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 23 for “"Apex Predator"”.
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Ecosystem Functional Consequences Of Body Size Variation In An Apex Predator (Ambystoma jeffersonianum)
… (a functional trait in many aquatic taxa) in an apex predator on ecosystem functioning. We sought to characterize trophic cascades initiated by larval populations of Ambystoma jeffersonianum that varied in size structure based on diversity of maternal lines (i.e., sibship diversity) by …
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Behavioural causes and consequences of sexual size dimorphism in an apex predator species.
Individual differences within populations in a range of phenotypic traits are hypothesised to have important ecological and evolutionary implications. Variation in individual growth rates that result in corresponding variations in body sizes, including size dimorphism, is a particularly widespread …
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Space Use and Survival of White-Tailed Deer in a Disturbance-Driven System Containing a Restored Apex Predator
… panther (Puma concolor coryi), their primary predator in this system, call for a renewed look at how these forces affect this deer herd. To assess the effects of these forces on seasonal space use, behavior, and survival of deer, I analyzed GPS telemetry and camera trap data, highlighting the …
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Landscape dynamics from 1990--2010 and the human to apex predator (red-tailed hawk) relationship on La Gonave, Haiti
… out of sight. The RTH currently has no known predators, but it remains in danger of island extirpation due to ecological degradation.
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Behavioural ecology of white sharks carcharodon carcharias in False Bay, South Africa: towards improved management and conservation of a threatened apex predator
… sunrise, where the probability of encountering predator-naïve seals was highest. Shark presence at Seal Island mirrored the spatial distribution of predation around the Island, which was highest on the South side within 400 m of the Island, and at sunrise. In spring and summer, there was marked …
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Effective monitoring techniques for carnivores and the role of a dominant mesocarnivore in structuring the carnivore community
… must be rigorously tested before use. Similarly, apex predators play a major keystone role in structuring ecosystems but are highly threatened and it is unknown if a dominant mesocarnivore can fill the same role in their absence. I tested the efficacy and decay of two scent lures (sardines and …
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Determinants of predator abundance in northern KwaZulu-Natal: top-down or bottom-up?
… ultimately aim to successfully conserve natural predator populations, an understanding of the non-anthropogenic drivers of their population change is critical. Both bottom-up (e.g. food limitation, competition) and top-down (e.g. predation, interference) processes play an important role in …
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Gazing at Other Animals: A Deconstruction of the Anthropocentric Gaze in the Representation of Apex Predators
… research deconstructs representations of large apex predator animals within film and wildlife documentaries, examining the influence of mainstream narratives on public perceptions of wildlife behaviour. Through the cultural studies field of Critical Animal Media Studies (CAMS), the research …
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Somatic condition, growth and distribution of Atlantic bluefin tuna (Thunnus thynnus) in the Gulf of Maine
… tuna (Thunnus thynnus), a highly migratory apex predator, utilize temperate feeding grounds to place their tissues into positive lipid balance following reproduction and subsequent migration to northern latitudes. Commercial fishermen target Atlantic bluefin tuna between June and October, …
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TROPHIC DYNAMICS OF THE LAKE SUPERIOR FISH COMMUNITY
… including the rehabilitation of the native apex predator lake charr (<em>Salvelinus namaycush</em>) and the introduction of several nonnative species. The trophic linkages and ecological requirements of the entire fish community, including predators and prey fishes, has not been assessed on …
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Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean
… pelagic ocean by influencing the movements of an apex predator and governing the connectivity between deep scattering layer communities and deep-diving, epipelagic predators. Together, these studies demonstrate the breadth and depth of information that can be garnered through the integration of …
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The Response of a Predatory Fish, Ophiodon elongatus, to a Marine Protected Area: Variation in Diet, Catch Rates, and Size Composition
… fishing in some California MPAs. Lingcod is an apex predator that consumes a variety of fish and invertebrate species. In this study, I sought to assess the effect of an MPA on the abundance, size and diet of Lingcod. I hypothesized that Lingcod in a no-take MPA would be more abundant and larger …
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Non-lethal methods for assessing the health and status of fish species of conservation concern.
… Alligator Gar Atractosteus spatula, a long-lived apex predator threatened by habitat loss and harvest oriented fishing, and the Longnose Gar Lepisosteus osseus a commonly occurring ubiquitous relative of Alligator Gar. This dissertation examines commonly used endpoints in ecology and ecotoxicology …
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Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean
… pelagic ocean by influencing the movements of an apex predator and governing the connectivity between deep scattering layer communities and deep-diving, epipelagic predators. Together, these studies demonstrate the breadth and depth of information that can be garnered through the integration of …
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Ecosystem Functional Consequences of Top Predator Mortality Due to the Invasive Shrub, Lonicera maackii
… would increase mortality of a top amphibian predator due to the release of phenolic compounds that inhibit respiration. A mesocosm experiment was developed to characterize the cascading effects of increased top predator (Ambystoma maculatum) mortality on larval salamander growth, …
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The trophic dynamics of the broadnose sevengill shark (Notorynchus cepedianus) in False Bay, South Africa, using multiple tissue stable isotope analysis
… information on the trophic ecology of large, apex predator sharks. This is largely a consequence of their occupying naturally low population densities, being highly mobile and elusive and ranging over large distances. Stable isotopes provide a low cost, non-lethal method for investigating the …
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Habitat and population structure of the Morelet’s crocodile (Crocodylus moreletii) in Calakmul Biosphere Reserve, Campeche, Mexico
… Morelet’s crocodile (Crocodylus moreletii) is an apex predator and a flagship species inhabiting these aquatic environments, but only rudimentary information about this species exists in the region.This PhD project contributes to current knowledge on aquatic habitat in Calakmul Biosphere Reserve …
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Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management
Seabirds are an apex predator in marine ecosystems and can be important bio-indicators for informing wider marine conservation and management. They face many threats from anthropogenic activities at sea but the interactions and subsequent impacts can often be difficult to monitor, particularly in …
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The spatial ecology and behaviour of the broadnose sevengill shark (Notorynchus cepedianus) in South Africa
Top predators are an important component of healthy ecosystems, contributing to ecosystem stability and biodiversity through direct and indirect effects. However, significant knowledge gaps exist in our understanding of the occurrence, biology and spatiotemporal dynamics of marine predators, …
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Population Demographics of Cougars in the Black Hills: Survival, Dispersal, Morphometry, Genetic Structure, and Associated Interactions with Density Dependence
The cougar (Puma concolor) is the remnant apex predator of South Dakota. Cougars were extirpated from the majority of the Dakotas by the early 1900s, and severely reduced or extirpated from the Black Hills of South Dakota and Wyoming during this same time. Many factors led to the demise of cougars …
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