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 45 for “"Spring Migration"”.
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Patterns of Nutrient Acquisition in Canvasbacks During Spring Migration
… reserves (fat, protein, and calcium) acquired on spring staging areas to be used for reproduction. My objectives were to: 1) describe changes in body reserves during spring, 2) examine alternative uses for body reserves in spring migrants, and 3) identify where reserves are acquired.</p> …
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Environmental Factors Influencing Spring Migration Chronology of Lesser Scaup (Aythya affinis)
Weather likely affects the timing and rate of migration by waterfowl to their breeding grounds. I hypothesized that timing of migration by lesser scaup during spring is affected by annual variation in temperature, precipitation and ice cover. I used satellite telemetry data, waterfowl survey data …
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FORAGING BEHAVIOR OF DUCKS DURING SPRING MIGRATION IN THE WABASH RIVER REGION, ILLINOIS
… some aspect of the system. I used a guild of spring migratory ducks as a model system and manipulated food abundance in areas differing in presumed risk to assess the relative effects of food abundance, predation risk, competition, and life history characteristics on foraging strategies used …
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Nocturnal Habitat Selection During Spring Migration by American Woodcock (Scolopax minor) in Central Kentucky
… and wintering grounds, little is known about spring migratory ecology. This study assessed nocturnal roosting habitat of American woodcock through the use of night spotlighting techniques. The study was conducted on the Blue Grass Army Depot and the Central Kentucky Wildlife Management Area, …
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Spring Migration Ecology of American Woodcock (Scolopax minor) in the Central Management Region of the United States
… are interested in gaining knowledge of spring migration ecology to improve migration habitat and mitigate population decline. I captured six woodcock with mist and hand nets on nocturnal habitat and marked them with VHF (very high frequency) transmitters in northern Arkansas. I …
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Understanding the spring migration ecology of Sora and Virginia Rail in central Illinois: a study utiilizing automated telemetry
… of wetlands. Detailed information about the spring migratory connectivity and stopover ecology of Sora and Virginia Rail is lacking. Much of the wetland habitat required by these secretive marsh birds has been lost across the Midwest over the last 200 years due to agriculture and urban …
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Factors affecting Western Atlantic red knots (Calidris canutus rufa) and their prey during spring migration on Virginia's barrier islands
… conservation planning. Every year during spring migration, thousands of federally threatened (U.S.A.) and endangered (Canada) migratory Western Atlantic red knots (Calidris canutus rufa, 'red knot') use Virginia's barrier islands as stopover habitat to regain the fat required to continue …
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Bird Utilization of Woodland Habitat in the Eastern Quarter of South Dakota
… quarter of South Dakota were studied during the spring migration, reproductive, and winter seasons. The relative importance of these three habitats and multi-row shelterbelt habitat was evaluated using bird species diversity (BSD), bird population density, and habitat preferences of individual …
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Investigating factors influencing blue-winged teal movements and habitat selection during the nonbreeding season
[EMBARGOED UNTIL 08/01/2026] Migration is an important life history strategy used by waterfowl to access seasonally available resources. However, migratory events in both autumn and spring are energetically demanding and migration strategies that minimize energy expenditure could offer …
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Hepatic Element Concentrations and Gross and Histological Examinations of Spring Migrating Lesser Scaup (Aythya affinis) in the Upper Midwest
… important elements in lesser scaup during spring migration, (2) to compare element concentrations by gender and collection location, (3) to compare the data of this study to published data from other studies of lesser scaup, and (4) to perform gross and histological examinations of lesser …
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The Impact of Wind Turbines on the Distribution of Wintering and Migrating Raptors
… of raptors on Amherst Island during winter and spring migration for three years before (2015, 2016, 2017) and three years after (2019, 2022, 2023) the windfarm was built. We recorded 3,277 observations of raptors which we used to test whether the turbines affected raptor distributions, …
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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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Using Light-Level Geolocation to Investigate the Carry-Over Effects of Long-Distance Migration on the Reproductive Success of Dunlin (Calidris Alpina Hudsonia)
Avian migration strategies can have lasting effects on individual fitness in subsequent seasons. These carry-over effects are difficult to study in migratory species because of the geographical separation between breeding and non-breeding sites. I used light-level geolocation to examine, for the …
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The Effects of Weather on Wetland Habitat Conditions and Shorebirds During Spring and Fall Migration in Northwest Minnesota
… off-refuge wetlands varied between 100% in spring 2002 to a low of 5% in fall 2003. As a result of these variable weather conditions, a variety of wetlands were necessary to support migrating shorebirds. Overall, the majority of shorebirds were observed on the refuge. In the drier year, over …
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Decision-making and demography of greater white-fronted geese
… at least eight populations with distinct migration strategies. There are three populations in North America: the Pacific Flyway, midcontinent, and Tule white-fronted geese. The Pacific Flyway and midcontinent populations have both exhibited increases in recent decades. In contrast, the …
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Stopover behavior and refueling physiology in relation to migration distance in Wilson's Warblers (Wilsonia Pusilla)
… how inter-individual variation in total migration distance within a species affects stopover behavior and refueling rate. Wilson’s Warbler is a leapfrog migrant passerine that winters in Central America and breeds throughout North America. Birds were captured in the spring and fall of …
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A System-Level Analysis of Migratory Shorebird Habitat Use, Diet, and the Influence of Climate-Driven Ecosystem Change in the Virginia Barrier Islands
… coastal staging habitats to refuel during migration, but these sites are threatened by climate change. The Virginia barrier island system supports over 100,000 shorebirds annually, including federally threatened red knots (Calidris canutus rufa) and other state and regional species of …
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Born to fly - migratory strategies and stopover ecology in the European Wadden Sea of a long-distance migrant, the Bar-tailed Godwit (Limosa lapponica)
… of Bar-tailed Godwits stopover on their migration between wintering and breeding areas. Birds of the European population stayed during spring stopover for 30-40 days in the study area. Birds were extremely site faithful to their spring stopover site showing an annual mortality of 17-26 %. …
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White storks (Ciconia ciconia) of Eastern Germany: age-dependent breeding ability, and age- and density-dependent effects on dispersal behavior
… population. I asked whether and how the major spring migration direction interacts with dispersal directions of white storks: in different age, and under different population densities. The proportion of breeding individuals increased in the first 22 years of life and then decreased suggesting, …
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Quantifying population- and individual-level processes in Greenland white-fronted geese (Anser albifrons flavirostris) for holistic conservation planning
… areas, including cold temperatures during late spring and precipitation during brood-rearing. I also found that earlier spring phenology on staging areas negatively affected reproductive rates of geese staging in southern Iceland and increased snow on breeding areas negatively affected …
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