Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 129 for “"prey species"”.
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Multi-isotope analysis and the reconstruction of prey species palaeomigrations and palaeoecology
… analysis and intra-tooth sampling to reconstruct prey species ecology and biogeography. Modern caribou (Rangifer tarandus ssp.) and bison (Bison bison) from North America are used to assess the relationship between known lifetime movements and feeding habits, and those reconstructed through the …
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The 2006 Warm Fire: effects on habitat and prey species of the northern goshawk
… goshawks (Accipiter gentilis), a food-limited species of conservation concern, and the birds and mammals it feeds on. A conservation strategy for the species in the goshawk's food web in these forest types recommends restoring the mix of predator and prey habitats that historically …
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The influence of rainfall on the Verreaux's eagle and its prey species in the Matobo hills, Zimbabwe
Understanding how species respond to variations in weather patterns will be crucial to improve our predictions about how species will cope with climate change. The Verreaux's Eagle (Aquila verreauxii) and its primary prey species the Rock Hyrax (Procavia capensis) and Yellow-spotted Hyrax …
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Interpreting Predator – Prey Interactions in Cayuga Lake Fishes Using Fatty Acid Signature Analysis
Fatty acids are transferred from prey to predator and can be used to assess trophic interactions in aquatic food webs. Therefore, to better understand Cayuga Lake food web dynamics, fatty acid signatures (FAS) of lake trout (Salvelinus namaycush) were compared to two major prey species in the lake; …
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A camera trap assessment of factors influencing leopard (Panthera pardus) habitat use in the Nouabalé-Ndoki National Park, Republic of Congo
… anthropogenic factors, most notably loss of prey and habitat conversion. In this study I used a long-term camera trap array that forms part of the Tropical Ecology, Assessment and Monitoring (TEAM) project - Terrestrial Vertebrate (Camera Trapping) Monitoring Protocol, to estimate the species …
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Ecological responses by Mexican spotted owls to environmental variation in the Sacramento Mountains, New Mexico
… requisite for devising strategies that conserve species. A common tactic for conserving raptor populations is to maintain or manipulate habitat conditions that maintain or increase availability of prey species. A primary purpose of this investigation was to evaluate the hypothesis that Mexican …
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The ecology of a recovering native predator: the European pine marten (Martes martes)
… Habitats predators would have existed in, and species predators would have existed alongside are typically highly degraded or entirely absent. Contemporary available habitats are human-modified, and often shared with humans, as well as numerous novel, human introduced species. Although early …
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Resource selection, predation risk, and population dynamics of woodland caribou
… competition dynamics within the predator-prey community. Apparent competition occurs as a negative indirect interaction between prey species, mediated by their direct interactions with a shared predator. I first review apparent competition, and show that across many endangered species …
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Resource selection, predation risk, and population dynamics of woodland caribou
… competition dynamics within the predator-prey community. Apparent competition occurs as a negative indirect interaction between prey species, mediated by their direct interactions with a shared predator. I first review apparent competition, and show that across many endangered species …
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Seasonal and Diurnal Behavioral Patterns of Bottlenose Dolphins, <i>Tursiops truncatus</i>, That Exhibit High Site and Low Site Fidelity to Mississippi Sound
… fidelity groups, which coincides with seasonal prey species migrations. These findings suggest that lower site fidelity dolphins may migrate through the Mississippi Sound to pursue seasonal prey species. Sighting patterns of dolphins suggest the Mississippi Sound is characterized by seasonal …
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Nutrient regulation by an omnivore and the effects on performance and distribution
… and lipid) when fed naturally co-occurring prey (Chapter 2). I first established that the prey differed in their protein and lipid content and that these differences were related to the size of the prey species. When Conocephalus were fed different prey species individuals showed no …
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The Effect of Diet on Venom Gene Expression in Tetragnatha versicolor
… is a habitat generalist means that the species encounters a diverse array of insect prey species throughout its range. The purpose of this study is to determine if two populations of T. versicolor that feed on different insect species also differentially express venom genes. First, I …
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Distribution, diet and kleptoparasitic behaviour of gulls (Aves: Laridae) in the southwestern Cape Province, South Africa
… supports only two common, resident gull species, Hartlaub's Gull Larus hartlaubii and the larger Kelp Gull L. dominicanus. Hartlaub's Gull is endemic to southern Africa and the Kelp Gull that occurs in this region is sub-specifically distinct, L. d. vetula. Although locally abundant, both …
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Food selectivity of Bluegill and Green Sunfish Fry
… by larger green sunfish fry. The mean length of prey species selected for, increased linearly with mean length of green sunfish fry; the food length relation for bluegill fry as the fish increased in size was curvilinear. There were no significant (P>0.05) differences between day and night prey …
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The population status, breeding success and diet of Subantarctic Skuas two decades after the feral cat eradication on Marion Island
Prey availability is often the driver behind predator population trends, diet and breeding success. Changes in predator abundance and breeding success represent numerical responses to changes in prey abundance, whereas dietary shifts can be classified as functional responses. Invasive mammals …
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Prey Selectivity by naticid gastropods from tertiary sediments of the United States coastal Plain
… gastropod predators are highly selective of prey species in accordance with the Kitchell et al. (1981) cost-benefit model. In addition, earlier studies have demonstrated selectivity of drillhole siting and intraspecific prey size. This study focuses on prey selectivity by Oligocene naticid …
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The diet and foraging ecology of chick-rearing gannets on the Namibian islands in relation to environmental features : a study using telemetry
… availability of commercially important pelagic prey species. The more recent diet time series for Ichaboe Island (Nov 1995 to Feb 2004) showed that trawler scavenged hakes Merluccius spp and naturally foraged saury Scomberesox saw'us dominated the diet by both contribution to mass (35 and 34 %, …
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Feeding habits of the yellowtail flounder and production of its invertebrate prey on Georges Bank
… history and production of three benthic amphipod species: Ampelisca agassizi, Unciola inermis and Ericthonius fasciatus. Abundant over large areas of Georges Bank, these amphipods are important prey of yellowtail flounder. From benthic grab samples collected quarterly during 1981 to 1983, over 200 …
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Feeding ecology of franciscana dolphin, Pontoporia blainvillei (Cetacea:Pontoporiidae), and oceanographic processes on the Southern Brazilian coast
… and shrimps, and adults consumed larger fish prey and more cephalopods. Adult females had similar diet to juveniles, possibly related to parental guidance. Feeding regimes from northern and southern areas also revealed significant differences, where the most important fish prey from the …
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Effects of the aquatic to terrestrial habitat ratio on an amphibian predator and its prey
… terrestrial ratios and found that larvae of this species were more dense in landscapes where aquatic habitat was scarce relative to terrestrial habitat. Because larval <italic>A. maculatum</italic> are top predators, they had more dramatic effects on the community composition of their prey in …
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