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 58 for “"Prey abundance"”.
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Street-wise : does prey abundance buffer black sparrowhawks (Accipiter melanoleucus) from the negative health impacts of urbanisation?
… urban impacts on patterns of diversity and abundance of species have been well-studied, there remains a distinct lack of understanding around the impacts on ecological interactions. Different species have different levels of tolerance to urban disturbance, some species even appear to thrive …
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Effects of drifting prey abundance on food consumption and growth of brook trout in Shenandoah National Park
The relation between prey density and brook trout Salvelinus fontinalis food consumption has not been quantified in natural streams. This relation may be most critical in the summer when southern Appalachian trout have demonstrated poor growth. It is not Known whether the poor growth is due to the …
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Examining the role of management, forest structure, and prey abundance in driving Eastern Whip-poor-will habitat use in Southern Illinois and the Missouri Ozarks
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Factors influencing the foraging behaviour of African Penguins (Spheniscus demersus) provisioning chicks at Robben Island, South Africa
… behaviour in relation to estimated local prey abundance and other factors without the confounding variable of local fishing. Penguins provisioning chicks were equipped with GPS temperature depth devices for a foraging trip. Dive data (N = 75) and GPS tracks (N = 78) were collected from 78 …
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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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The foraging ecology, demographics and conservation of African black oystercatchers Haematopus moquini in Namibia nursery areas
… of habitat use and responses to changes in prey abundance, and to investigate whether nurseries provide favourable foraging conditions and high energetic returns for juvenile oystercatchers.
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Carnivore ecology and conservation : implications for tiger conservation and management in Nepal /
… developed a novel model to estimate prey abundance, assessed intraguild interaction between tigers and leopards in response to prey and disturbance factors, and evaluated sustainable financing mechanisms for tiger conservation programs. The success of carnivore conservation relies on …
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Patterns in Gray Wolf Pup Survival and Recruitment in Northern Minnesota
… of decline coincided with periods of reduced prey availability and increased energetic demands of dependent wolf pups. This indicates that starvation due to reduced prey availability is likely a primary cause of mortality among wolf pups and the driving force behind intra-annual patterns of …
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Stomach Content Analysis of the Invasive Small Indian Mongoose (Herpestes auropunctatus) from Puerto Rico
… generalist predators that readily switch prey consumption depending on prey availability. There are seven ecological zones in Puerto Rico that vary in rainfall, elevation, and vegetations thus creating heterogeneous environments that likely differ in prey abundance, which presumably …
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Influence of Food Web Structure and Environmental Conditions on Walleye Stocking Success in Two South Dakota Impoundments
… populations. Despite annual stockings, Walleye abundance in Mina Lake, South Dakota has remained low. Previous research at Mina Lake has shown increased trophic state, large proportions of benthic invertebrates consumed by stocked Walleye, and increased abundance of Freshwater Drum Aplodinotus …
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Factors Limiting Overwinter Survival of Young-Of-The-Year Largemouth Bass in South Dakota
… to examine the effects of total length (TL), prey abundance, and water temperature on approximate body composition, condition index, and overwinter survival of young-of-the-year (YOY) largemouth bass Micropterus salmoides in South Dakota. Growth and condition of YOY largemouth bass stocks from …
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Ecological Factors Associated With Songbird and Small Mammal Predation by Texas Ratsnakes
Predator-prey relationships have received extensive theoretical and empirical attention although the majority of studies have focused exclusively on prey. In studies of avian ecology, predation is the primary cause of nest failure and yet few studies examine predators directly. For my dissertation, …
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Functional diversity enhances detection of ecosystem stability and resolution of predator-prey interactions within a multitrophic community
… beetle predators. I also considered predator-prey interactions between beetles and their insectivore avian predators at the community level.</p> <p>To meet my objectives, I developed new functional traits to further capture beetle species’ functional roles and new methodology for examining …
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Prey Selection by Young Lemon Sharks (Negaprion brevirostris) at Chandeleur Island Nursery Habitats with a Comparison to Three Other Co-Occurring Shark Species
… habitats for lemon sharks that provide abundant prey and protection from predation. Other local shark species (Atlantic sharpnose, bull, and blacktip sharks) co-occur with lemon sharks in the same region, including the nearby Biloxi Marshes. To better assess how lemon sharks use these nursery …
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A Biogeographic Analysis of the Socially Polyphenic Spider <em>Anelosimus studiosus</em> in East Tennessee.
… area. Survival is affected by: predator/prey abundance, temperature, relative humidity. A group of organisms that are particularly prone to habitat sensitivity are web-building spiders, because building the web commits them to a particular site for a period of time. <em>Anelosimus …
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Lizdavietėse-gaudyklėse apsigyvenančių klosčiavapsvių (Hymenoptera: Vespidae: Eumeninae) vystymasis ir rūpinimosi palikuonimis elgsena /
… impact of nesting cavity parameters and prey abundance on the nesting behaviour of solitary xylicolous wasps. We studied nest structure and the influence of nesting cavity width and length on progeny size and sex ratio in 13 wasp species. The development of the most common synanthropic …
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INTERANNUAL VARIABILITY IN MORPHOMETRIC CONDITION OF LARVAL FISH AS A FUNCTION OF ENVIRONMENTAL VARIABLES IN BEAUFORT, NC
… experienced by fish larvae. Variations in larval abundance and condition have not been consistently related to juvenile abundance and recruitment for many fisheries species. By studying how environmental factors affect larval fish condition, we may be able to better anticipate when a high or low …
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Piping plover breeding biology, foraging ecology and behavior on Assateague Island National Seashore, Maryland
… on the ocean beach. Indices of invertebrate prey abundance indicated that insects were more abundant on the bay beach and island interior than on the ocean beach. Disturbance did not differ among brood-rearing habitats. Human disturbance was higher in 1990 than in previous years. Overall …
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Management and Mother Nature: piping plover demography and condition in response to flooding on the Missouri River
… of chicks. We also collected 3,347 invertebrate prey samples. We used a random effects logistic exposure model to estimate nest success, a random effects Cormack-Jolly-Seber model in RMARK to estimate pre-fledge chick survival and the Barker model in RMARK to estimate hatch-year (HY) and after …
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