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.
Results
Showing 1 to 20 of 38 for “"Migratory birds"”.
-
Magnetic orientation in migratory birds
Wie nehmen Zugvögel das Magnetfeld wahr und wie nutzen sie diese Information, um sich zur Zugzeit zu orientieren? Das sind die Schlüsselfragen meiner Doktorarbeit. Cryptochrome werden als potentielle Magnetfeld-Rezeptoren vorgeschlagen. Ich konnte vier Cryptochrom-Varianten in der Retina von …
-
Large-scale habitat relationships of neotropical migratory birds
… of a mosaic of habitat elements. I surveyed songbirds using a variation of the variable circular plot method during the 1994 and 1995 breeding seasons on 20 sites ranging in size from 50 to 72 ha on the Quantico Marine Corps Base, VA. Measures of community performance including species diversity, …
-
MOVING THE GOALPOSTS: MIGRATORY BIRDS IN A CHANGING WORLD
Billions of birds undertake migratory movements each year, traveling distances that range from several hundreds to tens of thousands of kilometers. Migratory birds must be flexible enough to cope with the fluctuating conditions they encounter during these journeys and at their destinations. …
-
Orientation in migratory birds: orientation mechanisms and their underlying neurobiological background
… the magnetic compass orientation of night-migratory birds. Behavioural observation show that night-migratory garden warblers (Sylvia borin) use stereotype sideways movement of the head (head scans) to detect the reference direction provided by the Earth's magnetic field. The detection of …
-
Characterization of the Bacterial Microbiome of Exotic Tick Species Collected from Migratory Birds
<p>Migratory birds often serve as natural/accidental hosts to ectoparasites like ticks (predominantly immature stages) and are known reservoirs of several pathogens transmitted by ticks. Parasitizing these birds, exotic tick species often hitch rides to non-native ecological niches, bringing along …
-
Potential Effects of Climate Change on the Distribution and Migration of European Breeding Migratory Birds
… impacts of climatic change on Afro-Palaearctic migratory birds by investigating simulated changes in breeding and non-breeding distribution. Methods: Generalised Additive Models were used to determine those climatic variables that produced the most robust species distribution models. Tests on …
-
Effects of Hurricane Disturbance on the Stopover Ecology of Intercontinental Landbird Migrants in Coastal Louisiana
… have considered the impact of weather events on migratory birds during stopover, and essentially none on how hurricanes affect their stopover biology during spring passage. About two thirds of eastern North American forest breeding bird species migrate twice annually between temperate breeding …
-
Habitat Selection by Yellow -Headed Blackbirds
Migratory birds have the ability to select a breeding site from a large number of sites across a large geographic area. Therefore, one might expect that migratory birds would select the site where they would realize the greatest fitness. However, little is known about how and why migratory birds …
-
Tick Infestations and Their Consequences for Migratory Songbirds During Spring Stopover
<p>Migratory birds face a number of challenges during their seasonal movement from tropical/sub-tropical Central and South America to more temperate North America. Maintaining health during migration is of particular concern. This study seeks to understand how haematophageous ectoparasites, such as …
-
Spring Landbird Migration along the Northern Coast of the Gulf of Mexico: Multi-Scaled Investigation of Stopover Ecology Within an Urbanized Landscape
… and their value for energetically constrained migratory birds. There is urgency in conserving coastal habitats and identifying important stopover areas across the entire GOM to create a framework for monitoring critical habitats, design management and restoration strategies, and inform …
-
Post-fledging habitat use and movements of worm-eating warblers in the Tennessee River Gorge
Declines in Neotropical migratory birds have been observed over the past several decades. Species with particular habitat needs, termed ‘specialists’, are especially at risk given continual habitat loss. These downward trends have prompted researchers to investigate species’ life histories and …
-
Seizing a species : the story of the Great Salt Lake brine shrimp harvest
… are an important food source for millions of migratory birds. The harvest was almost entirely unregulated during this period. Unlike other fisheries, where industry members have fought government intervention, many of the harvesters called on the state to increase oversight. Scientists hired …
-
The Role of Long Distance Movement and Genetic Adaptation on the Evolution of West Nile virus in the New World
… is maintained in an epizooitic cycle involving birds and mosquitoes. After a long history of circulation in the Old World, WNV was introduced into the US and identified in the New York Metropolitan Area during the summer of 1999. While the initial outbreaks were restricted to the northeastern …
-
Negotiating for nature: Conservation diplomacy and the Convention on Nature Protection and Wildlife Preservation in the Western Hemisphere, 1929--1976
… a broad-based treaty for the protection of migratory wildlife at the Convention on Nature Protection and Wild Life Preservation in the Western Hemisphere. This dissertation examines the unique set of questions, problems, and concerns framers of the Convention dealt with in the development of …
-
The nocturnal flight calls of migratory songbirds: interspecific variation in the “zeep” complex and intraspecific variation across North America
The nocturnal flight calls of birds are short vocalizations, produced primarily during migration. Although these calls offer a unique opportunity for studying avian migration, there has been little research into many aspects of these calls, such as the species-specificity of the calls of closely …
-
The effects of regional weather patterns on the migration of birds and Lepidoptera to a coastal migration “hotspot” in East Kent and possible changes in occurrence in response to global climate change
… patterns on the migration of three groups: migratory breeding birds, vagrant birds and migratory moths and how climate change could affect the weather patterns and hence migration to the UK. Using long term-data (30 years – 1990–2020) provided by the Met Office and Sandwich Bay Bird …
-
The Role of Avifauna in Paleodiet Reconstruction : An Arctic Case Study
This thesis explores the importance of birds in paleodietary reconstruction based on stable isotope analysis, using faunal remains from Arctic contexts as a case study. In the Arctic, migratory birds and their eggs have been important seasonal resources for hunter-gatherer populations, and while …
-
Behavioral Investigation of the Light-Dependent Magnetoreception Mechanism of Drosophila melanogaster
… effects in vertebrates (e.g. amphibians and birds); and 3) produces axially symmetrical patterns of response with respect to the geomagnetic field. Additionally, tests of adult Drosophila under low and high intensities of monochromatic long wavelength light revealed a similar behavioral …
-
Trobicúlidos y trombiculiasis en La Rioja
… Trombiculid larvae removed from potentially migratory birds were classified as N. inopinata. In our environment, there is no evidence of Rickettsia spp., A. phagocytophilum, Borrelia spp., C. burnetii, Bartonella spp. or O. tsutsugamushi infection in trombiculid larvae. Nevertheless, their …
Page 1 of 2