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 “"species persistence"”.
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Predicting biodiversity loss in insular neotropical forest habitat patches
… Amazonia. Patch area was a key driver of species persistence for all study taxa, yet other factors were also important. Hunting pressure exerted a strong influence on patterns of primate persistence within 760 fragments, and edge effects, including edge-related ground-fires, were the main …
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Biodiversity of urban brownfields: modelling species occurrence and persistence in dynamic habitats
… for a diverse flora and fauna, including rare species. The continuous changes in brownfield location (due to redevelopment and abandonment) and in their habitat conditions (due to succession) generate a spatio-temporal mosaic cycle of transient habitats. Aim of this study was to evaluate the …
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The spatial modelling of high-latitude plant richness and refugia in a changing environment
… is needed of how these changes cascade into species distributions and what they might mean for the Arctic-alpine realm. These high-latitudes are expected to be susceptible to change. This vulnerability highlights the importance of identifying drivers of Arctic-alpine species and the landscape …
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The Role of Intraspecific Variation, Species Interactions, and Eco-evolutionary Feedbacks in Population Persistence
… been investigated with respect to population and species persistence, especially in small populations. However, the role of some evolutionary processes, such as balancing selection mechanisms, in the persistence of small populations remains unclear. Furthermore, recent studies have shown that …
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Genetic Structure and Demographic Analysis of Key deer (Odocoileus virginianus clavium)
… Key deer are a federally endangered subspecies assumed to be genetically unique (based on one allozyme study), homogeneous, and have a female-biased population of approximately 900 deer. I used 985bp of the mitochondrial cytochrome b gene and 12 microsatellite loci to test two …
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Utilizing Ecological Connectivity in California Desert Wilderness Preservation
… successful in maintaining ecosystem function, species persistence, and biological and genetic diversity. Prioritization of ecological connectivity by federal land management agencies would contribute to a more resilient National Wilderness Preservation System and the protection of the unique …
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Plant-Soil Feedback and Perennial Forage Systems
… practices interact to influence native species persistence is critical for sustainable perennial forage systems. I combined a multi-year field trial with a controlled greenhouse PSF experiment to evaluate how harvest frequency and community composition influence native species …
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Impacts of ocean acidification on fitness and chemical communication in a model marine invertebrate, Nereis succinea
… impacts associated with OA are variable between species. The presented research shows long-term culture (4-6months) in near future OA conditions (CO₂ enriched to pH 7.8) delays metamorphosis in the marine polychaete, Nereis succinea. Culture in pH 7.8 seawater also caused interference with the …
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Avian population and community dynamics in response to vegetation restoration on reclaimed mine lands in southwest Virginia
… early successional habitat needed by many avian species currently in decline throughout eastern North America. I evaluated nest-site selection and nest success for on reclaimed mine lands in southwest Virginia during the summers of 2010 and 2011. For this nest-site analysis, I focused on 2 bird …
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The population dynamics and conservation of the African Black Oystercatcher, Haematopus moquini
… considered to be of conservation concern to the species are (a) its inherently low and variable breeding success; (b) its ground-nesting habit, making it vulnerable to numerous direct and indirect impacts of human disturbance; (c) its susceptibility to mass mortalities, particularly of adult …
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Species Distribution and Richness Patterns of Bird Communities in the High Elevation Forests of Virginia
… islands that harbor many isolated populations of species at the southern limits of their range. Understanding the governing forces of population dynamics in this region will enhance the probability of species persistence in the face of threats such as global warming and human development. We …
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Behavioural ecology of the greater bilby (Macrotis lagotis) and conservation tool development in a semi-wild sanctuary
… necessary tool to stem the decline of threatened species globally. The greater bilby (Macrotis lagotis) is a nationally threatened species in Australia. While bilby translocations are expected to contribute to the species’ persistence, the scarcity of information on their behaviour and ecology …
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Ecology and Genetics of Blanding's Turtles in an Urban Landscape
… are expected to become major threats to the species' persistence. Most knowledge to date has been generated in areas where habitats are relatively undisturbed by urban development. Consequently, the potential effects of urbanization on Blanding's turtles are not well established. To develop a …
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Incorporating costs and processes into systematic conservation planning in a biodiversity hotspot
… targets efficiently, usually focusing on species’ representation. Only rarely is the long-term persistence of species taken into account and the costs of conservation are usually ignored. I use the Eastern Arc Mountains of Tanzania as a study area to develop novel methods for creating and …
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Interactions, Heterogeneity, and the Determinants of Multispecies Coexistence
… But in a finite world with over 8.7 million species, acquiring such resources is an inherently competitive endeavour. This has resulted in an extraordinary diversity of interactions, with varying strengths that have either negative or positive consequences for species’ performance. Over the …
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Population Size And Habitat Association Of Etheostoma Nebra, The Buck Darter, Using Abundance Modeling In The Buck Creek System, Cumberland River Drainage, Kentucky
… nebra (Buck Darter) is a recently described fish species confined to the Buck Creek system, Cumberland River drainage, Kentucky. A 2010-2012 survey of Buck Creek by Kentucky Department of Fish and Wildlife Resources personnel observed E. nebra at 2 of 47 historical sites. Within the entire system, …
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Analysis of the ecological principles underpinning forest landscape restoration: a case study of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK).
… such strategies are largely untested for species associated with woodland habitat. For many woodland invertebrate species, local scale processes are potentially more important than processes operating at the landscape scale in terms of species persistence, especially for those species that …
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Nestbox use and predicted distribution of the southern greater glider (Petauroides volans) following the Black Summer megafires.
Species losses and declines continue to occur across the globe and are predicted to increase exponentially due to anthropogenic climate change. South-eastern Australia has been identified as a future extinction hotspot for terrestrial mammal fauna. The southern greater glider (Petauroides volans), …
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Nestbox use and predicted distribution of the southern greater glider (Petauroides volans) following the Black Summer megafires.
Species losses and declines continue to occur across the globe and are predicted to increase exponentially due to anthropogenic climate change. South-eastern Australia has been identified as a future extinction hotspot for terrestrial mammal fauna. The southern greater glider (Petauroides volans), …
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Chacma baboon movement and behaviour in commercial timber plantations in South Africa and their association with bark-stripping
… thus, may serve as a refuge for many wildlife species. In this thesis, I explore how native wildlife has responded to the widespread establishment of commercial tree plantations in the escarpment region of Mpumalanga Province, South Africa, and test the hypothesis that plantations are ‘green …
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