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Dissertations / Theses on the topic 'Benthic biodiversity'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Godbold, Jasmin Annica. "Marine benthic biodiversity-ecosystem function relations in complex systems." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2008. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=24847.

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2

ROGELJA, MANJA. "Benthic ecosystem functioning." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908054.

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The main aim of this doctoral research project was to assess the benthic ecosystem functioning in areas subjected to multiple and diffuse impacts. The Aeolian Islands, originated by the volcanic activity and characterised by continuous gas emissions and presence of thermal vents on the surrounding seabed, represent a good natural laboratory for global warming and carbon capture and storage (CCS) leakage studies. The aim of this work was to investigate to what extend the high CO2 alone and in combination with the high temperature affects the microphytobenthic abundance and its community composi

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3

Norling, Karl. "Ecosystem functions in benthos : importance of macrofaunal bioturbation and biodiversity for mineralization and nutrient fluxes /." Göteborg : Dept. of Marine Ecology,Göteborg University, 2007. http://www.loc.gov/catdir/toc/fy0801/2007423873.html.

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MANEA, ELISABETTA. "Microbial biodiversity and viral impact in benthic deep-sea ecosystems." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245403.

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Gli ambienti marini profondi ricoprono il 95% del globo terrestre e sono caratterizzati da basse temperature, assenza di luce ed elevate pressioni. Tra i sistemi marini profondi i più remoti e inesplorati sono le fosse adali, sistemi che possono superare gli 11000 m di profondità. Lo studio di questi ambienti estremi rappresenta una delle più grandi sfide della ricerca scientifica a causa delle difficoltà che si presentano nel raggiungerli. Questo studio fornisce i primi dati riguardanti l’impatto dei virus sui procarioti che abitano i sedimenti di tre tra le più profonde fosse oceaniche conos

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5

CARUGATI, LAURA. "Molecular analysis of marine benthic biodiversity: methodological implementations and perspectives." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245338.

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La biodiversità marina regola il funzionamento ecosistemico, responsabile della produzione di beni e servizi importanti per la biosfera e il benessere umano. La stima della biodiversità è uno degli obiettivi fondamentali della scienza. I cambiamenti globali e le attività antropiche stanno avendo un impatto crescente sugli ecosistemi. Le valutazioni d'impatto e i programmi di monitoraggio si basano su specie di grandi dimensioni, trascurando gli organismi di piccola taglia come la meiofauna (20-500 µm), a causa delle difficoltà connesse con la tradizionale identificazione morfologica. L’obietti

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6

Cornelius, Nils. "Biodiversity and ecology of benthic foraminiferans from the Antarctic deep sea." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416476.

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Townsend, Michael. "Biodiversity and ecosystem functioning : exploring the relationship for subtidal marine benthic fauna." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495912.

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8

Martín, Martín Rafael Pablo. "Benthic marine algae from South Shetland Islands (Antarctica): biodiversity and evolutionary patterns." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/673828.

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The present work focuses on different aspects related to the Antarctic seaweed. As the main primary producers of the coastal areas of Antarctica, this group of organisms play a key role in shaping the biological communities and the ecological dynamics of Antarctic shores. However, compared to other groups of Antarctic organisms or the seaweed communities of other regions of the world, Antarctic macroalgae remain less studied. This is especially true in several areas of knowledge as their actual biodiversity, their evolutionary history and patterns, some aspects of their ecology or the total ex

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9

Rösth, John. "Comparison of the benthic fauna within the littoral in two affected lakes situated in central Sweden." Thesis, Mittuniversitetet, Avdelningen för naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-27595.

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The benthic animals have important roles in benthic communities. Indicator organisms can tell things about a lakes status. Many of them are sensitive to acidification but there are also tolerant taxa. Some prefer eutrophic environments. The benthic fauna can therefore decide a lakes status since some species prefer different environments. The focus of this study was to compare benthic fauna within the littoral in the lakes Sidsjön and Vintertjärnen. They are situated a little south of Sundsvall, central Sweden and belong to the water system of Selångersån. The comparison was done at eight rand

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10

Hassanzada, Caidra Elizabeth. "Biodiversity and Ecological Dynamics of Sciophilous Benthic Communities on Artificial Plates: Emphasis on Reef Sponges." NSUWorks, 2015. http://nsuworks.nova.edu/occ_stuetd/390.

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Low light intensity habitats harbor unique sciophilous benthic communities and are a source of novel and unique sponge fauna. However, the community structure of these habitats is poorly studied to date. Thus, this study attempts to understand the composition and structure of sciophilous sponge populations in southeast Florida. Fifty limestone plates were placed on a shallow reef in Fort Lauderdale for two years (2010-2012). To identify the sponge community and their patterns over time, all plates were photographed at the end of each year. Then, samples were taken from each of the live sponge

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11

Karlson, Agnes M. L. "Benthic use of phytoplankton blooms uptake, burial and biodiversity effects in a species-poor system /." Doctoral thesis, Stockholm : Department of Systems Ecology, Stockholm University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-32598.

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Diss. (sammanfattning) Stockholm : Stockholms universitet, 2010.<br>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: In press. Paper 5: Manuscript. Härtill 5 uppsatser.

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12

Sun, Ye. "Studies on Spring Conservation: Biological Indicators, Habitat Classification and its Assessment." Kyoto University, 2020. http://hdl.handle.net/2433/253446.

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付記する学位プログラム名: 京都大学大学院思修館<br>Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(総合学術)<br>甲第22610号<br>総総博第10号<br>新制||総総||2(附属図書館)<br>京都大学大学院総合生存学館総合生存学専攻<br>(主査)教授山敷庸亮, 准教授趙亮, 准教授竹門康弘<br>学位規則第4条第1項該当

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13

González, Trujillo Juan David. "Dissecting the assembly process of benthic communities from Neotropical streams." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/670235.

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I used the metacommunity framework to dissect the relative influences of dispersal (in ecological and evolutionary timeframes), selection (driven by abiotic factors) and ecological drift on the assembly process of freshwater benthic communities. The study was carried out at 26-32 different stream segments within an area of about 40,000km2, in the Colombian Orinoco. The area encompasses an elevation gradient from 3400 to 300m a.s.l. and includes a heterogeneous assembly of ecoregions and landscapes. By using a pattern-matching approach, I provide evidences supporting that dispersal, selection a

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van, der Grient Jesse. "Under pressure : macro-ecological patterns in the benthic macrofauna in the northwest Atlantic deep sea." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9e4f7dc5-fdb9-46d2-86d4-3b3343b7d4da.

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Deep-sea systems are understudied compared to any other ecological system on Earth, but they are important for ecosystem functioning and services. The deep sea is important in the climatic regulation of Earth, and it is a new frontier for resource provisioning for humanity. Impacts, such as increased carbon emissions and deep-sea fishing and mining will likely influence the system, but these effects are not well understood. To recognise these impacts, common patterns in community structure need to be understood. This study aims to assess community structure in the deep sea by looking at patter

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15

Wang, Yuning. "Patterns in biodiversity and distribution of benthic Polychaeta in the Mississippi Canyon, Northern Gulf of Mexico." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3058.

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The distribution of benthic polychaetes in the Mississippi Canyon was examined to evaluate impacts of environmental variables on species assemblages. Environmental variables considered included depth, bathymetric slope, hydrographic features, sediment grain size, food availability and sediment contamination. Samples were collected using GOMEX boxcorer. Density decreased with increasing depth exponentially. Diversity exhibited a unimodal pattern with depth with a maximum value in the intermediate depth range (about 1269 m). Deposit feeders were the most abundant feeding guild. Both the feeding

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16

ROVETA, CAMILLA. "Biodiversity and Trace Elements: Community Assessments and Application of Benthic Organisms as Biomonitors of Environmental Pollution." Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/299026.

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L’applicazione di organismi bioindicatori, per descrivere possibili cambiamenti dovuti a impatti antropici o naturali, è aumentata negli ultimi decenni grazie all’implementazione della legislazione Europea (es., Water Framework Directive, Marine Strategy). In quest’ottica il monitoraggio periodico delle comunità marine assume un ruolo cruciale. Obiettivo di questo progetto è stato la caratterizzazione delle comunità a idroidi (Cnidaria:Hydrozoa) e spugne (Porifera) delle isole di Montecristo e Giglio, appartenenti al Parco Nazionale dell’Arcipelago Toscano destinato a futura istituzione come A

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17

Benedet, Ramon Augusto. "The bottom longline fishery and its use as a source of benthic biodiversity information around South Georgia." Thesis, Open University, 2017. http://oro.open.ac.uk/48676/.

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South Georgia is a large, old, and isolated oceanic archipelago in the Atlantic sector of the Southern Ocean. It is surrounded by a wide continental shelf which is highly productive, rich in biodiversity and one of the world’s largest Marine Protected Areas. Most of its ~1450 species live on the seabed, many are endemic or at the edge of their geographic ranges, but are still quite poorly known. This UK overseas territory is administered by the Government of South Georgia and South Sandwich Islands and its waters are designated Food & Agricultural Organisation (FAO) area 48.3. They form an imp

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18

Wong, Clara. "The effects of green shelled mussel mariculture on benthic communities in Hauraki Gulf." Click here to access this resource online, 2009. http://hdl.handle.net/10292/663.

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Sea-bed benthic-invertebrate assemblages of species within and proximal to an existing mussel farm off Taniwhanui Point, eastern Waiheke Island, are reported. Substratum type, whether predominantly mud, gravels or an admixture of the two, mud/gravels, is shown to influence infaunal species assemblage composition; the bivalve Theora lubrica, ostracods, amphipods and polychaetes characterise muddy substrata; polychaetes, particularly spionids and syllids, ostracods, amphipods, bivalves and ophiuroids characterise mud/gravel substrata; and diverse assemblages of polychaetes, bivalves, pagurid cra

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19

Ilmonen, J. (Jari). "Benthic macroinvertebrate and bryophyte assemblages in boreal springs: diversity, spatial patterns and conservation." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514290633.

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Abstract In this thesis, I studied the patterns in the assemblage composition as well as the biogeography and ecology of spring macroinvertebrates and bryophytes in Finland. My main objectives were to assess the importance environmental variables to macroinvertebrate and bryophyte assemblage composition in springs at the level of multiple spatial scales. In addition, I assessed the importance of springs in the boreal mire landscape, and sought the ecological and environmental determinants of a key species in boreal springs. In a large-scale study, I also examined the concordance between macroi

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20

Alves, Fábio Rui Lima. "Traits of benthic assemblages subjected to different trawling pressure." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12618.

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Mestrado em Biologia Marinha<br>Over time, fishing techniques improved as a response to the needs of Human populations. Alongside with the increase of fishing activities important changes in the marine ecosystems were also observed (e.g. overexploitation of stocks and habitat loss or degradation). Overfishing, bycatch, discards and ghost-fishing are some of the most discussed impacts of fishing activities, but the effect of bottom trawling should not be underestimated, since it has been proven to have a significant impact of benthic communities. Up to now the knowledge about fisheries impac

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21

Angulo, Preckler Carlos. "Biodiversity and Chemical Interactions in Antarctic Benthic Communities of Deception Island (South Shetland Islands) = Biodiversidad e Interacciones Químicas en las comunidades bentónicas Antárticas en Isla Decepción." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/385350.

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This Thesis covers two different topics in Antarctic marine benthic invertebrates. The two main goals are: 1) to improve the knowledge of the biodiversity of the shallow water benthic communities inside Deception Island (South Shetland Islands, Antarctica), and 2) to establish the chemical ecology of selected Antarctic organisms, by studying the antifouling and antimicrobial activity of their organic extracts. Deception Island is an active volcano on the southwestern end of the South Shetland Island chain. This island chain parallels the northeastern curvature of the Antarctic Peninsula

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22

Hill, Ryan A. "Modeling USA stream temperatures for stream biodiversity and climate change assessments." Thesis, Utah State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3587567.

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<p> Stream temperature (ST) is a primary determinant of individual stream species distributions and community composition. Moreover, thermal modifications associated with urbanization, agriculture, reservoirs, and climate change can significantly alter stream ecosystem structure and function. Despite its importance, we lack ST measurements for the vast majority of USA streams. To effectively manage these important systems, we need to understand how STs vary geographically, what the natural (reference) thermal condition of altered streams was, and how STs will respond to climate change. Empiric

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23

Taboada, Moreno Sergio. "Antarctic marine benthic invertebrates: chemical ecology, bioactivity and biodiversity / Invertebrados bentónicos marinos de la Antártida: ecología química, bioactividad y biodiversidad." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/83921.

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Esta tesis cubre diferentes aspectos de los invertebrados marinos bentónicos de la Antártida. Se trata de una tesis multidisciplinar presentada en formato artículos en la que se hacen las siguientes aportaciones: (i) por un lado se hace una revisión de los productos naturales de origen animal y vegetal descritos hasta Mayo de 2007 en las aguas de la Antártida. En dicha revisión se hace especial énfasis en el papel que juegan los productos naturales en el contexto de su ecosistema; (ii) se aportan también datos sobre experimentos de repelencia alimentaria en los que se utilizaron extractos lipo

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24

Busse, Svenja. "Benthic diatoms in the Gulf of Bothnia : Community analysis and diversity." Doctoral thesis, Uppsala University, Plant Ecology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2591.

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<p>Benthic diatoms are valuable tools for biological monitoring and paleo-ecological reconstruction of past environmental conditions. This thesis aims at describing size-related properties of benthic diatoms and suggests that data assessment for community analysis can be improved by considering the importance of scale. It investigates which environmental factors structure epilithic diatom communities on the coast of the Gulf of Bothnia and identifies environmental factors correlated with phytobenthic biomass. It also contributes to the floristic knowledge of the Baltic Sea. </p><p>Diatom speci

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Sommer, Christian. "Processes and factors governing benthic community dynamics—environmental change in the Baltic Sea." Licentiate thesis, Södertörns högskola, Miljövetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-39750.

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As drivers of biogeochemical cycles and nutrient recycling, such as carbon turnover, the microbial community is essential in sustaining functioning ecosystems. Together with the metazoan community, the microbial community constitute the majority of all life in the benthos. Environmental change in biotic and abiotic factors may influence the dynamics of these communities, for example through a sorting or driving effect on the community structure through assembly processes. Environmental change, e.g. change in dissolved oxygen concentration, salinity and temperature, can directly or indirectly a

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26

Suurkuukka, H. (Heli). "Spatial and temporal variability of freshwater biodiversity in natural and modified forested landscapes." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526207087.

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Abstract Understanding of natural and human induced changes to freshwater biodiversity patterns is critical for efficiently conserving and managing these highly impacted ecosystems. In this doctoral thesis, I study the natural spatial and temporal variability of littoral macroinvertebrate communities, as well as aquatic biodiversity responses (of bryophytes, macroinvertebrates and diatoms) to human impact on forested headwater streams. I also study the temporal variability of natural and human-impacted stream communities. I show that littoral macroinvertebrate communities are most variable bet

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27

Fisco, Dana. "Reef Fish Spatial Distribution and Benthic Habitat Associations on the Southeast Florida Reef Tract." NSUWorks, 2016. http://nsuworks.nova.edu/occ_stuetd/408.

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The Florida Reef Tract (FRT) extends from the tropical Caribbean up the southeast coast of Florida into a temperate environment where tropical reef assemblages diminish with increasing latitude. This study used data from a three-year comprehensive fishery-independent survey to quantify reef fish spatial distribution along the Southeast FRT and define where the assemblage shifts from tropical to temperate. A total of 1,676 reef fish visual census samples were conducted to assess the populations on a stratified-random selection of sites of marine hardbottom habitats between the Miami River and S

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28

Pulliam, Lauren. "Biodiversity and Genetic Structure of Benthic Macroinvertebrates Along an Altitudinal Gradient: A Comparison of the Windhond and Róbalo River Communities on Navarino Island, Chile." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849782/.

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Altitudinal gradients in Sub-Antarctic freshwater systems present unique opportunities to study the effect of distinct environmental gradients on benthic macroinvertebrate community composition and dispersal. This study investigates patterns in biodiversity, dispersal and population genetic structure of benthic macroinvertebrate fauna across an altitudinal gradient between two watersheds on Navarino Island in southern Chile. Patterns in diversity, density, evenness and functional feeding groups were not significantly different across the altitudinal gradient in both the Windhond and Róbalo R

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Huttunen, K. L. (Kaisa-Leena). "Biodiversity through time:coherence, stability and species turnover in boreal stream communities." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211602.

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Abstract Describing how and why species composition of ecological communities varies across spatial and temporal scales is a primary objective for ecological research. A key challenge is to distinguish changes in community composition resulting from external factors from the natural background variability. In this thesis I aimed to study: 1) the level of temporal variation in community composition of stream macroinvertebrates, 2) the role of different environmental factors to temporal variability, 3) the effect of temporal variability on bioassessment outcomes, and 4) comparability of differen

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Näslund, Johan. "The importance of biodiversity for ecosystem processes in sediments : experimental examples from the Baltic Sea." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38893.

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Aquatic sediments are, by surface, the largest habitat on Earth. A wide diversity of organisms inhabit these sediments and by their actions they have a large influence on and also mediate many ecosystem processes. Several of these processes, such as decomposition and remineralisation of organic matter are important on a global scale and are essential to sustain life on Earth. The main aim of this thesis was to use an experimental ecosystem ecology approach in order to study some of these ecosystem processes in marine sediments and how they are linked to biodiversity. Paper I and II found that

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Tolkkinen, M. (Mikko). "Biodiversity and ecosystem functioning in boreal streams:the effects of anthropogenic disturbances and naturally stressful environments." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526209043.

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Abstract The effect of biodiversity loss and change on the functioning of ecosystems is one of the key questions in ecological research. For stream ecosystems, compelling evidence indicates that species diversity may enhance ecosystem functions. However, ecosystem functions are often regulated by the same environmental factors that also shape diversity; thus, a major challenge for ecologists is to separate the effects of biodiversity loss on the ecosystem functions from the direct effects of human induced disturbance. In this doctoral thesis, I studied how decomposer communities and ecosystem

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Angulo, Preckler Carlos. "Biodiversity and Chemical Interactions in Antartic Benthic Communities of Deception Island (South Shetland Islands) = Biodiversidad e Interacciones Químicas en las comunidades bentónicas Antárticas en Isla Decepción." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/385350.

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This Thesis covers two different topics in Antarctic marine benthic invertebrates. The two main goals are: 1) to improve the knowledge of the biodiversity of the shallow water benthic communities inside Deception Island (South Shetland Islands, Antarctica), and 2) to establish the chemical ecology of selected Antarctic organisms, by studying the antifouling and antimicrobial activity of their organic extracts. Deception Island is an active volcano on the southwestern end of the South Shetland Island chain. This island chain parallels the northeastern curvature of the Antarctic Peninsula, bu

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Tamai, Stefano. "Effect of in situ eutrophication on carbon metabolism and DOC fluxes in benthic coastal communities of Cymodocea nodosa and Caulerpa prolifera in the Bay of Cádiz." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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In this study the communities of two species of macrophytes, Cymodocea nodosa and Caulerpa prolifera were subjected to a treatment of nutrient enrichment for three months with the aim to reproduce the conditions of marine eutrophication. After the incubation period were evaluated the effects of this in situ eutrophication on community metabolism (NCP, R, GPP), DOC release rates, biomass of the whole plant, leaves, rhizomes, roots and the associated fauna, biodiversity of the faunal assemblages. Results of community metabolism analysis indicate an increase of NCP of 20% in Cymodocea nodosa and

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Turunen, J. (Jarno). "Responses of biodiversity and ecosystem functions to land use disturbances and restoration in boreal stream ecosystems." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526217826.

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Abstract Streams and rivers have been extensively altered by humans. Channelization and land use have changed stream habitats and water quality with adverse effects on biota and ecosystem functions. Impacted streams have been targets for restoration, but there is considerable lack of understanding how streams should be restored in an ecologically effective way. In this doctoral thesis, I studied the impacts of channelization (for timber floating) and agricultural diffuse pollution on stream biota. I also studied the effectiveness of restorations of forestry impacted streams stressed by excessi

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Doeser, Anna. "Refining biological monitoring of hydromorphological change in river channels using benthic riverfly larvae (Ephemeroptera, Plecoptera and Trichoptera)." Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/25238.

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Rivers and their catchments are under mounting pressure from direct channel modification, intensification of land use, and from a legacy of decades of channelisation. Recent legislation, in the form of the EU Water Framework Directive, places a greater emphasis on the management of water bodies as holistic systems, and includes the explicit consideration of hydromorphological quality, which describes the hydrologic and geomorphic elements of river habitats. These are defined specifically as hydrological regime, river continuity and river morphology. This appreciates that sediment and flow regi

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Netto, Luiz Fernando. "\"Echinodermata do Canal de São Sebastião, São Sebastião (SP)\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/41/41133/tde-12092007-152035/.

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O conhecimento da biodiversidade é vital para o planejamento e implementação de programas de conservação. Para isso, os levantamentos faunísticos são de extrema importância, principalmente quando enfocam grupos historicamente negligenciados no Brasil e realizados em regiões com intensa ação antrópica, como a região do Canal de São Sebastião (23o41\' S - 45o19\' W e 23o54\' S - 45o30\' W). Considerando que os Echinodermata, inclusive na região, representam grande parte da comunidade de macro-invertebrados do bentos marinho, torna-se estrategicamente importante a obtenção de dados sobre os repre

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Robert, Alexandre. "Effets combinés des facteurs naturels et anthropiques sur la diversité fonctionnellle des vasières à langoustines (Nephrops norvegicus) du golfe de Gascogne." Thesis, Rennes, Agrocampus Ouest, 2017. http://www.theses.fr/2017NSARH101/document.

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Cette thèse participe à accroitre les connaissances sur les facteurs régissant la structures des communautés benthiques de la Grande Vasière (GV) du Golfe de Gascogne. Une attention particulière a été portée au rôle du chalutage de fond, dont l’intensité a été estimée à l’aide des données VMS. A l’échelle de la GV, nos résultats suggèrent que le chalutage de fond serait le principal moteur de structuration du mégabenthos (> 10 mm). Cependant, cette hypothèse n’a pu être formellement démontrée en raison de la co-variation entre l’activité de pêche et certaines caractéristiques environnementa

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Johnson, Gareth Edward Luke. "Facilitation and biodiversity in the marine benthos." Thesis, Bangor University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516111.

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Lucca, José Valdecir de. "Caracterização limnológica e análise de comunidades bentônicas sujeitas à invasão por espécies exóticas, em lagos do Vale do Rio Doce, MG, Brasil." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-09112006-102228/.

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Os macroinvertebrados bentônicos são importantes componentes nos ecossistemas aquáticos devido à sua participação no fluxo de energia e na ciclagem de nutrientes, recebendo gradativamente maior atenção nos estudos ecológicos nas últimas décadas. O presente estudo visa uma caracterização limnológica comparativa de quatro lagoas do sistema de lagos do Vale do Rio Doce, MG (lagoas Águas Claras, Almécega, Verde e Carioca), e o estudo dos macroinvertebrados bentônicos, com ênfase na composição taxonômica, distribuição espaçotemporal e diversidade, além de uma avaliação de possíveis relações com a o

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Figuerola, Balañá Blanca. "Biodiversity and Chemical ecology in Antarctic bryozoans = Biodiversitat i ecologia química de briozous antàrtics." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/129165.

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The current thesis covers two important and poorly known aspects of Antarctic bryozoans: biodiversity and chemical ecology. The comparative analyses of diversity carried out here (Chapters 1 and 2) between Antarctica and the last separated fragments of Gondwana support the hypothesis of the sequential separation of Gondwana. We discuss that the high number of species from the Argentine Patagonian (AP) region shared with Antarctica found in our study question the real extent of Antarctic isolation for cheilostome bryozoans. The presence of shared common bryozoan species between these two region

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Fortunato, Humberto Freitas de Medeiros. "Biodiversidade e dinâmica estrutural de assembleias de esponjas marinhas (Filo Porifera) da Ilha Grande e cercanias, Rio de Janeiro, Brasil." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=9043.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Estudos de comunidades de esponjas marinhas são escassos no Brasil, sendo este trabalho pioneiro nessa abordagem para a Ilha Grande - RJ, um local de alta diversidade biológica. A estrutura das assembleias de esponjas marinhas e da comunidade bentônica marinha séssil foi avaliada, a partir de índices descritores de diversidade, em seis pontos da Ilha Grande e ilhas próximas, sendo três do lado continental e três do lado oceânico. As assembleias foram comparadas entre os diferentes lado e profundidade, através da contagem do número

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Dyson, Kirstie Elizabeth. "Biodiversity and ecosystem processes in heterogeneous environments /." St Andrews, 2008. http://hdl.handle.net/10023/698.

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Tolonen, K. (Katri). "Taxonomic and functional organization of macroinvertebrate communities in subarctic streams." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526217673.

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Abstract Ecological research based on both species and their traits help us to understand the main mechanisms and environmental factors structuring biological communities. In general, variation in community composition is thought to be a consequence of both stochastic and deterministic factors. In stream ecology, the traditional view has been that the local habitat conditions pose a strong environmental filter that selects only species with the right functional traits into the local communities. However, recent studies on streams have also suggested that the responses of species to environment

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Alexandridis, Nikolaos. "Modélisations des mécanismes généraux d'assemblage des communautés pour simuler la dynamique spatio-temporelle de la biodiversité benthique." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0031/document.

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Les macroinvertébrés benthiques entretiennent un ensemble complexe d’interactions. Les échelles spatiales et temporelles des processus formant la base de ces interactions ont traditionnellement limité leur étude empirique. Le premier chapitre du manuscrit tente une revue des outils de modélisation utilisés dans l’étude du benthos marin.Même si l’implémentation d’un modèle mécaniste semble s’ajuster aux communautés benthiques, son utilisation nécessite la création d’un nombre limité d’entités avec un rôle fonctionnel clair. Le second chapitre du manuscrit utilise l’hypothèse des groupes émergen

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Stenert, Cristina. "Estrutura da comunidade de invertebrados aquáticos em arrozais do Rio Grande do Sul." Universidade Federal de São Carlos, 2009. https://repositorio.ufscar.br/handle/ufscar/1627.

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Made available in DSpace on 2016-06-02T19:29:12Z (GMT). No. of bitstreams: 1 2388.pdf: 3169628 bytes, checksum: 43b1e64c7e8fa25349e87dc551dfc537 (MD5) Previous issue date: 2009-02-17<br>Universidade Federal de Sao Carlos<br>Wetlands are prioritary ecosystems for conservation due to their vast biological diversity and productivity, besides their many functions and value. In southern Brazil conservative data show that about 90% of the original wetlands are already destroyed due to agricultural expansion, mainly the irrigated rice fields. On the other hand, rice is the most important cereal gro

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Hasemann, Christiane. "Kleinskalige Heterogenität in der arktischen Tiefsee : Einfluss kleiner Kaltwasser-Schwämme auf die Diversität benthischer Nematoden-Gemeinschaften = Small scale heterogeneity in the Arctic deep sea /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2006. http://www.gbv.de/dms/bs/toc/513119086.pdf.

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David, Rhian. "An investigation of biodiversity patterns and processes in nematode populations of Loch Ness." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243163.

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Song, Mi-Young. "Ecological quality assessment of stream ecosystems using benthic macroinvertebrates." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/224/.

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Dans cette étude, nous avons appliqué le modèle SOM (Self-Organizing Map) pour une évaluation de la qualité écologique de l'écosystème aquatique en se basant sur les macroinvertébrés benthiques. D'abord, dans le chapitre I, le SOM a été utilisé pour extraire les informations à partir de grandes matrices de données complexes de variables environnementales et des macroinvertébrés benthiques des différents microhabitats. Bien que les échantillonnages aient e��té réalisés dans une zone limitée, le patron des variables environnementales révèle une hétérogénéité spatiale. Les classes de macroinverté

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Lehosmaa, K. (Kaisa). "Anthropogenic impacts and restoration of boreal spring ecosystems." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526218533.

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Abstract Human activities have increasingly altered freshwater ecosystems. Land use is a major driver of habitat loss and land use-related input of nutrients and other pollutants from agriculture, forestry and urbanization have deteriorated water quality. Freshwater research has mainly focused on lakes and streams while the effects of anthropogenic stressors on groundwater-dependent ecosystems (GDEs) are poorly known. Likewise, the effectiveness of ecological restoration in mitigating human disturbance in GDEs remains understudied. In this thesis, I studied the effects of two main anthropogeni

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Mustonen, K. R. (Kaisa-Riikka). "Climate change and boreal rivers:predicting present-day patterns and future changes in hydrological regime and its effects on river communities." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214184.

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Abstract Although flow regime is a key element in determining the structure and function of lotic ecosystems, little is known about the variation of natural flow regimes and its relation to biological communities in highly seasonal northern boreal rivers. Temperature and precipitation patterns at northern latitudes are predicted to change drastically in the future causing severe effects on stream ecosystems. Interactions between climate change impacts and land use might further create unpredictable environmental stress. In this thesis, I first assessed the relationship of natural flow regimes

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