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Dissertations / Theses on the topic 'Predatory animals'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Hill, Jennifer Marie. "Predator biomass and habitat characteristics affect the magnitude of consumptive and non-consumptive effects (NCEs): experiments between blue crabs, mud crabs, and oyster prey." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41172.

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Recent research has focused on the non-lethal effects of predator intimidation and fear, dubbed non-consumptive effects (NCEs), in which prey actively change their behavior and habitat use in response to predator chemical cues. Although NCEs can have large impacts on community structure, many studies have ignored differences in predator population structure and properties of the natural environment that may modify the magnitude and importance of NCEs. Here, I investigated the roles of predator size and density (i.e. biomass), as well as habitat characteristics, on predator risk assessment and
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2

Wilson, Rory Paul. "Breeding Jackass Penguins as pelagic predators." Doctoral thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/17653.

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Bibliography: pages 187-191.<br>The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass Penguins at sea. I built electronic and autoradiographic remote-sensing devices to measure swimming speed, distance travelled and time spent at each depth by foraging Jackass Penguins. Penguin swimming speed was reduced in proportion to the cross-sectional area of the devices
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3

Ddumba, Hassan. "Repulsive-attractive models for the impact of two predators on prey species varying in anti-predator response." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/d1010995.

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This study considers the dynamical interaction of two predatory carnivores (Lions (Panthera leo) and Spotted Hyaenas (Crocuta crocuta)) and three of their common prey (Buffalo (Syncerus caffer), Warthog (Phacochoerus africanus) and Kudu (Tragelaphus strepsiceros)). The dependence on spatial structure of species’ interaction stimulated the author to formulate reaction-diffusion models to explain the dynamics of predator-prey relationships in ecology. These models were used to predict and explain the effect of threshold populations, predator additional food and prey refuge on the general species
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Philpott, Evelyn. "Examining potential effects of marine renewable energy developments on top predators." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210583.

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This thesis uses data collected over three summers in 2010, 2011 and 2012 at the Isle of May National Nature Reserve, Scotland to examine top predator presence and behaviour in a moderately fast tidal stream site. Fieldwork consisted of an intensive land based observation survey of seabirds at sea, acoustic monitoring of small cetaceans and the deployment of a suite of oceanographical tools to simultaneously collect data on a fine temporal scale over a study area of ~1.5km2. The aim of the study was to examine the potential effects of marine renewable energy developments on top predator behavi
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5

Gross, Lee M. "Long-term assessment of predatory fish removal on a pond-breeding amphibian community in central Illinois /." View online, 2009. http://repository.eiu.edu/theses/docs/32211131565136.pdf.

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6

Smith, Derek, and n/a. "Movements, population dynamics and predatory behaviour of stoats inhabiting alpine grasslands in Fiordland." University of Otago. Department of Zoology, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070330.160940.

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Stoats are introduced mammalian carnivores implicated in the decline of several of New Zealand�s endemic species. Most research into stoats in New Zealand has focused on beech forest habitat, especially in years of peak stoat abundance following heavy beech seedfall and peak cohorts of mice. In New Zealand, alpine grasslands occur above the altitudinal limit of beech forest (900-1000 m a.s.l.). Although previous research has shown stoats to be present there, little is known about the ecology of stoats in alpine grasslands. This research aimed to test whether alpine grasslands were a marginal h
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7

Tarantino, William J. "Effects of Adaptive Foragers on the Diversity and Functioning of Assembled Model Communities." W&M ScholarWorks, 2008. http://www.vims.edu/library/Theses/Tanantino08.pdf.

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8

Meyer, David L. "Comparison of nekton utilization of smooth cordgrass (Spartina alterniflora) marsh based on marsh size and degree of isolation from like habitat : do size and site location matter? /." Electronic version (PDF), 2006. http://dl.uncw.edu/etd/2006/meyerd/davidmeyer.pdf.

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9

Starling, Amanda. "Behavioural plasticity of life history traits in the New Zealand avifauna." Thesis, University of Canterbury. Biological Sciences, 2006. http://hdl.handle.net/10092/1327.

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The purpose of this research was to determine how predator control influences nest survival and changes in life history strategies of birds. All studies were conducted at two sites: one site had very little mammal control, while the other site is a 'mainland island' in which all introduced mammals were trapped or poisoned. Nest survival rates of introduced and native species were compared between the two sites by locating and monitoring nests of nine species. I found that mammalian predator control increased nest survival rates of both introduced and native species, but the incrase of nest
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10

Leaver, Jessica. "Options for eland: a multi-scale assessment of antipredatory responses of a vulnerable prey species to their dominant predator in the Eastern Cape, South Africa." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/6570.

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Eland Tragelaphus oryx are the largest and slowest African antelope, falling within the preferred weight range of the prey of lions Panthera leo. Little is known, however, about the antipredatory strategies employed by eland. Rapid population declines in several small reserves following the reintroduction of lions suggest that the antipredatory strategies of eland may be compromised in spatially limited areas. This emphasises the need for research aimed at investigating how eland respond to lions, particularly in the spatial context, given that lions are increasingly being reintroduced into sm
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11

Klein, Rebecca Ann. "An assessment of human carnivore conflict in the Kalahari region of Botswana." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013132.

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Human wildlife conflict is a considerable conservation challenge that threatens many carnivore species worldwide and is a result of complex socio-economic and ecological processes. An understanding of the drivers of conflict is essential for any efforts to achieve coexistence. This study investigated the levels of conflict, livestock management and tolerance amongst the farming communities of the Southern and Western Kalahari in Botswana. A questionnaire survey was completed with 310 farmers throughout the region. The majority of respondents regarded coexisting with carnivores as a challenge,
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12

Gaines, Eleanor Prindiville. "Snowy Plover Demography in Oregon." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5004.

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A thorough understanding of demographic parameters and their contribution to overall population growth is fundamental to effective conservation of small populations, but this information is often lacking. The Pacific Coast population of the Western Snowy Plover (Charadrius nivosus nivosus) is listed as threatened and has been the target of long-term, multi-pronged management in Oregon. The Oregon coastal population has been intensively monitored since 1990, and over 80% of the population is color banded, but a comprehensive analysis of demographic parameters and the effect of management on vit
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13

Freire, Mirella Renata de Lira. "Determinação do padrão de interação entre predador (Cryptolaemus montrouzieri) e presa (Cochonilha do Carmim) usando equações de de Lotka-Volterra." Universidade Católica de Pernambuco, 2012. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=826.

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O uso de ferramentas matemáticas e computacionais se faz cada vez mais presente nos estudos da dinâmica predador-presa devido à complexidade das populações que sofrem influências externas relativas à interação com o ambiente. O objetivo deste estudo foi investigar as equações de Lotka-Volterra e aplicá-las para modelar e descrever a dinâmica da interação entre o inseto Cryptolaemus montrouzieri (predador) e sua presa, a cochonilha-do-carmim (Dactylopius opuntiae) visando identificar cenários que conduzam ao combate da cochonilha. Esta é uma praga que tem atacado severamente as áreas de cultivo
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14

Makin, Douglas Ferguson. "How does the ungulate community respond to predation risk from cheetah (Acinonyx jubatus) in Samara Private Game Reserve?" Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1018461.

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Predator reintroductions are becoming increasingly more common for multiple reasons, including assisting with the conservation of a predator species, the restoration of ecosystem functions and the economic benefits of their reintroduction for ecotourism ventures. There remains however, little knowledge on prey species responses to these predator reintroductions. As such, the reintroduction of cheetah (Acinonyx jubatus) into Samara Private Game Reserve provided an opportunity to investigate prey responses to predator reintroduction across a range of spatial and temporal scales. More specificall
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15

Nobel, Laura Briana. "The Nature of People's Perceptions of Wolves." PDXScholar, 2009. https://pdxscholar.library.pdx.edu/open_access_etds/2683.

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European immigrants once regarded wolves as the "devil in disguise" (Lopez, 1978, p.40). With our growing awareness of other cultural perspectives and flourishing body of scientific knowledge with regard to wolves' behavior, our perceptions of wolves have become more complicated and nuanced. Our collective awareness of the environment in which we live also gathers complexity. I examine these issues in this study. Wolves are returning to Oregon. The arrival of wolf B-45 in 1999 heralded the beginning of the return of wild wolves to Oregon. More wolves are expected to cross the border as young s
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16

Smith, Emma Ruth. "An assessment of caracal population density and human-predator conflict in the Winterberg, Eastern Cape, South Africa." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005326.

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Human-wildlife conflict frequently involves carnivores, mainly because of their large home ranges and dietary requirements. As such, carnivores tend to be the first animals to be lost in human-dominated ecosystems. This is significant because the removal of carnivores can alter the functionality of ecosystems. However, the conservation of carnivores depends as much on the socio-political and socio-economic landscapes as it does on the ecological one. The consolidation of vast, un-fragmented conservation areas in Africa and the world is unlikely. Thus, unravelling the factors (both biological a
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17

Russell, Benjamin Gallard School of Biological Earth &amp Environmental Sciences UNSW. "The role of odour in Australian mammalian predator/prey interactions." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2005. http://handle.unsw.edu.au/1959.4/25144.

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Odour plays an important role in many predator/prey interactions. In the northern hemisphere, many mammalian prey species have been shown to respond to predator odours. It is also widely assumed that mammalian predators utilise odours to locate their prey. This thesis explores the importance of odour in Australian mammalian predator/prey interactions. Responses of native Australian species to the faecal odour of two predators; the native tiger quoll Dasyurus maculatus and the introduced red fox Vulpes vulpes, were evaluated through live-trapping and focussed behavioural studies of captive anim
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18

Jarnemo, Anders. "Neonatal mortality in roe deer /." Uppsala : Dept. of Conservation Biology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s321.pdf.

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19

Murison, Megan Kate. "The roles of black-backed jackals and caracals in issues of human-wildlife conflict in the Eastern Cape, South Africa." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018667.

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[Partial abstract]: Human-wildlife conflict is a widely observed phenomenon and encompasses a range of negative interactions between humans and wildlife. Depredation upon livestock and game species proves to be the prevalent form of this conflict and often results in the killing of carnivores. Within the South African context, despite intense lethal control, two sympatric mesopredators, the blackbacked jackal (Canis mesomelas) and the caracal (Caracal caracal), remain common enough to be considered a major threat to human livelihoods through depredation. Wildlife ranches and livestock farms do
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20

Alvarez, Ariane Dias. "Predação de ninhos artificiais: aplicações, desafios e perspectivas para as áreas tropicais." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-28082007-094458/.

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A predação de ninhos naturais vem sendo sugerida a principal causa do declínio de populações de aves, influenciando na estrutura e no funcionamento das comunidades. Devido à dificuldade de localização e monitoramento dos ninhos naturais, os ninhos artificiais são utilizados como uma rápida alternativa para avaliar o sucesso reprodutivo da avifauna. Os estudos com ninhos artificiais são amplamente difundidos em ambientes temperados e o que conhecemos sobre a predação de ninhos são provenientes destes ambientes. Nos trópicos, os estudos com ninhos artificiais ainda são escassos e no Brasil são q
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21

Speed, Michael Patrick. "Mimicry and the psychology of predation." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278364.

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22

Taylor, Ryland. "Using geomorphology and animal “individuality” to understand ‘scape-scale predator distributions." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/38227.

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Master of Science<br>Department of Biology<br>Martha E. Mather<br>Determining patterns and drivers of organismal distribution and abundance are fundamental and enduring challenges in ecology, especially for mobile organisms at a ‘scape scale. To address the problem presented by individuals whose distributions are dynamic across large geographic areas, here I tracked 59 acoustically-tagged migratory striped bass (Morone saxatilis) with an array of 26 stationary receivers in Plum Island Estuary (PIE), MA. Specifically, I asked (1) how these predators were distributed across the estuarine seasc
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23

Paltridge, Rachel M. "Predator-prey interactions in the spinifex grasslands of central Australia." School of Biological Sciences - Faculty of Science, 2005. http://ro.uow.edu.au/theses/255.

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Predation by exotic predators (cats Felis catus and foxes Vulpes vulpes) is believed to be one of the factors that has contributed to the decline of medium-sized mammals in arid Australia. Other factors include habitat degradation by introduced herbivores (rabbits Oryctolagus cuniculus and grazing stock) and altered fire regimes after Aboriginal people moved into permanent settlements. In general, the impact of exotic predators on arid zone mammals is believed to be significant only when predator numbers have been elevated by increased food availability from exotic prey species (rabbits, house
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24

Neal, Orin J. "Responses to the audio broadcasts of predator vocalizations by eight sympatric primates in Suriname, South America." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1245291915.

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Thesis (M.A.)--Kent State University, 2009.<br>Title from PDF t.p. (viewed Jan. 26, 2010). Advisor: Marilyn Norconk. Keywords: predation; anti-predator strategies; alarm calls. Includes bibliographical references (p. 111-120).
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Cordes, Line Søltoft. "Demography and breeding phenology of a marine top predator." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=183669.

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Worldwide harbour seal populations are showing differing and fluctuating trends in abundance, but the drivers of change remain uncertain. Within the Moray Firth, NE Scotland, count surveys carried out over the last 20 years highlighted the development of a new breeding site, providing a unique opportunity to carry out an individual-based study of harbour seal demography and pupping phenology using photo-identification techniques within a mark-recapture framework. Sightings of individual seals suggested that a large proportion of harbour seals are year-round residents at haul-out sites. Both se
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26

Gray, Christopher Anthony. "The role of a symbiotic bryozoan in the chemical ecology of a marine benthic predator-prey interaction." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1005444.

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The subtidal whelk Burnupena papyracea (Brugière) co-occurs with a voracious predator, the rock lobster Jasus lalandii (Milne Edwards), in situations where other potential prey are largely eliminated. This has been ascribed to a symbiotic bryozoan, Alcyonidium nodosum (O’Donoghue and de Watteville), which characteristically encrusts the shells of B. papyracea and deters feeding by Jasus. In this study it is shown that this is not due to physical effects of either induced physical defences in the bryozoan or increased shell strength due to the presence of the bryozoan. Neither spectroscopic scr
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27

Dohet, Loïc. "Coevolution in the specific predator-prey system Rhizophagus grandis-Dendroctonus micans: with emphasis on the predator’s oviposition kairomones and prey symbioses." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/232990.

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Rhizophagus grandis is one of the rare examples of totally specific predators: it only preys upon the bark beetle Dendroctonus micans in its native range (Europe and Asia). In the course of coevolution in such predator-prey systems, prey are selected for avoidance and resistance mechanisms against predators. Previous laboratory trials suggested that R. grandis could lay more eggs in presence of exotic prey species with an ecology similar to that of D. micans, but which could not evolve resistances against this predator, such as the North American parasitic bark beetles D. punctatus and D. vale
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Guilford, T. "Aposematism." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382678.

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29

Connolly, Lauren E. "Effect of predator diet on foraging behavior of panopeus herbstII in response to predator urine cues." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/53392.

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The ability of prey to detect and respond appropriately to predator risk is important to overall prey fitness. Many aquatic organisms assess risk through the use of chemical cues that can change with predator diet. Two variable characteristics of diet are: 1. prey type and 2. prey mass. To assess the effect of these two characteristics on the assessment of risk by the mud crab Panopeus herbstii, I exposed mud crabs to the urine of the blue crab Callinectes sapidus fed one of 5 diet treatments: 10g of oyster shell free wet mass, 5g of oyster shell free wet mass, 10g crushed mud crabs, 5
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30

Clements, Hayley Susan. "Incorporating prey demographics and predator social structure into prey selection and carrying capacity estimates for cheetah." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1018606.

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There is a need for a refined understanding of large carnivore prey preference and carrying capacity (K). To date, K estimates for large carnivores have been developed from predictions of carnivore diet at a prey and predator species-level. These predictions therefore assume that all social classes within a carnivore species display similar prey preferences and that all demographic classes within a prey species are equally preferred or avoided. The objective of this study was to investigate the importance of including prey demographics and carnivore social class in carnivore diet descriptions
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31

Nordström, Jonas. "Temporal and spatial variation in predation on roe deer fawns /." Uppsala : Dept. of Ecology, Swedish University of Agricultural Sciences, 2010. http://epsilon.slu.se/201006.pdf.

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32

McLaughlin, Robert L. (Robert Louis). "Quantitative studies of the variation in movement patterns used by predators." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74662.

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A literature review shows that qualitative dichotomies describing interspecific differences in the movement patterns of foraging animals are widely-used and biologically important, but fraught with ambiguity. Consistent use of the terminology from foraging theory and stronger quantification are proposed to increase clarity and facilitate more rigorous tests of hypotheses. Greater consideration of intraspecific variation is also needed. In forest bird and lizard communities, move-frequency distributions are bimodal, supporting a dichotomous view, but there is important variation within the stat
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33

Hart, Julie A. "Foraging in patches : the effect of encountering a predator in a formerly risk-free environment /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841146.

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Torok, Alexandra. "Halting attack : startle displays and flash coloration as anti-predator defences." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709452.

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Pagani, Jerome H. "The medial hypothalamic defensive circuit and predator odor-induced fear a comparison of electrolytic and neurotoxic lesions /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 127 p, 2007. http://proquest.umi.com/pqdweb?did=1397903941&sid=8&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Plaisted, K. C. "Stimulus detection and representation : implications for search image." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360607.

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37

Phillips, Molly A. "Snake harassment in the Cape ground squirrel (Xerus inauris): variation in anti-predator behaviours, predator discrimination and venom resistance in a facultative cooperative breeder." Toxicon, 2012. http://hdl.handle.net/1993/9223.

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Predator harassment is an anti-predator behaviour that may increase a harasser’s risk of predation but decrease the potential for predation for other members of a group. The Cape ground squirrel (Xerus inauris) is a facultative cooperative breeder from southern Africa that harasses venomous snakes. The objective of my study was to examine predator harassment to determine: 1) whether predator harassment was part of alloparental care by comparing harassment behaviour among age and sex classes; 2) how individuals adjusted their behaviour against different snake species; 3) whether olfaction was u
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Digweed, Shannon Marie, and University of Lethbridge Faculty of Arts and Science. "The functions and mechanisms of predator-associated vocalisations in North American red squirrels (Tamiasciurus Hudsonicus)." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Psychology, c2009, 2009. http://hdl.handle.net/10133/2474.

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North American red squirrels are a solitary, territorial species that confront various predators. Previous research proposed that squirrels produce predator-specific, referential ‘seet’ and ‘bark’ alarm calls to aerial and ground predators, respectively. To test this hypothesis, I examined alarm call production during natural encounters with predators, conspecific intruders and in a series of predator simulation experiments. Call production patterns were consistent across all types of disturbance and involved protracted bouts where both call types were inter-mixed. Hence, the call types were n
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Fernandes, Fausto Assumpção. "Memória predatória da aranha Argiope argentata: localização e tamanho da presa." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/47/47132/tde-11052009-144032/.

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Aranhas orbitelas realizam comportamentos de busca quando uma presa, fixada no centro ou na periferia da teia, é suprimida. A fim de investigar os componentes da memória predatória relacionados com a localização espacial e com o tamanho da presa, foram realizados três exerimentos com a aranha Argiope argentata (Fabricius, 1775). No Experimento 1, buscou-se saber se haveria diferenças entre as seqüências de busca executadas no caso da supressão de uma mosca fixada no centro e de uma mosca fixada na periferia da teia. No Experimento 2, replicou -se o Experimento 1, usando como presa um fragmento
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Fardell, Loren. "Fear and stressing in the urban environment: landscape of fear effects on small prey animals from predators and human activity." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/27981.

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Wildlife are increasingly being found to persist in fragmented urban habitats. As human populations spread, the trajectory of native animals could depend on management that accommodates their needs in human-dominated habitats. Human activities impose additional stressors to ecosystems. They have been likened to exerting pressures similar to predators, and alter predator-prey interactions via introduced species and influences on predator activity. As such, the objective of my research was to understand if and how small prey animals persist against such stressors in urban environments. First, th
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Beattie, Molly C. "Diet and familiarity influence on predator recognition by chemical cues in crayfish." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1521577265172544.

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Bertsch, David J. "The effects of satiety-state neuromodulation on predatory hunting behaviors and CNS sensorimotor processing in the praying mantis, Tenodera sinensis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1623260572699621.

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43

Ruzicka, Richard Robert. "Sponge community structure and anti-predator defenses on temperate reefs of the South Atlantic Bight." Click here to access thesis, 2005. http://www.georgiasouthern.edu/etd/archive/fall2005/richard%5Fr%5Fruzicka/ruzicka%5Frichard%5Fr%5F200508%5Fms.pdf.

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Thesis (M.S.)--Georgia Southern University, 2005.<br>"A thesis submitted to the Graduate Faculty of Georgia Southern University in partial fulfillment of the requirements for the degree Master of Science" ETD. Includes bibliographical references (p. 74-82) and appendices.
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Klein, Marianne Orlandini. "Papel dos receptores opióides m e k da substância cinzenta periaquedutal (PAG) na seleção comportamental durante a lactação." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/42/42136/tde-26072012-175737/.

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Após o parto, a mãe deve optar por buscar por comida ou cuidar da prole sendo que a substância cinzenta periaquedutal (PAG) é uma área central importante de regulação, seleção e um sítio de ação de opióides. Ainda não se sabe a importância funcional de cada um dos receptores opióides na PAG sobre a expressão dos comportamentos materno e predatório. Foram utilizadas ratas com cânula unilateral implantada na PAG e divididas em dois experimentos: Experimento 1, onde as ratas receberam injeções de agonista m, ou o agonista k, ou sulfato de morfina, ou veículo; Experimento 2, onde receberam antag
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Östergård, Hannah. "Plant-seed predator interactions – ecological and evolutionary aspects." Doctoral thesis, Stockholm University, Department of Botany, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7537.

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<p>Plant-animal interactions are affected by both abundance and distribution of interacting species and the community context in which they occur. However, the relative importance of these factors is poorly known. I examined the effects of predator host range, environmental factors, host plant populations, plant traits and fruit abortion on the intensity of pre-dispersal seed predation in 46 host populations of the perennial herb <i>Lathyrus vernus</i>. I recorded damage by beetle pre-dispersal seed predators, mainly <i>Apion opeticum </i>and <i>Bruchus atomarius</i> with different host ranges
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Penna-Gonçalves, Vanessa. "Evolução da memória em aranhas do grupo Orbiculariae." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/47/47135/tde-19072011-104531/.

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A memória é considerada por muitos pesquisadores como um dos produtos mais fascinantes da evolução biológica, justamente por proporcionar aos animais a vantagem adaptativa de se utilizar de uma experiência prévia para a solução de problemas necessários para a sobrevivência. Os animais se utilizam de processos mnemônicos durante o forrageamento, a seleção de parceiros sexuais, seleção de habitat e a preferência alimentar. As aranhas são um modelo interessante em estudos de memória e há evidências do uso de experiências passadas na otimização do forrageio: a teia permite que as aranhas capturem
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Ontkos, Alex T. "Habitat Use of Three Abundant Predatory Fish Species in the Freshwater Marshes of the Florida Everglades." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3873.

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The Florida Everglades presents a model setting for studying animal-habitat relationships in a dynamic landscape that is heavily influenced by seasonal hydrology and water management. I used dynamic, high-resolution habitat classification maps and radio-telemetry to examine habitat preference of Largemouth Bass, Bowfin, and Florida Gar before and after a field-scale manipulation was established to address uncertainties with Everglades restoration and water management practices. Results indicate preference for the canal habitat by all three species, which represents only a small portion of the
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Nazarian-Trochet, Marlène. "Recherches sur les chasses étrusques, latines et italiques : une préhistoire des chasses romaines ?" Thesis, Paris 10, 2017. http://www.theses.fr/2017PA100023.

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La chasse est l’un des sujets dominant l’iconographie étrusque dès l’émergence des premières représentations figurées. S’intégrant au décor des armes et parures des premières élites protohistoriques, elle s’enrichit bientôt de nouveaux modèles importés des cultures proche-orientales et helléniques dont elle intègre à la fois le bestiaire et les schémas de mise en scène. Cette prédominance des scènes cynégétiques invite à se poser la question de leur utilisation symbolique, sur le mobilier comme sur les monuments publics et privés commandés par les aristocraties étrusques, et conduit à s’interr
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Dritz, Rebekah E. "The Influence of Landscape and Weather on Foraging by Olfactory Meso-predators in Utah." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/725.

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Predation by olfactory meso-predators has a large impact on avian nest success, particularly for ground-nesting waterfowl. Olfactory predators rely on odors to locate their prey. Weather conditions (e.g. wind speed, humidity, and temperature), vegetation, and landscape features affect the dissipation rate of odors and could affect the foraging efficiency of olfactory predators. I conducted 2 studies to determine if weather and landscape impact predator foraging ability and behavior: a predator survey study and an artificial nest study. The objective of the predator survey was to investigate ho
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Guo, Mengyu. "Predator-Induced Changes of the Green Frog (Rana clamitans)'s Diet Preference." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1462821897.

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