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 118 for “"predation risk"”.
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HUMAN PREDATION RISK AND ELK BEHAVIOR IN HETEROGENEOUS LANDSCAPES
… were to reduce population growth rate, crop depredation, and habituation to humans. However, little was known about the indirect effect hunting has on anti-predator behavior, movement, resource selection, and human-elk conflicts. We first investigated the indirect effects of hunting on elk …
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HUMAN PREDATION RISK AND ELK BEHAVIOR IN HETEROGENEOUS LANDSCAPES
… were to reduce population growth rate, crop depredation, and habituation to humans. However, little was known about the indirect effect hunting has on anti-predator behavior, movement, resource selection, and human-elk conflicts. We first investigated the indirect effects of hunting on elk …
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Resource selection, predation risk, and population dynamics of woodland caribou
… patterns of resource selection by caribou, wolf predation risk, adult female caribou survival and, ultimately, population trend for 9 woodland caribou populations. Caribou avoided disturbance across all scales of resource selection, though avoidance of forestry cut-blocks was strongest at broad …
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Resource selection, predation risk, and population dynamics of woodland caribou
… patterns of resource selection by caribou, wolf predation risk, adult female caribou survival and, ultimately, population trend for 9 woodland caribou populations. Caribou avoided disturbance across all scales of resource selection, though avoidance of forestry cut-blocks was strongest at broad …
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Predation Risk and Colony Structure in the Pea Aphid, Acyrthosiphon Pisum
… or permanent aggregations to reduce individual predation risk. Hamilton's "Selfish Herd" theory states that an individual should assume a central position within a group to decrease individual predation risk relative to that of its neighbors (i.e., individuals should be selfish). This theory, …
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Group size affects predation risk and foraging success in Pacific salmon at sea
… individuals is challenging, and quantifying predation risk or foraging success is often impossible. To overcome these difficulties, I analyzed a multi-decadal data set from sampling of Pacific salmon (Oncorhynchus spp.) in the ocean. Across all species, individuals in larger groups had lower …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… increases in time dependent mortality, like nest predation risk in birds, should favor growth of body features that enhance the ability to leave nests earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would …
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Differential growth of body components among coexisting passerines in response to nest predation risk
… increases in time dependent mortality, like nest predation risk in birds, should favor growth of body features that enhance the ability to leave nests earlier. We studied 12 coexisting species of passerines to specifically test predictions that species with higher nest predation rates would …
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Perceived Predation Risk And The Responses Of Adult And Nestling Tree Swallows (tachycineta Bicolor)
<p>Some species of birds have alarm calls that are functionally referential and provide their nestlings with information about the level of threat predators may pose. Although several investigators have examined the responses of nestlings of species with open-cup nests to the anti-predator calls of …
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Using spatial methods to analyse anthropogenic predation risk and movement ecology of white-tailed deer (Odocoileus virginianus)
… behaviour of White-tailed deer in response to predation pressure from human hunters in combination with the biotic and abiotic drivers of predation risk and flight response. Giving wildlife managers greater understanding to influence deer populations, and landscapes, in the future.
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The Effect of Seasonal Vegetation Changes on Habitat Suitability and Predation Risk of the Vancouver Island Marmot
… detect predators, thereby increasing their risk of predation. Most marmot mortalities occur during the late summer, which may be related to peak vegetation growth during that period. This study assessed how these seasonal changes to vegetation in Vancouver Island marmot habitat is affecting …
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The Influence Of Predation Risk On The Foraging And Territorial Behavior Of The Ozark Zigzag Salamander (Plethodon Angusticalvius)
When risk of predation is high, animals often decrease the frequency of behaviors associated with feeding, territorial defense, and reproduction. I examined the potential for such trade-offs in the Ozark zigzag salamander, Plethodon angusticlavius. I performed a series of laboratory experiments to …
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Biogeographic Patterns, Predator Identity, and Chemical Signals Influence the Occurrence and Magnitude of Non-lethal Predator Effects
… to occur, prey must detect and respond to predation risk. While the importance of information transfer in this process has been realized, few studies explore how prey responses are influenced by predator characteristics and environmental conditions that influence the transmission of cues …
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Behavioral and Metabolic Responses of Juvenile Spotted Salamanders (Ambystoma Maculatum) to Alarm Cues from Damaged Skin and Predator Diet
… individuals that are able to assess the level of predation risk and perform appropriate antipredator behaviors when predation risk is high. I investigated the ability of lab-reared juvenile spotted salamanders, Ambystoma maculatum, to assess predation risk via chemical alarm cues and substrate …
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Avian nest predation: relationships with landscape characteristics and influences on adult and nestling behavior.
Nest predation is the leading cause of reproductive failure in birds. As a result, many studies have sought to understand what factors influence nest predation as well as the ways in which birds respond to predation. However, identifying the factors that lead to variation in nest predation has …
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Habitat, landscape, and climate effects on riparian predator-prey interactions in a human-dominated ecosystem
… the spatial distribution of a main prey, and (2) predation risk for an aquatic prey from a variety of aquatic and riparian predators. I examined the seasonal diet of American mink and determined if a primary prey, crayfish, was an important driver of habitat selection during the summer of a severe …
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Factors influencing the nursery dynamics of juvenile bull sharks in two estuaries along the Texas coast
… (YOY) age class. This study investigated how predation risk and abiotic factors influenced the occurrence and densities of YOY bull sharks in two Texas estuaries: San Antonio Bay and Sabine Lake using in-situ drumline sampling and historical long-term gillnet monitoring (1985-2018). In San …
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