Search for dissertations about: "corvus"
Showing result 1 - 5 of 11 swedish dissertations containing the word corvus.
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1. Hybrid zones and speciation – insights from the European crow hybrid zone
Abstract : In hybrid zones genetically differentiated populations meet and interbreed. As they result from ongoing divergence and potential speciation, such zones provide opportunities to study how different factors affect this process. The hybrid zone between the all black carrion crow (Corvus corone corone) and the grey and black hooded crow (Corvus c. READ MORE
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2. In the wake of a bird - Quantifying aerodynamic performance of avian flight
Abstract : Flight is an expensive form of locomotion, but also offers the ability to travel great distances at relatively low cost. Birds have developed various adaptations for optimizing flight performance. The main aim of this thesis is to identify how morphological variables in birds affect aerodynamic drag and flight performance. READ MORE
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3. Determinants of genomic diversity in the collared flycatcher (Ficedula albicollis)
Abstract : Individuals vary from each other in their genetic content. Genetic diversity is at the core of the evolutionary theory. Rooted in a solid theoretical framework developed as early as the 1930s, current empirical observations of genomic diversity became possible due to technological advances. READ MORE
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4. Genus Brachyspira in birds : phenotypes, phylogeny and pathogenicity
Abstract : Spirochaetes of genus Brachyspira colonize the large intestine of some mammals and birds, and cause intestinal disease and production losses in pigs and chickens. The precise significance of Brachyspira spp. colonization in birds, the bacterial species involved, and the epidemiology are incompletely understood. READ MORE
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5. The return of the wolf : effects on prey, competitors and scavengers
Abstract : Apex predators may have both direct and indirect effects on other species through predation and competition. I investigated the effects of wolves (Canis lupus) on prey species, competitors (including humans) and the scavenging guild after the re-colonization by wolves of the Scandinavian Peninsula. READ MORE