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 20 for “"Bird habitat"”.
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Post-fire vegetation and bird habitat use in piñon-juniper woodlands
… type in the western US and provides breeding habitat for many obligate or semi-obligate bird species. Similarly, this system is supported by a critical mutualism, where the regeneration and infilling of these trees is reliant on several bird species that disperse piñon pine and juniper seeds. …
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Non-Game Bird habitat Associated With Haul Roads and Surface Mining for Bentonite Clay
… 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 following habitat …
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Influence Of Landscape Spatial Patterns And Land Use Planning On Grassland Bird Habitat Occupancy In Chester County, Pennsylvania
Throughout their range, North American grassland birds as a group have shown steeper and more widespread population declines than any other avian guild. Grassland bird decline corresponds to habitat loss, landscape fragmentation, agricultural intensification, and changes in land management. In …
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THE ECONOMIC VALUE OF PRESERVING AND RESTORING MIGRATORY BIRD HABITAT TO RESIDENTS OF THE PACIFIC FLYWAY: A MIXED METHODS STUDY
… place on preserving and restoring migratory bird habitat and is comprised of three chapters: Chapter 1: The Economic Value of Preserving and Restoring Migratory Bird Habitat to Residents of the Pacific Flyway: A Stated Preference Survey Chapter 2: The Value of Conservation: A Focus Group …
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A Comparison of Land Use and Land Cover in Public Lands of the Northwestern Great Plains and High Plains Ecoregions and the Implications For Grassland Birds
<p>Loss and degradation of grassland habitat are driving forces that contribute to widespread declines of grassland birds in the United States. Many studies have evaluated habitat needs for the conservation of grassland birds, but the relative contribution of public lands in representing and …
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Inhabiting the interstitial: design experiments in aviary architecture and habitat creation
… the potential of urban interstitial spaces in bird habitat creation. An interstitial space is the space in-between, underneath, beyond, enveloped, and outside our traditional concepts of habitat and urban space. It is the space between spaces, the space that eludes maps, an aggregate of …
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Evaluating Population-Habitat Relationships of Forest Breeding Birds at Multiple Spatial and Temporal Scales Using Forest Inventory and Analysis Data
… have documented declines of forest breeding birds in the eastern United States, but the temporal and spatial scales of most studies limit inference regarding large scale bird-habitat trends. A potential solution to this challenge is integrating existing long-term datasets such as the U.S. …
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Utilization of natural nest sites by Eastern Bluebirds in southwestern Virginia
Eastern Bluebirds (<i>Sialis sialis</i>) were found to be utilizing natural nest sites in the vicinity of Blacksburg, Virginia, during 1976 and 1977. Forty-seven natural nest sites, 37 in fencepost cavities and ten in tree cavities were discovered by driving roads in rural areas, scanning fencerows …
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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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Habitat selection and breeding ecology of grassland birds in areas managed with fire and grazing
… have contributed to steep declines in grassland bird populations in the Midwest. On top of habitat loss, the cessation of historic disturbance regimes on remaining grasslands has served to homogenize vegetation structure. Because grassland birds evolved in the context of the interactive …
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Avian Community Structure Associated With Woodland Habitats in Fragmented and Unfragmented Lanscapes in Western South Dakota
… increase agricultural production is decreasing habitats for grassland birds at alarming rates in the northern Great Plains. Establishment of planted woodlands (e.g., shelterbelts and windbreaks) has further fragmented remaining grasslands and created abrupt boundaries that exacerbate edge …
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Landscape Ecology of Birds on Mount Leconte, Great Smoky Mountains National Park
<p>Landbirds form a significant component of wildlife resources in the Great Smoky Mountains National Park. The present study explored how forest structure and composition of deciduous-coniferous ecotones influenced diversity, richness, and relative abundance of bird species and how bird species …
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Modelling mitigation of bird population declines in the UK through landscape-scale environmental management.
… a global scale despite efforts to the contrary. Birds are effective indicators of ecosystem health, occurring in almost every habitat on Earth. However, many UK birds have declined since the 1960s, and are now classified as endangered or rare. Knowledge of factors influencing the presence and …
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Diversity, Ecology, And Conservation Of Bird Communities Of Polylepis Woodlands In The Northern Andes Of Peru
Montane birds are sensitive to a wide variety of human activities, among which climate change is of special concern. Among the most diverse and specialized montane bird communities is that of Polylepis forests in the High Andes (> 3,500 m). Unfortunately, the ecology of birds associated with …
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Effects of forest fragmentation on the demography of ovenbirds (Seiurus aurocapillus) in the boreal forest
The demography of ovenbirds (Seiurus aurocapillus) was compared in landscapes highly fragmented by agriculture, moderately fragmented by commercial harvesting, and in contiguous boreal forest of Saskatchewan. Various survey techniques demonstrated that ovenbirds were less common in small, isolated …
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Ecological role of mining ponds in Southern Coastal Mines, Namibia
… to qualify as a viable alternative ecological habitat, rather than restoring them to their original state as backfilled, revegetated dune areas. The study area, approximately 75 kilometres in length, was divided into north, middle and south sections, according to the age and status of mining …
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Assessing processes of long-term land cover change and modelling their effects on tropical forest biodiversity patterns – a remote sensing and GIS-based approach for three landscapes in East Africa
… army ant Dorylus wilverthi and of ant-following birds, GIS operators (i.e. focal and local functions) and statistical tests (i.e. OLS or SAR regression models) were combined into a spatial modelling procedure. Abundance data on three guilds of birds differing in forest dependency were directly …
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The effect of urbanization on the stopover ecology of neotropical migrant songbirds
… were important factors for many models. Bird species determined to be area sensitive in previous studies were associated with large patches during migration. While path size, distance from the shoreline and urbanization were not frequently selected for models of the entire avian …
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Incidence, mechanisms, and consequences of adaptive habitat selection by the dickcissel (Spiza americana)
… preferences when faced with the choice of habitats in which to settle. A key question that arises from these behaviors is whether preferences represent adaptive habitat selection—do animals occupying preferred habitats incur fitness benefits? A prediction based on natural selection suggests …