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 “"Species Abundance"”.
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Mosquito Species Abundance, Diversity and Arbovirus Prevalence across Different Land-use in The Gambia
… The Gambia. This study investigates mosquito species abundance and diversity, as well as the arbovirus prevalence across human, agricultural, and sylvatic habitats in The Gambia, accounting for ecological and seasonal variation. Adult mosquito samples were collected using a BG-Pro and CDC …
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Regional data refine local abundance models: modeling plant species abundance distributions on the Central Plains
Species distribution models are frequently used to predict species occurrences in novel conditions, yet few studies have examined the effects of extrapolating locally collected data to regional scale landscapes. Using boosted regression trees, I examined the issues of spatial scale and errors …
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Pattern and process at a desert grassland-shrubland ecotone
… grassland-shrubland ecotone. First, small-scale species coexistence patterns in microsites around dominant grasses (B. eriopoda) and shrubs (L. tridentata) were compared. Second, small-scale patterns were related to landscape scale species richness. Third, a gap-dynamics simulation model …
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Examination of small mammal diversity in the riparian areas of Walden, Tennessee
… 1998). Therefore small mammal diversity and abundance should be greater in riparian areas when compared to contiguous upland hardwood forests. The intent of this study is to compare small mammal communities living within the two habitat types. Abundance trends were observed for two species: …
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Effects of Habitat on Population Density of Centrarchid Species in the James River, Missouri
… if there was an effect of habitat on centrarchid species population density. Seven sites on the James River, Missouri were sampled two times each using a backpack electroshocker. Centrarchids were identified and measured. Habitat was measured. Macroinvertebrates were collected. Catch per unit …
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Effects of Landscape Age and Salinity on Plant Community Composition and Productivity in Opportunistic and Constructed Wetlands in the Athabasca Oil Sands Region, Alberta
… thus support diverse flora (approximately 400 species in Alberta). Due to increased anthropogenic land disturbance activities such as bitumen extraction, reclamation of surface mineable areas will also increase. The resulting reclaimed areas will tend to be sodium-enriched compared to …
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Distribution of Carrion Beetles (Coleoptera: Silphidae) in Different Geographic Regions of Virginia
… with a special consideration for Nicrophorus species. The seasonal abundance and diversity of silphid beetles in Montgomery County, Virginia, was also examined. Baited pitfall traps were used to sample beetle distribution and abundance, and were placed in each of the five geographical regions …
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Subtidal concrete piling fauna in Monterey Harbor, California
… organisms were identified and an evaluation of species abundance in each sample was made. Data are given by a Table of Species with abundance in each sample, a Species List with comments on particular organisms, drawings representing the more prominent animals observed and in situ photographs of …
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Abundance Trends and Drivers of Change in Freshwater Fish Communities of the New River Basin
Habitat destruction/alteration and non-native species are widely considered the two most serious threats to biodiversity within freshwater ecosystems, which are among the most threatened in the world. I examined the effects of these factors, specifically focusing on land use and non-native species …
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Baited remote underwater video survey of reef fish in the Stilbaai marine protected area, with an assessment of monitoring requirements
Long-term monitoring of changes in species abundance and community composition within marine protected areas (MPAs) is essential to assess whether conservation goals are being reached. The costs, logistics and sampling biases inherent to traditional monitoring methods limit sustainable monitoring …
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Rodent species composition, abundance, richness, and diversity amongst different habitats in two villages in the Mukwe Constituency, Kavango East region of Namibia
… such as environmental disturbances. Some rodent species such as Mastomys natalensis are agricultural pests and have caused a lot of damage to crop harvests and peoples’ belongings. Additionally, rodents serve as vectors for deadly diseases which they can transmit to humans. The aim of this study …
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USING DEEP LEARNING AND UAV IMAGERY TO DETECT ELKHORN CORAL IN ST. CROIX’S EAST END MARINE PARK
… palmata</em>, is an important reef building species that promotes species abundance and other ecological services to the communities in the US Virgin Islands. We captured high resolution imagery of a reef in St. Croix’s East End Marine Park using a Wingtra One UAV. We then used deep learning …
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An analysis of spatial percolation structures using a network approach
… theory to the modelling of distribution and species abundance at different seales. We mainly focus on the way percolation theory was used to compare two diffcrcnt spatial patterns, particularly the random and the aggrergated distribution.
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Examining Avian Communities in Wetlands at Multiple Spatial Extents
… (NLCD) to develop a set of spatially-explicit abundance models for each of 31 species of wetland-breeding birds. Independent variables in these models included combinations of three different aquatic habitats as well as other land cover types that could potentially influence species abundance. …
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Effects of fire and treefalls on Japanese climbing fern and native species groundcover in a restored longleaf pine savanna
… windstorms and fires promotes native herbaceous species, but also promotes invasion of Japanese climbing fern (Lygodium japonicum). Lygodium japonicum is an invasive fern with subterranean rhizomes and copious spore production invading pine savannas along the southeastern Gulf Coast Region. This …
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Plant community restoration on mima mounds at Turnbull National Wildlife Refuge, WA
<p>"Prevention and management of exotic plant species invasion can diminish their negative ecological and economic impacts and maintain ecological functions provided by native species. This is particularly important in rare landscapes that provide essential habitat. The most successful management …
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DISTRIBUTION AND MOLECULAR ANALYSIS OF AVIAN MALARIA VECTORS ON FOUR CENTRAL VIRGINIA PROTHONOTARY WARBLER (PROTONOTARIA CITREA) BREEDING SITES
… disease that has decimated numerous bird species. This study sought to identify the vectors of avian malaria at four central Virginia Prothonotary warbler breeding sites. Twenty one thousand mosquitoes were collected and Culex salinarius, Cx. erraticus, and Cx. pipiens/restuans were found …
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A comparison of floristic diversity in old-growth versus mid-successional secondary-growth hardwood forests of the White Mountain National Forest, New Hampshire, United States
… whether managed forests will ever regain the species diversity of old-growth stands. While succession and response to disturbance of tree species has been extensively researched, little similar effort has focused on understory herbaceous communities. This study conducted large-scale, …
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