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 17 of 17 for “"neotropical migrant"”.
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The effect of urbanization on the stopover ecology of neotropical migrant songbirds
I conducted spring migration point counts and vegetation surveys at 29 forest patches in the Chicago, IL metropolitan area in 2012 and 2013. The forest patch selection was designed to test the effects of patch size, distance from the Lake Michigan shoreline and degree of urbanization. I conducted …
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A comparison of the ecology and population dynamics of a neotropical migrant landbird, the hooded warbler, in winter and summer
… of avian 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 …
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Prothonotary Warbler (Protonotaria citrea) Plumage as an Indicator for Infection: the Relationship between Haemosporidia Infection and Breast Feather Reflectance in a Neotropical Migrant Passerine
… (Protonotaria citrea) (n=169), insectivorous Neotropical migrant passerines, throughout the Ultraviolet (UV) and human visible light spectra and examines the relationship between Haemosporidia (pathogen causing Avian Malaria) infection and feather reflectance (n=41). Reflectance was …
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Migration Plasticity as an Adaptation to Climate Change: The Spatial Distribution and Abundance of a Subset of Neotropical Migrant Landbirds Wintering in the Northeastern United States
… supposed increase in December presence of seven neotropical migrant landbirds near the northern edge of their winter ranges. CBC data and historical weather data from the U.S. Historical Climatology Network (USHCN) were analyzed to confirm the northward shift in average abundance over time among …
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Bird use of avocado farms and intact forest in the Dominican Republic
… 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 farms and intact forest, as well as …
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Canopy Characteristics Affecting Avian Reproductive Success: The Golden-cheeked Warbler
… and fragmentation are of particular concern for Neotropical migrant songbird populations. Additionally, different avian species respond differently to the surrounding environment at different spatial scales. Thus, multi-scale studies on bird abundance and reproductive success is necessary for …
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Assessing Black-capped Vireo (Vireo atricapillus) Breeding Habitat based on Size, Spatial Distribution, and Plant Species in Shrub Mottes at Kerr Wildlife Management Area, Texas
… atricapillus) (hereafter, BCV), an endangered Neotropical, migrant songbird, inhabits semi-open areas ranging from a maturing scrubland to more open habitats. An important factor of BCV habitat is heterogeneity. BCVs inhabit areas with greater heterogeneity in vegetative cover. Vegetative cover …
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Habitat Selection by Yellow -Headed Blackbirds
… habitat selection at various spatial scales in a neotropical migrant, the Yellow-headed Blackbirds (Xanthocephalus xanthocephalus). This research was conducted in two declining populations in northeastern Illinois. I found that at the largest spatial scale, immigrants appear not to settle in the …
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Effects of forest fragmentation on the demography of ovenbirds (Seiurus aurocapillus) in the boreal forest
… factor influencing the decline of this and other Neotropical migrant species.
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Aspects of ecosystem health in the Colorado River Delta, Mexico
… (Empidonax traillii extimus ) is an endangered neotropical migrant with only 300-500 breeding pairs. The objective of the second study was to determine the presence/absence of this bird in the Colorado River delta. Surveys were conducted from June to July, 1999 and from May to June, 2000 using …
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Habitat selection, food availability, and reproductive success of southwestern willow flycatchers on the South Fork Kern River, California
… traillii extimus) is a federally-endangered neotropical migrant that breeds in the southwestern United States. The population of southwestern willow flycatchers on the South Fork Kern River in California was once thought to be one of the largest E. t. extimus populations. It declined from 38 …
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Avian Community Structure Associated With Woodland Habitats in Fragmented and Unfragmented Lanscapes in Western South Dakota
… in woodland habitats. Woodland obligate and Neotropical migrant species richness values were higher in nonfragmented landscapes whereas more species of edge and generalists were observed in fragmented landscapes. Greater vegetative diversity of natural woodlands attracted significantly more …
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Studies of the Annual Cycle of the Swallow-Tailed Kite (<em>Elanoides forficatus</em>): Migration, Habitat Use, and Parasites
… Kite (Elatwides forficatas) is a rare Neotropical migrant raptor that breeds in the United States and winters in South America. Despite intense conservation concern, relatively little is known about the factors that may limit Swallow-tailed Kite populations. I examined three aspects of …
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Winter habitat use by Blackburnian Warblers (Dendroica fusca) in Los Amarillos, Colombia
Blackburnian Warblers (Dendroica fusca) were observed in their wintering grounds in a High Andean native secondary forest in Colombia between September 1993 and May 1994. The main objective of the study was to determine the relationships between the Blackburnian Warblers and the habitats where they …
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Species-Habitat Relationships for the Breeding Birds of a Longleaf Pine Ecosystem
… and hardwood forests, including many Neotropical migrant songbirds, but will greatly benefit members of the longleaf pine assemblage, such as the Red-cockaded Woodpecker, Brown-headed Nuthatch, Prairie Warbler, and Bachman's Sparrow. Breeding bird distributions in this fire-influenced, …
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The Effect of Area on Resource Competition among Migrant Birds at a Stopover Site
… in Fall 2007 and Spring 2008, the density of migrant birds was higher in smaller fragments. In all three field seasons, the density of resident birds was higher in smaller fragments than in larger fragments. Birds did depress arthropod abundance in Spring 2007 and 2008, but there was no …