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 27 for “"bird diversity"”.
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The effects of habitat change on bird diversity and community structure in a mesic Savanna landscape
… 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 effects on biodiversity could be positive or negative. Habitat heterogeneity, in …
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Assessment of bird diversity, feeding guild and avitourism potential in Pulau Tinggi Marine Park, Mersing, Johor, Malaysia.
… role in providing vital pitstop for migratory birds. Moreover, island birds are important models for Island Biogeography Theory. However, research on birds on Malaysian islands are lacking whereas most research mainly concentrated on marine lives. Thus, a study was conducted in Pulau Tinggi …
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Urban green infrastructures: an assessment of urban bird diversity, abundance and behaviour associated with green walls and street trees in Manchester and Salford, UK.
… observational surveying, data were collected on bird species richness and abundance at sixteen sites across the cities of Manchester and Salford, UK, and, along with bird behaviours, at eight green walls and adjacent street trees. There was a strong negative relationship between bird species …
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Habitat influences on avian diversity and reproductive success in western aspen forests
Aspen forests hold a high diversity of organisms, but these forests are declining in western North America. A major correlate of aspen decline is conifer encroachment, where conifer trees gradually replace aspen trees through competition for space and light. Conifer encroachment on an aspen stand …
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Habitat influences on avian diversity and reproductive success in western aspen forests
Aspen forests hold a high diversity of organisms, but these forests are declining in western North America. A major correlate of aspen decline is conifer encroachment, where conifer trees gradually replace aspen trees through competition for space and light. Conifer encroachment on an aspen stand …
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Bird Community Structure in Southwestern Missouri
… plot ranging from 1.3 to 1.4 ha were sampled for bird species diversity from late March through November, 1978. Breeding bird censuses were also conducted in each area during the nesting season. Overall bird species diversity (BSD) was highest in the cedar plot. Breeding bird diversity (BBD) was …
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The effects of urbanization on winter avian diversity: a citizen science and GIS study
… is inevitable, affecting many wildlife species. Birds have become a frequently used model species for studying the effects of urbanization on wildlife populations due to their environmental sensitivity and ease of observation. While previous studies have investigated changes in species richness …
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Bird use of avocado farms and intact forest in the Dominican Republic
… conservation priority area due to high rates of bird endemism and overwintering Neotropical migrant habitats, is seeing an increase of avocado farms and a subsequent forest loss. We conducted point-count bird surveys to determine how avian species richness and diversity differ between avocado …
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Biogeography and ecology of African waterbirds
Patterns of distribution and diversity for African waterbirds are investigated at the continental, sub-continental, ecosystem and species levels. The focal species is the Great White Pelican Pelecanus onocrotalus, one of South Africa's 'Red Data' bird species. The 'focal' ecosystem is Rondevlei …
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Non-Game Bird habitat Associated With Haul Roads and Surface Mining for Bentonite Clay
… investigate possible differences in density and diversity of birds in relation to distance from mining haul roads and various aged mine spoils. Winter bird surveys and breeding bird counts were conducted during 1977 and 1978. Bird density and diversity were estimated and compared between the …
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Species richness and composition of avifaunal communities in a complex Amazonian landscape
… 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 terra firme, whitewater and blackwater seasonally …
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Forests of the future: ecosystem services in a forest landscape facing significant changes
… does not always align with objectives for biodiversity conservation so I also explored how forest management affects bird diversity (as an indicator of wider biodiversity), using high-resolution remote sensing data to calculate a number of structural characteristics. Overall, wide-scale …
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Habitat use, nest success, and management recommendations for grassland birds of the Canaan Valley National Wildlife Refuge, West Virginia
Grassland bird populations have been declining due to increased habitat fragmentation, urbanization, and conversion of farmlands to other uses throughout the United States. However, idle hayfields and pastures in the eastern United States may provide adequate nesting habitat for grassland species …
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Diversity and Density of Shelterbelt Bird Communities
The number of bird species and the density of each species were monitored in 69 shelterbelts in eastern South Dakota during spring migration and breeding seasons in 1976 and 1977. A total of 44 different species of birds were found during breeding and 68 species during spring migration. …
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Bird Utilization of Woodland Habitat in the Eastern Quarter of South Dakota
Bird utilization of narrow, riparian woodland; riparian; block-like, tree claim; and linear, single-row windbreak habitats in the eastern quarter of South Dakota were studied during the spring migration, reproductive, and winter seasons. The relative importance of these three habitats and multi-row …
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A Landscape Approach to Grassland Bird Conservation in the Prairie Pothole Region of the Northern Great Plains
… of the most imperiled ecosystems, and grassland birds have experienced steeper and more consistent declines than any other group of birds in North America. Habitat-based planning tools are a cornerstone of conservation in forested ecosystems, but remain a novel approach in grasslands. In Chapter …
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A Landscape Approach to Grassland Bird Conservation in the Prairie Pothole Region of the Northern Great Plains
… of the most imperiled ecosystems, and grassland birds have experienced steeper and more consistent declines than any other group of birds in North America. Habitat-based planning tools are a cornerstone of conservation in forested ecosystems, but remain a novel approach in grasslands. In Chapter …
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Birds in coffee agroforestry systems of West Lampung, Sumatra
… studies have explored the relationship between birds and coffee gardens in Southeast Asia. This study examines the use of coffee gardens and other habitats by birds in the Sumberjaya and Pesisir regions. Birds and their habitat use were surveyed, as were structural and floristic vegetation …
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Grassland bird associations in a managed agricultural matrix
<p>Continued declines of grassland bird populations in the U.S. are largely attributed to grassland loss from conversion to agriculture. Habitat establishment efforts by the U.S. Department of Agriculture (USDA) may stem these declines given adequate ecological insight to guide management …
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Palaeobiology and flight capacity of volant palaeognaths (Pan-Palaeognathae: Lithornithidae): implications for the common ancestor of extant palaeognaths and early crown birds
Extant palaeognathous bird diversity comprises the flightless ratites (ostriches, rhea, kiwi, cassowaries, and emu), as well as the partridge-like tinamous that fly powerfully over short distances. As the sister clade of all other crown birds (Neognathae), insight into the biology of early …
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