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 63 for “"bird populations"”.
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Evolutionary dynamics of bird populations in Southeast Asia
… and genetic diversity of rainforest birds in Southeast Asia. (1) In the Oriental Dwarf Kingfisher (Ceyx erithaca) complex, the birds are highly polymorphic in plumage. Quantitative analysis of this variation indicated that a large proportion of birds in Sumatra, the Malay Peninsula …
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The influence of habitat disturbances on bird populations
… wildlife clearings, and forest cover types on bird populations in southwestern Virginia were evaluated. Timber was cut two to six years prior to the study. The oak, hickory, poplar, and white pine; and mixed oak cover types were found on bottom slope sites. Mixed oak-pine and mixed oak occurred …
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Assessing the potential contribution of roads to variation in British bird populations
Roads and their traffic are known to affect bird species at both individual and population levels. Collisions with vehicles can cause direct mortality, and noise, light and chemical pollution can have sub-lethal impacts. Additionally, roads can cause habitat degradation, fragmentation and edge …
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An Analysis of the Ecological Distribution of Breeding Bird Populations in Eastern North America
Made available in DSpace on 2014-12-04T22:45:43Z (GMT). No. of bitstreams: 1 0002065.pdf: 11129785 bytes, checksum: 9a1e00cc9e97ff44ffbeb39b3ed9a3ff (MD5) Previous issue date: 1950
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An Analysis of Bird Populations in Relation to Plant Succession in Algonquin Park, Ontario
Made available in DSpace on 2014-12-04T22:45:58Z (GMT). No. of bitstreams: 1 0016412.pdf: 13766890 bytes, checksum: 43946dab15dba92600f14103896600a6 (MD5) Previous issue date: 1956
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Breeding bird populations in relation to the vegetation structure of abandoned contour mines in Southwest Virginia
… to investigate relationships between breeding bird population parameters and structural aspects of the disturbed area vegetation. The territorial mapping method was employed to census bird populations. The number of breeding species, number of breeding pairs, bird species diversity, and number …
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Rethinking Urban Green Infrastructure as a Means to Promote Avian Conservation
… leading to decline and homogenization in world bird populations. Birds are fundamental and intricate species in ecosystems, and even in urban areas, act as indicator and regulator species contributing to healthy ecosystem function. While many cities have recognized the economic and social …
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A comparison of the ecology and population dynamics of a neotropical migrant landbird, the hooded warbler, in winter and summer
… ecology is to determine where and how migrant bird populations are limited. I studied the habitat selection, foraging ecology, and population dynamics of the Hooded Warbler (Wilsonia citrina) during the breeding season in Maryland, USA, and during the overwintering season in Quintana Roo, …
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Effects of Grazing Intensity and Temporal Application of Grazing Treatments on Nongame Birds in North Dakota Mixed-Grass Prairie
… including the habitat selection of breeding birds. Grazing, mainly for livestock production, is still an important land use practice and is one that impacts millions of hectares on both public and private land in the United States. In North Dakota alone, various grazing practices affect over …
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The Effects of Global Change on Avian Biodiversity
… differences in reporting rates across eBird and the North American Breeding Bird Survey (BBS) and assessed the sources of these biases to understand how each dataset can best be used to monitor bird populations. While more species are reported to eBird, there are generally lower counts …
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The population status, breeding success and diet of Subantarctic Skuas two decades after the feral cat eradication on Marion Island
… can have detrimental impacts on endemic bird populations and thus disrupt predator-prey relationships. In cases where a predator is dependent on a certain prey species, the distribution, abundance, breeding success and diet of a predator can reveal disruptions in their prey abundance and …
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Unsupervised learning to quantify differences in song learning of experimental zebra finch populations
… particularly for comparison of experimental populations across development. Sparse convolutional feature extraction, a method previously used to analyze other natural sounds, is applied to zebra finch song here. The results of feature extraction were used to develop metrics that were applied …
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Population and community responses to anthropogenic environmental changes
… changes have on plant communities and bird populations. Chapter one investigates the influence of nutrient deposition on native prairie grass communities. I show that soil phosphorus levels alter plant diversity by changing the degree to which mycorrhizae benefit plant species. Chapter …
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Some aspects of the biology and host-parasite interactions of Isospora spp. (Protozoa: Coccidiida) of passerine birds
In wild bird populations parasites are at least as important as predators. The subject of this work was Isospora, a genus of intestinal coccidia that has been rarely studied in passerine birds. We established a method of estimating the intensity of Isospora infection and showed diurnal periodicity …
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Birds in Residential Metropolitan New Orleans Neighborhoods and Their Relationships to the Batture and Yard Vegetation
… were surveyed in order to determine how bird populations responded to distance from the batture, percent canopy cover, stem counts, and understory vegetation. Surveys were conducted in the spring and summer of 2010. It was found that batture birds, urban birds, and pooled birds all had …
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Geospatial Analysis of Forest Fragmentation and Connectivity in Virginia
… region and forest types on Virginia's populations of Wood Thrush and Ovenbird. This assessment identified the difference in effects of variables on bird populations depending on the scale at which the analysis is carried out. Third and final analysis combined the first two assessments …
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The conservation sacrifice : how far New Zealand will go to save its birds
… New Zealand has no native land mammals, its bird species are poorly adapted to withstand predation from the mammals that have been introduced since humans first arrived on the nation's shores. The country is now home to nearly 170 native bird species, most of which are declining and …
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A theoretical analysis of an audio-index
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Fisheries and Wildlife, 1961
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Bioacoustic Studies of Population Size and Microdialects in an Island-Living Savannah Sparrow Population
… for studying the behaviour and ecology of wild birds. In this thesis I use bioacoustic monitoring as a tool for studying Savannah Sparrows (Passerculus sandwichensis). In my first data chapter, I tested the accuracy of passive acoustic monitoring in estimating population size and annual survival …
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