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 55 for “"habitat heterogeneity"”.
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Influences of watershed urban development on habitat heterogeneity and native fish diversity in a ridge and valley stream in Southeastern Tennessee
… Tennessee area. Stream water quality, habitat, and fish assemblages were sampled in May-June 2005 at seven sites (drainage areas <17 km2) in the Mountain Creek system (Tennessee River drainage). Watershed urban land use (predominantly residential) ranged from 1.62 % to 18.97 % and …
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The effects of habitat change on bird diversity and community structure in a mesic Savanna landscape
… disturbance, succession, vegetation change and habitat heterogeneity is crucial to managers because together they can influence biodiversity. For example, a break in the disturbance regime could promote woody plant encroachment. Though this might lead to an increase in habitat heterogeneity, the …
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A Test of the Area of Refuge Hypothesis in Indo-Pacific Marine Biogeography
… One of these hypotheses suggests that available habitat area is the main predictor of species richness. This is the basis for the area of refuge hypothesis that attempts to explain the global maxima of species richness found in the Coral Triangle, the area encompassing mostly the Philippines, …
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Species richness and composition of avifaunal communities in a complex Amazonian landscape
… has been undertaken to identify the effect that habitat heterogeneity and seasonality have on the diversity of birds in lowland Amazonia. This study aimed to identify how species richness and composition of avifaunal communities in the lower Rio Purús region of central Amazonia compare across …
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Ecological separation of the black and blue wildebeest on Ezemvelo Nature Reserve in the highveld grasslands of South Africa
… was investigated in an area with suboptimal habitat for both types of wildebeest. Habitat selection and separation of the black and blue wildebeest population were investigated at three main scales. A combination of logistic regression analysis, discriminant analysis and hypothesis testing …
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Connectivity, metapopulation dynamics, and genetic structure of tiger salamanders in a heterogeneous landscape
… integral for understanding the impact of spatial habitat structure on ecological and evolutionary processes. In fragmented landscapes, theory predicts that species occupancy and turnover dynamics depend on habitat area and isolation, and isolation has historically been an important predictor of …
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Lion population status and ecology in a seasonally-flooded wetland, the Okavango Delta
… home range was also negatively correlated with habitat heterogeneity and island size and connectivity. Male home range sizes, however, were not affected by prey availability, but instead were negatively correlated with habitat heterogeneity and proportion of woodland, both of which are …
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The edge effect: lateral habitat ecology of an alluvial river flood plain
… describe the ecology of off-channel or "lateral" habitats as key attributes of the Shifting Habitat Mosaic (SHM) of a river flood plain at the Nyack Research Natural Area in northwestern Montana. Our working hypothesis was that lateral habitats are important to the cycling of energy and materials …
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The edge effect: lateral habitat ecology of an alluvial river flood plain
… describe the ecology of off-channel or "lateral" habitats as key attributes of the Shifting Habitat Mosaic (SHM) of a river flood plain at the Nyack Research Natural Area in northwestern Montana. Our working hypothesis was that lateral habitats are important to the cycling of energy and materials …
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Life history, diversity and patterns of bat community structure in the Spring Mountains of southern Nevada
… which bats were active generally reflected their habitat use. Maximum and minimum temperatures, and weather were the abiotic factors best predicting bat activity; Relationships between local (alpha) bat diversity and local environmental variables were also investigated. Species diversity varied …
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Zooplankton population variability in a warming ocean: Modeling spatiotemporal patterns and drivers within a dynamic shelf ecosystem
… variable and predominantly driven by local habitat heterogeneity rather than region-wide environmental conditions. Notably, populations connected via advection and experiencing synchronous temperature conditions are not necessarily synchronized, illustrating the influence of internal …
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Ecology and climates of early Middle Pleistocene interglacials in Britain
… their likely importance for vegetation and habitat structure. Chapters 4, 5 and 6 present in-depth multi-proxy palaeoenvironmental studies from three early Middle Pleistocene sites: West Runton, Pakefield and Brooksby. A combination of Coleoptera, pollen, coprophilous fungal spores, …
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Population genetics of species on the genera Tursiops and Delphinus within the Gulf of California and along the western coast of Baja California.
… common dolphins supports the hypothesis of local habitat dependence and resource specialization at both the population and putative species level. Fine-geographic scale structure was detected in coastal bottlenose dolphins, which seemed to be strongly associated to the biogeographic subdivision of …
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The Role That Asexual Reproduction Plays in the Regeneration of Tropical Piper Shrubs: Habitat Differences and Genetic Consequences
… plants with a variety of life-histories and habitat requirements. My dissertation research examined the ecological correlates and population genetic consequences of asexual reproductive success in five co-occurring Piper species using a combination of field experiments and molecular …
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Biodiversity, distribution patterns and trophic position of meiobenthos associated with reduced environments at continental margins
… can function as an interesting tool to describe habitat heterogeneity in the marine environment. In this thesis, nematodes are used as key group to explore the meiobenthic communities inhabiting different cold seeps associated with pockmarks or mud volcanoes, and located in the North and South …
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Evaluation of the Relationship Between Land Use and Water Quality in Kittitas County, WA
… targeted to reduce nutrient inputs and increase habitat heterogeneity for the restoration of sensitive macroinvertebrates. Overall, this study highlights how land use is associated with degraded stream habitat showing the biological consequences observed in the aquatic macroinvertebrate community …
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Wildland fuel loading estimates along a gradient of forest cover types and landscape factors in Harpers Ferry National Historic Park, West Virginia and Rock Creek Park, Virginia, USA
… cycling, and provides an important source of habitat heterogeneity for multiple insect, reptile, amphibian, and small mammalian species. Within the National Park Service, many managers of parks with high visitation rates have been asked if forests within their parks are in decline, or are at …
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The Role of Urban Climate and Land Cover in Phenology, Nest Success, and Habitat Use
… systems. Climatic variability and spatial habitat heterogeneity within a city could influence species in habitat remnants. The objectives of this project were to investigate the relative importance of temperature variation and urban land cover for nest survival, the function of thermal …
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Addressing Insect Declines Via Biodiversity Monitoring, Ecological Restoration, and Population Genetics
… and defining the population genetics of a habitat-specialist beetle. First, I present a novel biodiversity monitoring approach, the Rapid, Recurring, Structured Survey (RRSS). The RRSS can be flexibly applied to meet diverse objectives and can generate data for different taxonomic groups …
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