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 154 for “"population declines"”.
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Modelling mitigation of bird population declines in the UK through landscape-scale environmental management.
… of habitat and landscape changes on bird populations in two contrasting and mixed land-use sites: heathland and woodland in the New Forest (Hampshire) and arable farmland with scattered woodlands in Cambridgeshire. Recently acquired, high resolution airborne remote sensing datasets (Light …
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The Role of Breeding Habitat Loss in the Decline of Eastern Whip-Poor-Will (Antrostomus Vociferus) Populations in Canada
Populations of birds that feed on flying insects (i.e., aerial insectivores) have been declining for several decades in North America, yet the cause of these declines is poorly understood. Among aerial insectivores, Eastern Whip-poor-will (Antrostomus vociferus; “Whip-poor-will”) populations have …
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Aspects of municipalities associated with occupancy of Chimney Swifts and Common Nighthawks in Illinois
… Nighthawk (Chordeiles minor) are experiencing population declines across North America. While causes of declines are unknown, habitat availability is likely a contributing factor. Both species breed in urban areas. Chimney Swifts historically nested in tree cavities but now primarily nest in …
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Host-Pathogen Ecology: Effects of Species Ecology and Environmental Factors on the Intensity and Distribution of Disease Among Illinois Amphibians
… et al. 2011). One of those threats has caused population declines globally (Stuart et al. 2004), <italic>Batrachochytrium dendrobatidis</italic> (<italic>Bd</italic>), which is the fungal pathogen that causes chytridiomycosis in amphibians (Berger et al. 1998; Longcore et al. 1999). …
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Spring Dispersal and Breeding Ecology of Northern Bobwhite in Southwest Ohio
… Despite nearly a century of research, population declines continue at state and national scales. Precipitous population declines and range-contractions in the Midwest have been caused by land-use changes and suppression of natural disturbance regimes. Reproduction that meets or exceeds …
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Grassland and Woodland Bird Occurrence and Habitat Selection in the Prairie-Forest Transition Zone of Minnesota
… and grassland nesting birds have experienced population declines in the midwestern United States. Habitat loss and habitat fragmentation are suspected to be two of the underlying causes for the population declines of woodland and grassland birds. The Minnesota Valley Wetland Management …
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Measuring the exposure of Songbird Nestlings to Neonicotinoids in Natural and Agricultural Nest Sites
… suggests that grassland birds are experiencing population declines concurrently with increased IMI use. Field research was conducted to test the presence of IMI in Savannah Sparrow (SAVS) nestlings and their insect food supply at agricultural and non-agricultural nests. Using urine samples from …
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Population demography of lark buntings: post-fledging survival, fecundity, and breeding decisions
… bird species have experienced the largest population declines of any terrestrial avian group in the past four decades in North America. Lark buntings (Calamospiza melanocorys), endemic to the grasslands of North America, have declined by 2.5% per year in Colorado and 2.1% per year in the …
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The Role of Scientific Uncertainty in Polar Bear Conservation Policy: A Descriptive Analysis
… For decades, policies successfully mitigated population declines as a result of such stressors, but new and emerging threats have again put the species in peril. The impacts of climate change have motivated the five polar bear range states to revisit protective policies and yet no measures …
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An Invasive Species as a Threat to Native Biodiversity: Larval Competition Between Native Anurans and an Invasive Treefrog
… activity level within treatments. To avoid local population declines of native anurans, management of Cuban Treefrogs should focus on preventing establishment of new populations.</p>
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Phylogeography and Conservation of the Arroyo Toad (Bufo californicus)
… Baja California, Mexico. It has experienced population declines throughout its range, as a result of urbanization, hydrologic alterations, and overall habitat loss. As part of the Recovery Plan for this species, it was determined that more research was needed to assist in management …
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The effects of introduced mice on seabirds breeding at sub-Antarctic Islands
… are known or suspected to be experiencing population declines with 97 (28%) of the 346 species currently classed as globally threatened and at risk of extinction. Introduced predators at oceanic islands where many seabirds breed account for the largest proportion of population declines, …
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Lipid Biosynthesis and Maturation Signals in Batrachochytrium Dendrobatidis In Vitro
… and partly attributed to massive global population declines of frogs and salamanders. Many of the molecular mechanisms behind the growth and development of Bd and how the fungus invades and infects amphibian hosts are unknown. In this study, two aspects of Bd development were analyzed. …
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DETECTION AND OCCURRENCE OF NERODIA HARTERI (SERPENTES: COLUBRIDAE) IN AN UPPER PORTION OF THE BRAZOS RIVER WATERSHED
… be necessary to minimize the risk of continued population declines.</p>
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Reintroduction Biology of Head-Started Ornate Box Turtles
… a prairie-dwelling species that has experienced population declines, especially near the northern edge of its range. In order to provide supporting research for a reintroduction program at the Upper Mississippi River National Wildlife and Fish Refuge in northwestern Illinois, I compared the …
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Born To Be Wild: Tiger Persecution and Advocacy From 1800 to the Present
… now hovers dangerously close to extinction. Population declines within the last two centuries are blamed largely on loss of habitat, reductions in prey species, poaching, and human-tiger conflict. Modern tiger conservation efforts focus on reintroducing formerly captive tigers to designated …
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Prevalence of Batrachochytrium Dendrobatidis in an Amphibian Communities of Central Texas and Tamaulipas, Mexico
… as a potential causative agent in the amphibian population declines of the past 50 years. This study seeks to assess the prevalence of Bd in amphibian communities in Central Texas and the state of Tamaulipas, Mexico. In Central Texas two counties were evaluated during the spring of 2012, and for …
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Bull trout (Salvelinus confluentus) population structure and extent of hybridization with brook trout (S. fontinalis) across Alberta's Eastern Slopes
… charr native to northwestern North America, face population declines and require protection to ensure their persistence and survival. In my thesis, I used genetic loci known as Single Nucleotide Polymorphisms (SNPs) to investigate the genetic status of bull trout across Alberta. My two main …
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Assessing threats to North American bats: impacts of white-nose syndrome and climate on reproduction and survival
… disease that has been causing catastrophic declines of bat populations in the eastern United States and Canada since it first emerged in 2006. The fungal pathogen, Pseudogymnoascus destructans, infects the wings, ears and nose of bats that hibernate in caves in winter while both cave …
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Determining the role of density-dependent effects in disease induced population impacts
… manner. Here we examine the processes by which population density contributes to the observed declines of bats infected with white-nose syndrome, a fungal disease that has decimated bat populations across North America. We evaluated the contribution of both density-dependent transmission rates …
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