habellion, Dominique. "L'objet-exposition "Sonolithe" de Louis Dandrel (1991) : un outil pédagogique patrimonial d'éducation à l'écoute en lien avec l'écologie sonore." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0105/document.

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Louis Dandrel, né en 1939, est musicien, compositeur et designer sonore. En 1991, il conçoit pour le grand public une « exposition de sons » intitulée « Sonolithe ». Son objectif est de faire évoluer les représentations et les rapports que l’individu peut avoir avec son environnement sonore. Après avoir fait traduire en français le célèbre ouvrage de R. Murray Schafer Le paysage sonore (1979), Louis Dandrel préface la seconde édition de 2010. Dans de nombreuses interviews et conférences il réaffirme l’influence décisive de Murray Schafer sur son travail. Partant de ce double constat qui devient une double hypothèse, à la fois pédagogique et musicologique, cette recherche tente d’abord de déterminer dans quelle mesure l’objet-exposition « Sonolithe » peut s’intégrer au cadre théorique de l’ « écologie sonore » tel qu’il est défini par R. Murray Schafer et ses successeurs. Dans un second temps, à partir de l’orientation pédagogique souhaitée par Louis Dandrel, cette étude examine l’objet-exposition comme un dispositif didactique possible<br>Louis Dandrel was born in 1939. He is a musician, a composer and a sound designer. In 1991, he imagined a « sound exhibition » for the general public entitled « Sonolithe » in order to make people’s perceptions of the sound environment evolve. After being one actor of the translation of R. Murray Schafer’s famous book The soundscape (1979), Louis Dandrel wrote the preface of the second edition in 2010. In many interviews and conferences he reaffirms the decisive influence of Murray Schafer on his work. This thesis is based upon a double statement which becomes a double hypothesis, both musicological and pedagogical, so as to try and determine to what extent the exhibition-object « Sonolithe » can be integrated into an « acoustic ecology » theoretical framework, as defined by R. Murray Schafer and his followers. Secondly, this thesis tries to examine the exhibition-object as part of a possible didactical system, building on Louis Dandrel’s pedagogical positioning
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Sugai, Larissa Sayuri Moreira. "A acústica como dimensão de comunidades ecológicas e instrumento para o monitoramento da biodiversidade /." Rio Claro, 2019. http://hdl.handle.net/11449/191329.

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Orientador: Tadeu Siqueira<br>Resumo: A natureza é ruidosa. Passarinhos gorjeiam enquanto o vento silva ao pentear os campos com abelhas e seus zunzuns rondando flores. Desatentos, deixamos de notar uma incrível quantidade de elementos retumbando em nosso entorno. No entanto, cada som parte de uma fonte, deixando uma pista sobre a situação na qual foi produzido. Podemos identificar a espécie de passarinho pelo seu canto, e, quem sabe, revelar a passagem de uma espécie migratória. A imagem de um campo nos é desperta ao escutar o vento soprando por gramíneas, que ressoaria diferente se soprasse por uma floresta. Por conseguinte, podemos registrar a atividade acústica dos organismos e descrever as dinâmicas de ecossistemas através de um conjunto de técnicas oferecidas pelo monitoramento acústico passivo. Além disto, os diversos sons emitidos por animais são produzidos sobretudo para fins reprodutivos e territoriais. Sua produção possui elevado custo energético e influencia se a performance de um organismo resultará em saldo positivo para a perpetuação de seus descendentes. Diante disso, alguns percalços no caminho entre a emissão e a recepção desses sons podem adulterar suas características e inviabilizar seu reconhecimento. Por serem ondas mecânicas, a vegetação pode refratar e absorver elementos dos sons emitidos por animais. Ou ainda, em grandes agregações, como os coros por aves no amanhecer e por anuros e invertebrados ao ocaso, os diversos sons podem gerar interferências. Em ambos os casos, a degradação sonora... (Resumo completo, clicar acesso eletrônico abaixo)<br>Abstract: Nature is noisy. Birds chirps while the wind whistle when brushing the fields, with bees buzzing around flowers. Meanwhile, our absence of mind prevents us to notice many elements rumbling on our surroundings. However, each sound has a source that leaves clues about the situation in which it was produced. The songbird can be identified by its song and eventually reveal the passage of a migratory species. The wind blowing through the grass quickly resemble the image of a field that would otherwise sound different if it blew through a forest. Therefore, such acoustic activity of the organisms can be recorded and used to describe ecosystems dynamics through a set of techniques included in passive acoustic monitoring. In addition, sounds emitted by animals are produced mainly for reproductive and territorial purpose. Its production is costly and influences whether the performance of an organisms will lead a positive balance for the perpetuation of its descendants. As such, obstacles on the path between sound emission and reception may distort its characteristics and impair sound recognition. As sound are mechanical waves, vegetation can refract and absorb elements on the acoustic signal, or in large aggregations, such as dawn bird chorus and dusk anuran and invertebrate choruses, an abundance of animal sounds can generate interferences. In both cases, sound degradation may compromise species’ reproductive success. On the contrary, another perspective predicts that such obstacles ... (Complete abstract click electronic access below)<br>Doutor
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32

Wardle, Ryan N. "Phantom Ocean, Real Impact: Natural Surf Sound Experiments Alter Foraging Activity and Habitat Use Across Taxa." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2239.

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A growing body of research focuses on how background sounds shape and alter critical elements of animals’ lives, such as foraging behavior, habitat use, and ecological interactions (Bradbury & Vehrencamp, 2011; Barber et al., 2010; Kight & Swaddle, 2011; Shannon et al., 2016). Much of this research has centered on the effects of anthropogenic noise (Dominoni et al., 2020; Francis & Barber, 2013; Ortega, 2012; Swaddle et al., 2015), but recent studies have also revealed that natural sound sources can influence animal behavior (Davidson et al., 2017; Le et al., 2019). Natural sounds, such as crashing surf, can create conditions where signaling and listening are difficult, but how this influences different species’ ecological interactions are unknown. To study the effects of crashing surf sound we experimentally introduced landscape-level acoustic playbacks where surf sound was not naturally present to create a “phantom ocean”. Phantom ocean treatment sites were employed alongside higher frequency “shifted” treatment sites to test for frequency-dependent effects, “real ocean” sites where surf sound was endemic, and ambient control sites. The phantom and shifted treatments were played continuously during the spring and summer of 2017-2019. Within this acoustic experimental landscape we conducted multiple studies to test the effects of crashing surf sound on animal behavior, habitat use, and ecological interactions. Through an artificial caterpillar predation experiment modeled after Roslin et al. (2017), we found that when exposed to natural sound treatments the foraging activity of rodents and arthropods increased, while that of birds declined. A potential explanation for this pattern includes taxon-specific responses reflecting different perceived risk-reward trade-offs in natural sound conditions. To follow this up we performed occupancy modeling on data collected by camera traps set within our system. We observed different responses among groups of species with different functional roles in the community for both detection (p) and occupancy (Ψ) probabilities. Our combined results indicate different species and functional groups have unique foraging behavior and patch use responses to natural sounds, likely based on their ecological interactions. Specifically, Cricetid rodents are likely more active in areas exposed to natural sounds, possibly due to lower perceived predation risk because mesocarnivores are less active. Insectivorous birds are also likely less active under natural sounds conditions, although the frequency of the sound, and the body size and diet of the bird appear influential. Together these findings suggest that natural sounds shape not only individual behavioral adjustments, but also multi-trophic, community level interactions. Our results show that natural sounds are an important driver of ecological interactions, but much remains to be uncovered. The mechanisms by which natural sounds influence individuals, populations, and many other aspects of ecology remain unexplored and provide fertile ground for future inquiry.
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Lindell, Niklas. "Habitat Preference and Activity Pattern of Wels Catfish (Silurus glanis) at its Northernmost Distribution Area." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178407.

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Knowledge of Wels Catfish (Silurus glanis) at its northernmost distribution area is limited on even basic behavioral characteristics, such as habitat preferences and activity patterns. It has thus proven difficult to aid the species in any predictable way. In a telemetry study on Wels Catfish, I examined habitat preferences, activity patters and site fidelity of ten adult individualsat their most northern range. Fish were surgically equipped with acoustic transmitters, frequently recording the position of each individual in a small Swedish lake. Wels Catfishpreferred deeper areas than randomly expected during the entire year, except for late spring and early summer. This indicates that spawning took place at shallow, vegetated areas in May-June 2019. Fish were highly active during summer, utilizing the entire lake. Behavior shifted during winter as fish became bottom dwelling with minimal activity, small home ranges and likelyminimal feeding. Wels Catfish had a nocturnal activity pattern during the entire year, but especially during summer. Fish preferred shallower areas during night than during day, indicating that deeper areas were used for resting and shallower areas for foraging. Lastly, home ranges were much larger than expected during summer, implying that S. glanis might be less territorial in small lakes than previously believed. In summary, conservation efforts should focus on protecting and restoring shallow areas with lots of vegetation and food items, adjacent to deep areas with underwater structures. These areas are important for the survival of S. glanisas they fulfill requirements for feeding, reproduction, resting, and hibernation.
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34

Bijoux, Jude peter. "Reef fish spawning aggregation sites : the ecology of aggregating and resident species." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4013.

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Les sites d'agrégation de ponte (AP) sont des zones où des poissons d'une même espèce se rassemblent pour frayer. En dépit de leur importance dans la reproduction de nombreuses espèces de poissons des récifs coralliens, bien peu de sites d'AP sont gérés. Le but de cette étude est d'améliorer la compréhension générale sur l'écologie des sites d'AP en vue de faciliter la gestion. L'étude, réalisée aux Seychelles, se concentre sur les individus regroupant sur les sites d'AP pour frayer et aussi sur ceux résidant sur ces sites. La télémétrie acoustique et le recensement visuel sous-marin ont, ici, été employé comme principaux outils d'observation des espèces formant des agrégations de reproduction (cordonnier (Siganus sutor), mérou camouflage (Epinephelus polyphekadion) et mérou marbré (E. fuscoguttatus)) et des espèces résidant sur les sites d'AP. Les détections acoustiques ont montré que les individus de S. sutor présentent une grande fidélité à leur site de ponte et une périodicité liée à la période de pleine lune. Par ailleurs, les agrégations de ponte d'E. fuscoguttatus et E. polyphekadion se chevauchent spatialement et temporellement avec une forte périodicité liée à la nouvelle lune. La formation d'AP de E. fuscoguttatus et E. polyphekadion provoque des changements complexes dans l'assemblage de poissons résidents sur le site. L'effet de la phase lunaire sur les assemblages de poissons résidant sur les sites d'AP de S. Sutor apparait être dépendant de l'échelle considérée. Les informations sur la dynamique spatiale et temporelle des espèces étudiée sont utilisées pour proposer des mesures de gestion susceptibles d'améliorer la protection des sites d'AP<br>Fish spawning aggregation (FSA) sites are areas where repeated concentration of conspecific fish gathers for the purpose of spawning. Despite of their importance in the reproduction of many coral reef fishes, few FSA sites are actively managed. The aim of this study, conducted in the Seychelles, was to improve general understanding on the ecology of FSA sites to facilitate their management. It focuses on both the individuals that aggregate at FSA sites to spawn and those that are resident at FSA sites. Acoustic telemetry and underwater visual census were used to study three species that form spawning aggregations (spinefoot shoemaker (Siganus sutor), Camouflage grouper (Epinephelus polyphekadion) and Brown-marbled grouper (E. fuscoguttatus)) and the resident fish assemblages at FSA sites. Acoustic detections found individual S. sutor to have high fidelity to individual FSA sites and to show significant periodicity with the full moon period in the timing of their arrival and departure from FSA sites. Conversely, spawning aggregations of E. fuscoguttatus and E. polyphekadion overlapped spatially and temporally, with strong periodicity for spawning aggregation to form with the new moon period. The formation of E. fuscoguttatus and E. polyphekadion FSAs caused complex changes in the fish assemblage that is resident at the FSA site. The effect of lunar phase on the resident fish assemblages at S. sutor FSA sites appeared to be scale-dependent, having greater impact at the larger than the smaller FSA site. Information on the spatial and temporal dynamics of aggregating and resident fish species is used to propose management actions to improve the protection of FSA sites
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35

Collins, Angela. "An investigation into the habitat, behavior and opportunistic feeding strategies of the protected Goliath grouper (Epinephelus itajara)." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5002.

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Groupers (Epinephelidae: Epinephelinae) are apex predators within many reef communities worldwide. Grouper landings contribute significantly to global fisheries, and many populations are suffering from unsustainable levels of exploitation. The large size, site specificity and catchability of most groupers increase susceptibility to fishing pressure, and a large number of grouper species throughout the world are currently overfished. Multiple species are listed as endangered or threatened, and many have suffered local extirpations across their range. Removal of these upper level predators can significantly alter community structure and result in second order effects that may have critical ecological implications. The economic and ecological value of groupers is significant, and data regarding the abundance, habitat and behavior of these exploited species are necessary in order to implement realistic and effective management strategies. Atlantic Goliath Grouper (Epinephelus itajara) historically occurred in tropical and subtropical waters from the west coast of Africa to the east coast of Florida, south to Brazil, and throughout the Caribbean Sea and Gulf of Mexico. As one of the world's largest groupers, individuals are known to reach at least 37 years of age, and may grow to sizes exceeding 2.5 meters and 400 kilograms. The life history and behavioral characteristics of this species amplify vulnerability to exploitation, and Atlantic Goliath Grouper harvest was banned in U.S. waters in 1990 after a noted sharp decline in population numbers. The species has responded encouragingly to protective measures; however, the population's recovery and present status with U.S. waters should be thoroughly evaluated before altering regulatory guidelines. Traditional fishery-dependent data are not available (i.e., landings data); thus estimates of population demographics and recovery are dependent upon directed, fishery independent research efforts. It was the goal of this project to provide information regarding demographics, movement patterns, effects of catch and release angling, and feeding behavior of Atlantic Goliath Grouper within the central eastern Gulf of Mexico. The majority of research involving Atlantic Goliath Grouper began after the stock was already overfished, resulting in the absence of an existing "baseline" with which to compare current population parameters. Replication of visual surveys over a range of depths and habitat types provided an index of abundance for specific sites, and allowed for quantification of the size distribution of individuals. Atlantic Goliath Grouper were most abundant at high relief, high volume artificial reefs within the study area, and the majority of individuals observed were 80 - 160 cm in total length. Knowledge of fish movement, behavior and habitat associations has been used to exploit many species of fish; thus, this knowledge is critical for the creation of regulatory guidelines regarding conservation. Protection from harvest does not immediately imply that fishing mortality is negligible. As opportunistic ambush predators, Atlantic Goliath Grouper are relatively easy to catch on hook and line, and the species is often targeted for sport or caught incidentally during angling efforts for other reef fish species. Acoustic tracking allowed for continuous monitoring of individuals for several years after catch and release events. Barotrauma severity increased with capture depth, but immediate mortality was not observed during this study. Additionally, the length of total monitoring period was not affected by the severity of barotrauma, which suggests that with proper handling, Atlantic Goliath Grouper are not subject to high levels of release mortality in the study area (at depths < 40 m). However, strong site fidelity of Atlantic Goliath Grouper to artificial reefs increases susceptibility to fishing pressure and amplifies interactions with anglers, so the chronic effects of repeated capture remain unclear. Description and quantification of goliath grouper feeding behavior may allow for innovative suggestions to decrease the probability of catch and release mortality, and potentially offer new tactics to reduce opportunistic predation upon hooked fish. Kinematic analysis of Atlantic Goliath Grouper feeding sequences demonstrated that they are capable of modulating feeding behavior based upon prey activity level and position within the water column. Individuals exhibited larger maximum gapes and more rapid feeding sequences when presented with mobile live food. Immobile (dead) food was primarily consumed through suction, and strikes upon these items were characterized by slower, closer approaches, smaller maximum gapes and longer bite durations. It is hopeful that the information presented herein will provide insight regarding the ecology of Atlantic Goliath Grouper and can be applied to future management efforts involving this protected species.
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36

Lossent, Julie. "Acoustique passive et peuplements benthiques avec applications aux études d'impact EMR." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0013/document.

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La compréhension de la dynamique spatiale et temporelle des peuplements benthiques qu’elle soit naturelle et induite par des forçages anthropiques, nécessite de nouvelles méthodes d'observation du benthos avec des besoins affichés de haute résolution temporelle et de longues périodes de mesures. L'enregistrement et l’analyse des sons produits dans l’environnement marin donnent accès au paysage acoustique, et notamment à l’une de ses composantes biologiques la biophonie benthique. Observer les variabilités spatio-temporelles de cette biophonie benthique, afin de contribuer à l'évaluation de la structure, du fonctionnement, de l’état et des évolutions du compartiment benthique, constitue l'objectif principal de la thèse. Pour ce faire nous avons développé deux outils permettant d'évaluer la variabilité spatiale de ces émissions avec un ou plusieurs capteurs. Le premier est un descripteur de la forme des spectres des impulsions du benthos permettant de mieux caractériser la diversité de la biophonie benthique. Le second est une méthode de localisation tridimensionnelle des sources sonores benthiques et de cartographie de cette biophonie pour des échelles spatiales allant de 500 mètres jusqu’à 5 mètres. En utilisant ces deux outils, nous avons démontré la faisabilité de l'observation du benthos au travers de sa biophonie sur des sites spécifiques. Dans une partie applicative, nous nous sommes intéressés aux projets de site de production d’énergies marines renouvelables et à la compréhension et à l’observation de leurs impacts sur la faune marine. Sur un site atelier de géométrie similaire à celle d’une ferme d’éoliennes offshores, nous avons défini, réalisé et analysé une preuve de concept pour l’observabilité d’un effet de type binaire : présence ou absence de faune fixée dans une surface sentinelle de quelques mètres carré. Les travaux de thèse ont été conclus par une étude mesurant le niveau sonore rayonné par une hydrolienne en phase de production d’énergie (Paimpol-Bréhat) puis évaluant les impacts acoustiques sur trois compartiments biologiques : les mammifères marins, les poissons et les invertébrés<br>Understanding the spatial and temporal dynamics of benthic populations, both natural and induced by anthropogenic pressures, requires new observation methods with high temporal resolution and long periods of measurement. The recording and analysis of sounds produced in the marine environment give access to the soundscape, and in particular to one of its biological components, the benthic biophony. Observing the spatiotemporal variability of this benthic biophony, in order to contribute to the evaluation of the structure, functioning, state and evolution of the benthic compartment, is the main objective of the thesis. To do this we have developed two tools to evaluate the spatial variability of these emissions with one sensor or more. The first is a descriptor of the shape of the spectra of the benthic snaps allowing to better characterize the diversity of benthic biophony. The second is a method of three-dimensional localization of the benthic sound sources and mapping of this biophony for spatial scales ranging from 500 meters to 5 meters. Using these two tools, we have demonstrated the feasibility of benthos monitoring through its biophony at specific sites. In an applicative part, we were interested in sites of production of marine renewable energies and the understanding and observation of their impacts on the marine fauna. On a workshop site of geometry similar to that of an offshore wind farm, we defined, realized and analyzed a proof of concept for the observability of a binary impact: presence or absence of fixed benthic fauna in a sentinel area of a few square meters. The thesis work was concluded by a study measuring the sound level radiated by a tidal current turbine in the energy production phase (Paimpol-Bréhat) and then evaluating the acoustic impacts on three biological compartments: marine mammals, fish and invertebrates
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Claireau, Fabien. "Evaluation des impacts de la fragmentation du paysage par une autoroute sur les chauves-souris à différentes échelles spatio-temporelles." Thesis, Paris, Muséum national d'histoire naturelle, 2018. http://www.theses.fr/2018MNHN0018/document.

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Les infrastructures linéaires de transports (ILT), dont les routes, sont une des principales causes du déclin de la biodiversité. Bien que les évaluations environnementales permettent de limiter ce déclin, la séquence "Eviter, Réduire et Compenser" les impacts peine à s'appliquer pleinement. En effet, la séquence ERC fait bien souvent appel à des données qualitatives en oubliant les processus biologiques et/ou écologiques et leur échelle spatio-temporelle. L'impact des routes est globalement bien documenté pour plusieurs groupes biologiques, hormis pour les chauves-souris, pourtant susceptibles d'être très fortement affectées. Par ailleurs, leur protection stricte nécessite leur prise en compte dans la séquence ERC. Pour étudier l’impact des routes, et notamment des autoroutes, je me suis concentré sur l’étude des chauves-souris afin de mesurer et quantifier leur magnitude. Pour cela, différentes méthodes développées et réutilisables par les différents acteurs de terrain seront présentées. Ainsi, dans un premier temps, je me suis intéressé à une méthode de traitement des données issues d'écoutes acoustiques et à une méthode de valorisation. Dans un second temps, nous avons appliqué ces méthodes afin (i) de connaitre quels étaient les impacts des routes sur les populations de chauves-souris et (ii) afin d'évaluer l'efficience des mesures de réductions engagées pour réduire ces impacts. Nos principaux résultats montrent que les autoroutes ont un impact négatif significatif sur l'activité de chasse et de transit pour plusieurs espèces de chauves-souris jusqu'à au moins cinq kilomètres de distance à une autoroute. De plus, l'effet des autoroutes semblerait également avoir des conséquences sur la génétique des populations. Enfin, nous avons étudié les chiroptéroducs, ouvrages dédiés aux chauves-souris visant à réduire ces impacts par l'amélioration des connectivités écologiques. Ce type d'ouvrage dédié semble être approprié lorsqu'il est situé dans des corridors écologiques fins tels que les haies<br>Biodiversity is being lost at an increased rate as a result of human activities. One of the major threats to biodiversity is infrastructural development. Although the measures taken in environmental impact assessments can limit this loss, the mitigation hierarchy to "Avoid, Reduce and Offset" impacts on biodiversity is not fully functional. Indeed, the mitigation hierarchy often uses qualitative data and does not account for the biological and/or ecological processes and their different spatial and temporal scales. The impact of roads is well documented for several biological groups but not for bats whereas they are likely to be very strongly affected. Moreover, as they are strictly protected, they should be considered in the mitigation hierarchy. Therefore, through the study of bats, I investigated the effects of roads, especially major roads, and intended to measure and quantify the magnitude of their impacts. This thesis presents different methods developed to reach this objective and which may be used by stakeholders in the field. First, I intended to determine how to process data collected through passive acoustic monitoring and how to exploit these data. Then I determined what the impacts of roads on bat populations are and I proposed a method in order to assess the mitigation measures which presume to restore bat habitat connectivity. Our main results show a significant negative effect of roads on bats foraging and commuting behaviour for several species and up to at least five kilometres away from a major road. In addition, the effect of major roads also seems to have consequences on populations’ genetics. Finally, we studied bat overpasses which are structures specifically dedicated to bats and aiming at reducing the impacts of roads by improving bats’ habitat connectivity. These structures seem to be appropriate when located in narrow ecological corridors such as hedgerows
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38

Hale, Jennifer Ann. "The Role of Male Vocal Signals During Male-Male Competition and Female Mate Choice in Greater Prairie-Chickens (Tympanuchus cupido)." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365786099.

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39

Lewis, Mattea A. "Roost Selection and Seasonal Activity of a Remnant Population of Northern Myotis (Myotis septentrionalis) in Pennsylvania." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1607005147181749.

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40

Collins, Angela Barker. "An examination of the diet and movement patterns of the atlantic cownose ray rhinoptera bonasuswithin a southwest florida estuary." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001232.

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41

Narango, Desiree Lynn. "Causes and Consequences of Urban-associated Song Variation: A Study of Vocal Behavior in the Northern Cardinal (Cardinalis cardinalis)." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337792731.

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42

Rodríguez, López Ramona. "Prácticas experimentales e indagación sobre sonido, territorio y tecnologías contemporáneas: Cartografías, soportes de escucha y sonidos disruptivos." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/162974.

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[ES] La presente tesis pone el foco en lo sonoro en un momento de cambios disruptivos operados por las tecnologías y su impacto en los globalizados sistemas sociales, culturales, políticos y científicos. La conceptualizada Industria 4.0 acelera a gran velocidad el proceso de digitalización y automatización de todas las esferas, activando nuevas relaciones humano-máquina, máquina-máquina; las ciudades modelos generalizados de vida, concentran gran parte de la actividad social y el volcado de los procesos tecnológicos, la hibridación físico-digital potenciada por la ubicuidad. Ya no se trata de la portabilidad del sonido ni de su reproducción, el cambio se produce por la colonización de nuestro tiempo y espacio, la conectividad infinita que media en todas nuestras transacciones, acontecimientos y la percepción de los lugares; las acciones de corporeización con dispositivos que se vuelven cuasitransparentes (Ihde, 2015), la conversión en cíborg al añadir nuestro cuerpo temporalmente para adaptarnos a un nuevo entorno (Case, 2018); el síndrome de atención parcial continuada (Stone, 2014) que nos mantiene en un estado de alerta, o el tiempo que, según Foucault, está gestionado como artefacto de la cultura y el resultado de las relaciones de poder. Desde el prisma del arte y su vertiente práctica, el estudio ofrece una lectura de la ciudad y los medios digitales a través de sus sonidos, un acercamiento que busca descifrar el carácter de un territorio, encontrar rastros de singularidad o de homogeneidad, la sintonía con los ambientes, y también el pensamiento de lo disruptivo. La investigación se expresa a través de propuestas sonoras y visuales, cartografías simbólicas y perceptivas, conjugadas con metodologías mestizas de estudio teórico-práctico interdisciplinario, en un proceso abierto y fluido de experimentación que se funda en la re-utilización o instanciación de medios, materiales y conceptos de manera que puedan arrojar ideas, lecturas no previstas o activar el pensamiento crítico y estético.<br>[EN] This thesis focuses on sound in times of disruptive changes operated by technologies and their impact on globalised social, cultural, political and scientific systems. The conceptualised Industry 4.0 accelerates the process of digitisation and automation at great speed and on all spheres, activating new human-machine, machine-machine relationships; cities, the generalised models of life, gather a large part of social activity and the dumping of technological processes, the physical-digital hybridisation promoted by ubiquity. It is no longer about the portability of sound or its reproduction, the change is takes place by the colonisation of our time and space, the infinite connectivity that mediates all our transactions, events and the perception of places; embodiment actions with devices that become quasi-transparent (Ihde, 2015), the transformation into cyborgs by temporarily adding our bodies to adapt to a new environment (Case, 2018); the syndrome of continued partial attention (Stone, 2014) that keeps us in a state of alert, or the time that, according to Foucault, is managed as a device for culture and the result of power relations. From the eyes of art and its practical side, the study offers a reading of the city and the digital media through its sounds, an approach that seeks to decipher the nature of a territory, find traces of singularity or homogeneity, the harmony with the environments, and also the thought of the disruptive. The research is expressed through sound and visual proposals, symbolic and perceptual cartographies, blended with hybrid methodologies of interdisciplinary theoretical-practical study, in an open and fluid experimentation process that is based on the re-use or instantiation of media, materials and concepts so that they can shed ideas, unforeseen readings or activate critical and aesthetic thinking.<br>[CA] Aquesta tesi posa el focus en allò sonor en un moment de canvis disruptius operats per les tecnologies i el seu impacte en els globalitzats sistemes socials, culturals, polítics i científics. La conceptualitzada Indústria 4.0 accelera a gran velocitat el procés de digitalització i automatització de totes les esferes, i activa noves relacions humà-màquina, màquina-màquina. Les ciutats, models generalitzats de vida, concentren una gran part de l'activitat social i l'abocament de dades dels processos tecnològics, la hibridació físicodigital potenciada per la ubiqüitat. No es tracta ja de la portabilitat del so ni de la seua reproducció, el canvi es produeix per la colonització del nostre temps i espai, la connectivitat infinita que media en totes les nostres transaccions, esdeveniments i la percepció dels llocs; les accions de corporeïtzació amb dispositius que es tornen quasitransparents (Ihde, 2015), la conversió en cíborg en afegir el nostre cos temporalment per a adaptar-nos a un nou entorn (Case, 2018), la síndrome d'atenció parcial continuada (Stone, 2014), que ens manté en un estat d'alerta, o el temps que, segons Foucault, és gestionat com a artefacte de la cultura i el resultat de les relacions de poder. Des del prisma de l'art i el seu vessant pràctic, l'estudi ofereix una lectura de la ciutat i els mitjans digitals a través dels seus sons, un acostament que busca desxifrar el caràcter d'un territori, trobar rastres de singularitat o d'homogeneïtat, la sintonia amb els ambients, i també el pensament del disruptiu. La investigació s'expressa a través de propostes sonores i visuals, cartografies simbòliques i perceptives, conjugades amb metodologies mestisses d'estudi teòric i pràctic interdisciplinari, en un procés obert i fluid d'experimentació que es funda en la re-utilització o instanciació de mitjans, materials i conceptes de manera que puguen llançar idees, lectures no previstes o activar el pensament crític i estètic.<br>A la Universitat Politècnica de València por la beca FPI y la estancia de investigación concedidas para dar cobertura económica a este trabajo y ayudar a mi formación.<br>Rodríguez López, R. (2021). Prácticas experimentales e indagación sobre sonido, territorio y tecnologías contemporáneas: Cartografías, soportes de escucha y sonidos disruptivos [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/162974<br>TESIS
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43

Šukutis, Nerijus. "Abiotinių veiksnių įtaka žuvų pasiskirstymui Raseinių rajono Kaulakių II (Kybartėlių) tvenkinyje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040615_102358-48668.

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The influence of abiotic factors on fish distribution in Kaulakiai II water reservoir is investigated in present master thesis. Object of research – fish communities of Kaulakiai II water reservoir, situated near Raseiniai. Aim of the research – to estimate the substantial abiotic factors and to evaluate their influence on fish distribution in Kaulakiai II water reservoir. To meet an aim these tasks were set: to estimate the most abundant fish species in reservoir; to estimate and map the structure of the bottom; to evaluate sensual indicators of alive fish during the experimental fishing; to value the quality of water in Kaulakiai II reservoir and to rate it according the standards applied for water quality in carp ponds; to detect peculiarities of fish distribution in water body and to exclude the substantial abiotic factors that have hold on fish distribution in Kaulakiai II (Kybartėliai) reservoir. Methods of research – logical literary analysis, hydro acoustic surveying, written quiz of local anglers, observational studies, mathematical modeling. Results: the Cyprinid fishes (11 species) were the most abundant in Kaulakiai II reservoir fish communities with overall 15 fish species resident. The bottom structure mainly was silt - 83,2 %, sand and oozy sand, respectively 4,6 and 12,2 %. Fish injures, parasites, diseases had no influence on fish distribution in Kaulakiai II reservoir during the research. Low oxygen concentrations were estimated at the bottom of reservoir... [to full text]
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44

Širović, Ana. "Blue and fin whale acoustics and ecology off Antarctic Peninsula." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3214542.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed June 30, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 121-143).
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45

Björklund, Aksoy Simon. "Do potentially seal-safe pingers deter harbour porpoises (Phocoena phocoena) in the vicinity of gillnets and thereby reduce bycatch?" Thesis, Linköpings universitet, Biologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170512.

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Incidental bycatch in gillnets is a substantial threat to small cetaceans. Using Acoustic Deterrent Devices, “pingers”, have successfully reduced bycatch of harbour porpoises in gillnets. However, seals can use pingers as “dinner-bells” to easier find gillnets in order to raid and destroy them, further aggravating the existing conflicts between seals and coastal fisheries. Therefore, in the present study, the efficiency of two alleged “seal-safe” pingers, an experimental Banana pinger “SSB” and a Future Oceans F70 pinger “FO”, in deterring harbour porpoises from the vicinity of gillnets and thereby reducing bycatch in commercial gillnet fisheries, was tested. This was done by deploying click detectors, “C-PODs”, recording Detection Positive Minutes per hour, at each end of gillnets, provided with the two pinger types or no pingers at all. Bycatch instances were recorded into logbooks by participating fishermen and verified using video footage from on-board video cameras. Results showed that video monitoring was a reliable method for verifying the number of bycatches of porpoises and seals, but not seabirds, recorded in the fishermen’s logbooks. The experimental SSB pingers and the FO pingers significantly reduced porpoise presence, measured as Detection Positive Minutes per hour in the vicinity of the nets, compared to gillnets without pingers. However, the sample size was too small to yield a significant result regarding the bycatch reducing efficiency and dinner bell effect of the experimental pingers. Nevertheless, bycatch trends suggest that pingers did in fact reduce porpoise bycatch. Although both successful, FO pingers were slightly more efficient in deterring porpoises than SSB pingers. The SSB pinger sounds had bigger directionality variations than the FO pinger, which may have affected its deterrent effects. Therefore, additional trials are needed to further investigate this aspect.
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46

Sharpe, Deborah Lynn. "Call types of Bigg's killer whales (Orcinus orca) in western Alaska| Using vocal dialects to assess population structure." Thesis, Alaska Pacific University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10104546.

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<p> Apex predators are important indicators of ecosystem health, but little is known about the population structure of Bigg&rsquo;s killer whales (<i> Orcinus orca</i>; i.e. &lsquo;transient&rsquo; ecotype) in western Alaska. Currently, all Bigg&rsquo;s killer whales in western Alaska are ascribed to a single broad stock for management under the US Marine Mammal Protection Act. However, recent nuclear microsatellite and mitochondrial DNA analyses indicate that this stock is likely comprised of genetically distinct sub-populations. In accordance with what is known about killer whale vocal dialects in other locations, I sought to evaluate Bigg&rsquo;s killer whale population structure by examining the spatial distribution of group-specific call types in western Alaska. Digital audio recordings were collected from 33 encounters with Bigg&rsquo;s killer whales throughout the Aleutian and Pribilof Islands in the summers of 2001-2007 and 2009-2010. Recorded calls were perceptually classified into discrete types and then quantitatively described using 12 structural and time-frequency measures. Resulting call categories were objectively validated using a random forest approach. A total of 36 call types and subtypes were identified across the entire study area, and regional patterns of call type usage revealed three distinct dialects, each of which corresponding to proposed genetic delineations. I suggest that at least three acoustically and genetically distinct subpopulations are present in western Alaska, and put forth an initial catalog for this area describing the regional vocal repertoires of Bigg&rsquo;s killer whale call types.</p>
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47

Pereira, Tadeu José Faria de Sousa. "Effects of the implementation of the MPAs from the Alentejo coast on local fish communities and on some species with commercial/conservation interest." Doctoral thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/23431.

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Tendo em conta o seu sucesso, as Áreas Marinhas Protegidas (AMP) têm sido implementadas como ferramenta de gestão de recursos pesqueiros. Contudo, o uso desta ferramenta em portugal é ainda relativamente recente. Tendo em conta esta necessidade, em 2011 foi criado o Parque Marinho do Sudoeste Alentejano e Costa Vicentina, que inclui várias AMPs. Duas destas estão localizadas na costa alentejana do referido parque. A eficiência destas ferramentas depende dum planeamento e gestão adequados. De facto, a dimensão duma AMP tem um papel importante na sua eficácia e no tempo necessário para que alterações nas suas comunidades piscícolas seja evidentes. AMPs de maior dimensão e mais antigas tendem a apresentar maiores densidades e exemplares de maior tamanho. Nesse sentido, o principal objectivo desta tese foi avaliar se a designação de pequenas AMPS podem causar impactos positivos a curto prazo em espécies de interesse comercial, nas suas comunidades piscícolas e nas actividades de pesca local. No caso da AMP da Ilha do Pessegueiro, esta provou ser importante e adequada para proteger algumas espécies de interesse comercial, como moreias, safios e sargos, que encontram na zona refúgio e alimento. As comunidades de peixes locais também foram positivamente impactadas, vendo um aumento significativo na sua abundância e diferenças na sua composição quando comparadas com áreas não protegidas. O efeito mais imediato destas medidas é a perda de área de pesca para a frota pesqueira. No entanto, a deslocalização da frota para áreas próximas resultou num aumento das descargas com o tempo. De um modo geral, este trabalho valida a implementação destas medidas como adequadas e eficazes para a proteção marinha e para a exploração sustentável dos recursos. Confirma também que pequenas AMPs podem ser eficazes a curto prazo. No entanto, uma monitorização contínua dos impactos é indispensável. Assim, é aconselhada a manutenção destas medidas de protecção na costa Alentejana; Summary: Effects of the implementation of the MPAs from the Alentejo Coast on local fish communities and on some species with commercial/conservation interest. Given their success, MPAs have been widely implemented as fisheries management tools. However, the use of MPAs as conservation and management tools in Portugal is recent. In 2011, the Costa Vicentina and Sudoeste Alentejano (PNSACV) Marine Park was implemented which included several no take MPAs. Two of these were in the Alentejo coast of the Park. MPA efficiency depends on adequate planning and an appropriate management. In fact, the size of the MPA plays an important role on how effective it can be, and how fast changes on fish assemblages may occur. Larger and older MPAs tend to present higher densities and larger specimens than younger or smaller MPAs. The main objective of this dissertation was to evaluate if the designation of small no take MPAs can cause positive impacts at a short term on commercially important fish species, local fish communities and local fisheries. The implementation of the Pessegueiro Island no take MPA proved to be important and adequate for protecting commercially important species, such as morays, congers and seabreams, who find in this area optimal feeding and sheltering areas. Local fish assemblages were also positively impacted by the designation of both no take MPAs, with a significant increase in fish abundance and significant differences in their structure between protected and neighbouring areas. The most immediate consequence of these protective measures was the loss of available fishing grounds, but fleet relocation resulted in the increase in fish landings over time. Overall, this work validates the implementation of these measures as adequate and effective protection tools for marine conservation and sustainable resource exploitation. It also confirms that small no take MPAs can be short term effective. However, continuous monitoring is of the uttermost importance to adapt protective measures. Given this, the continuity of the protective measures in place is advised.
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48

Warner, Katherine Anne. "Investigating the effects of noise pollution from energy development on the bat community in the Piceance Basin." Thesis, Colorado State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10149854.

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<p> Throughout the United States, and globally, there has been recent interest in large-scale monitoring of bats, driven largely by the many threats that bats currently face such as climate change, white nose syndrome, habitat loss, and wind energy development. Additionally, many human activities generate sensory disturbances including anthropogenic light and noise pollution that have been shown to affect habitat use and foraging efficiency in bats and other wildlife. My research took place in the Piceance Basin of northwestern Colorado, where there has been considerable development of natural gas resources in recent years. During the drilling phase for natural gas, drill rigs run continuously for weeks to months at each well development site. In addition to the physical disturbance and increased human presence at the well pad, drill rigs are brightly lit, and also emit high amplitude anthropogenic noise. The light and noise from active drill rigs can travel many miles from the source, far beyond areas where wildlife habitat has been physically disturbed. The goal of my research was to isolate noise from the other associated forms of disturbance, and investigate what, if any, effects drilling noise is having on the bat community. </p><p> My dissertation is comprised of three stand-alone chapters, as follows. In Chapter 1, I test two different strategies for deploying bat detectors to determine which strategy yields higher detection and species identification rates. In Chapters 2 and 3, I present the results of noise playback experiments. Chapter 2 compares bat activity levels at control sites, and at treatment sites where noise was added experimentally. In Chapter 3, I monitor bat activity patterns both during and after a noise playback experiment to determine how rapidly activity levels recover post-exposure. A brief summary of each chapter follows. </p><p> In Chapter 1, I focus on the methods for recording bat echolocation calls, and identifying free-flying bats in the field. Unlike capture techniques, current acoustical methods for bat monitoring do not provide information about unique individuals, age, sex, or reproductive status. What acoustical monitoring can provide is information about bat activity levels, habitat use, and species identification in some cases, without interfering with bat movement, foraging, or other activities. The commercially available technology for recording bat echolocation calls has rapidly advanced, and there are many ultrasound detector&ndash;recorder systems (hereafter, &lsquo;bat detectors&rsquo;) available with a wide range of recoding options. Due to rapid attenuation of ultrasound signals, one of the challenges to acoustical monitoring is the relatively limited recording range of bat detectors. To increase this range, I took advantage of a bat detector that had the ability to record on two channels (in stereo). By attaching microphone extension cables, I was able to increase the distance between the left and right channel microphones, thereby increasing the acoustical sampling space. When this data collection effort took place, the SM2BAT+ detector from Wildlife Acoustics, Inc. was the only commercially available bat detector that had the two-channel recording capability. I deployed two identical bat detectors at each study site, and compared the recordings made using the stereo option to recordings made from a single channel. </p><p> In general, the stereo setup outperformed the single-channel systems. With the stereo microphones separated by approximately 10 m, the bat detectors that recorded in stereo produced 2.7 times more recordings overall. The increased number of recordings resulted in a higher number of calls that could be identified to species. The benefit of the stereo setup was not equal for all species. With the stereo microphones only about 10 m apart, there was some overlap between the calls that were identified on the left and right channels. The highest rate of overlap (19.5%) was in big brown bats (<i>Eptesicus fuscus </i>). Rates of overlap for species in the Myotis genus were all less than 5%, and none of the recordings of pallid bats (<i>Antrozous pallidus </i>) were identified on both channels for the same bat-pass-event. The stereo option is a promising way to increase the number of bat recordings, which may be a particularly useful when surveying for rare species. </p><p> In Chapter 2, I used a noise playback experiment to isolate noise from other forms of anthropogenic disturbance, and monitored the bat activity level response. I recorded the sounds of an active drill rig, and played these recordings at treatment sites. I measured sound pressure levels at the drill site, and estimated the sound pressure levels at the noise playback sites. Using outdoor speakers, I was unable to project the drill rig noise at the same amplitude of an actual rig, but I was able to significantly elevate the sound levels at treatment sites. The noise levels at treatment sites roughly corresponded to noise levels that can be experienced approximately 100 m from a drill rig. This distance from a drill rig is typically beyond the well pad, in habitat that is not physically disturbed. There is widespread recognition that noise, light, and other sensory disturbances can affect the behavior and physiology of wildlife. The goal of the experiment was to determine if noise alone impacted the activity levels of bats, after being separated from the other forms of disturbance at a drilling site. I projected noise at treatment sites that were not already developed, and paired these treatment sites with control sites with no added noise. I conducted this experiment in 2013 and 2014, and present the results from 20 sites each year (10 control-treatment pairs annually). </p><p> Both years, there was an overall decrease in bat activity at treatment sites, when compared to control sites. In 2013, 8 of the 10 treatment sites had lower estimated bat activity levels. In 2014, all 10 treatment sites had lower estimated activity levels, although for some control-treatment pairs there was overlap in the credible intervals. Multiple species showed signs of reduced activity at treatment sites. For both years, <i>M. ciliolabrum </i> and <i>L. cinarius</i> had reduced activity levels at treatment sites. The response of other species was more idiosyncratic, with reduced activity in one field season, and inconclusive or no response during the other year. The species that did respond to the noise treatment have very different life histories, making it difficult to generalize about how any given species may respond to noise. </p><p> Chapter 3 focuses on bat activity level trends over time during a two period cross-over experiment. The classic two-period crossover experiment consists of two treatments (i.e., treatments &lsquo;A&rsquo; and &lsquo;B&rsquo;), where each site is exposed to both treatments, and the order of the treatments is randomly assigned. For this study, &lsquo;A&rsquo; refers to no added noise, and &lsquo;B&rsquo; refers to a noise treatment consisting of the projected recording of drilling noise. A total of 12 sites were randomly assigned to the A:B sequence, and 13 sites were assigned to the B:A sequence. I acoustically monitored bat activity throughout the experiment, with particular interest in understanding the activity level dynamics post-exposure to the noise treatment. Most studies that investigate the impacts of noise on wildlife have focused on the response to noise during a noise treatment period, or noise event. Only a handful of previous studies have addressed the post-exposure period after noise ends. In these studies, noise treatments or events were relatively short in duration (a few minutes), and the corresponding recovery period was monitored over a similarly brief timeframe. My study differs in both the duration of the noise treatment (continuous noise over six days/nights), and in the duration of the post-exposure monitoring period (also six days/nights). I focused on the response of four bat species, <i>Myotis ciliolabrum, Myotis evotis, Lasiurus cinareus,</i> and <i>Taderida brasiliensis.</i> </p><p> Of the four focal species, <i>M. evotis</i> showed no substantial response to the noise treatment. The responses of <i>M. ciliolabrum</i> and <i>T. brasiliensis</i> were somewhat challenging to interpret. The overall activity levels of these species were lower during the treatment period in the A:B sequence, but they also had declining activity levels throughout the pre-exposure period. The activity patterns of <i>L. cinareus</i> provided the most convincing evidence of noise avoidance. Furthermore, <i> L. cinareus</i> activity levels did not show signs of recovery after the noise treatment ended in the B:A sequence. This suggests that after the six-day post-exposure period, there were still lingering effects of noise on <i>L. cinareus</i> activity levels. This study provides evidence that the effects of noise can linger for multiple days post-exposure. Future wildlife studies that assess periods of post-exposure could contribute meaningfully to this area of research, and aid in the development of conservation and mitigation efforts.</p>
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49

Santos, Marcos Roberto Rossi. "Comportamento e ecologia ac?stica da baleia jubarte (Megaptera novaeangliae) na regi?o Nordeste do Brasil." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17228.

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Made available in DSpace on 2014-12-17T15:36:39Z (GMT). No. of bitstreams: 1 MarcosRRS_TESE_2red.pdf: 2914202 bytes, checksum: 607aa226333ce661d0e57d380f43b9e9 (MD5) Previous issue date: 2012-08-07<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The acoustic ecology concept involve the relation between the live organisms and their sound environment and is applied in the present work to study the context in which the humpback whale (Megaptera novaeangliae) singing behavior, known as the most complex display in the nature, occurred in the northeastern Brazilian coast, outside the core area of Abrolhos Bank, between 2005 and 2010.I analyze the singer male occurrence , their spatial distribution and probable relations with oceanographic features, such as depth, tide regimen and moon phases. I also describe the acoustic structure and temporal variation of the singing behavior, based on song frequency and time measurements outside the Abrolhos Bank, and further compare the song complexity, registered in the same period, between Abrolhos Bank (16?- 19? S, 37?- 39? W) and the adjacent North Coast, herein considered from Itacar? (14? S, 38? W) to Aracaju (11? S, 37? W). Additionally, I look for describe and analyze anthropogenic noise sources in the marine environment of the study area, produced by the oil industry as well as by the whale watching operation, relating their frequencies to the acoustic niche utilized by the humpbacks. The results indicated a great plasticity in the singing behavior, evidenced by the occurrence of singer males in diverse social structures, from solitary individuals to other groups, even containing females and calves, as well as by the diversity which compound the song, when compared between two regions inside the same breeding area, which present distinct oceanographic characteristics. The singer male distribution may be related with the continental shelf extent along the study area. The anthropogenic noise presented frequency range, amplitude and sound intensity in potential to interfere acoustically in the singing behavior of the species, may resulting in disturbance during the breeding season in the Brazilian coast. Implications about the obtained results in the humpback whale mating system are discussed. In this way, I pretend to contribute with the acoustic ecology subject and provide information to subsidize humpback whale conservation<br>O conceito de ecologia ac?stica envolve a rela??o entre os organismos vivos e o seu ambiente sonoro e ? aplicado no presente trabalho para estudar o contexto no qual ocorreu o comportamento de canto da baleia jubarte (Megaptera novaeangliae), considerado o mais complexo comportamento reprodutivo (display) da natureza, na costa nordeste do Brasil, fora da concentra??o reprodutiva do Banco de Abrolhos, entre os anos de 2005 e 2010. Analiso a ocorr?ncia de machos cantores em diferentes estruturas de grupo, sua distribui??o espacial e prov?veis rela??es com fatores oceanogr?ficos, como profundidade, regime de mar?s e fases da lua. Tamb?m descrevo a estrutura ac?stica e a varia??o temporal do comportamento de canto, baseado em medi??es de frequ?ncia e tempo dos cantos, fora do Banco de Abrolhos, al?m de comparar a complexidade do canto, registrada no mesmo per?odo de estudo, entre o Banco de Abrolhos (16?- 19? S, 37?- 39? W), e a Costa Norte adjacente, aqui considerada desde Itacar? (14? S, 38? W) a Aracaj? (11? S, 37? W). Ainda busco descrever e analisar as fontes de ru?dos antropog?nicos no ambiente marinho da ?rea de estudo, produzidos pela atividade de explora??o de petroleo e g?s e tamb?m pelo turismo de observa??o de baleias, relacionando-os com o nicho ac?stico utilizado pela jubarte. Os resultados indicaram uma grande plasticidade no comportamento de canto, evidenciado pela ocorr?ncia dos cantores em diversas estruturas sociais, de indiv?duos solit?rios a grupos contendo outros animais, inclusive f?meas com filhotes, bem como pela diversidade que comp?e o canto da esp?cie, quando comparado entre duas regi?es dentro da mesma ?rea de reprodu??o, como o Banco de Abrolhos e a Costa Norte, que apresenta caracter?sticas oceanogr?ficas distintas. A distribui??o dos machos cantores parece estar relacionada com a extens?o da plataforma continental na ?rea de estudo. Os ru?dos antropog?nicos produzidos demonstraram uma faixa de frequ?ncias, amplitude sonora e intensidade capazes de interferir acusticamente no comportamento de canto da esp?cie, podendo resultar em dist?rbios durante o per?odo de reprodu??o da esp?cie na costa brasileira. Implica??es sobre os resultados obtidos na teoria do sistema de acasamento da esp?cie s?o discutidas. Dessa forma, pretendo contribuir com o tema da ecologia acustica e gerar informa??es que subsidiem a conserva??o da baleia jubarte
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Marin-Cudraz, Thibaut. "Potentialité de la bioacoustique comme outil de dénombrement d'espèces difficiles d'accès : cas du Lagopède alpin (Lagopus muta)." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSES044.

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Les recensements de populations de lagopèdes alpin (Lagopus muta) mâles se font par points d’écoute au printemps (fin mai – début juin). Plusieurs observateurs se placent à des points donnés au sein de la zone à recenser et passent une heure à écouter les mâles chanteurs pour essayer d’en déduire une estimation. Les conditions de comptages sont difficiles et font douter de la bonne représentativité de ce protocole. Le premier objectif de la thèse a été de quantifier les biais du comptage. La thèse s’est donc ensuite attachée à trouver des pistes pour développer de nouvelles méthodes de comptages pour compenser les biais du comptage traditionnel. Les signaux acoustiques émis par les animaux portent plusieurs niveaux d’informations, tel que l’identité de l’émetteur. La deuxième partie de ma thèse a montré que les techniques de bioacoustique basées sur les différences acoustiques des vocalisations étaient applicables au lagopède et qu’il était ainsi possible de déterminer le nombre de mâles dans une zone à l’aide des sons qu’ils produisent. La troisième partie de la thèse est une généralisation de la méthode sur des enregistrements à long terme en conditions de terrains réelles.Il a été non seulement possible d’obtenir le nombre de mâles mais également le temps de présence de chaque mâle et d’y relier son statut reproducteur. En conclusion, j’ai montré l’intérêt de l’outil bioacoustique comme outils de suivi des populations de lagopèdes alpins. Ma thèse ouvre des perspectives futures pour un suivi à larges échelles temporelles et spatiales des populations de lagopèdes<br>Population censuses of male rock ptarmigans (Lagopus muta) are conducted by point count protocol in spring (late May - early June). Several observers are placed at given points within the area and spend an hour listening to singing males to try to deduce an estimate of their number. The counting conditions are diffcult and cast doubt on the good representativeness of this protocol.The first objective of this thesis was to quantify the counting biases. The thesis then focused on finding ways to develop new counting methods to compensate for the biases of traditional counting. The acoustic signals emitted by animals carry several levels of information, such as the identity of the transmitter. The second part of my thesis showed that bioacoustic techniques based on acoustic differences in vocalizations were suitable to ptarmigan and that it was possible to determine the number of males in an area using the sounds they produce. The third part of the thesis is a generalization of the method on longterm recordings under real field conditions. It was not only possible to obtain the number of males but also the time of presence of each male and to assess his reproductive status.In conclusion, I showed the interest of the bioacoustic tool to monitor ptarmigan’s populations. My thesis opens up perspectives for futur large scale temporal and spatial monitoring of ptarmigan’s populations
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