Sökning: "Eurasia"
Visar resultat 16 - 20 av 45 avhandlingar innehållade ordet Eurasia.
16. Migratory behavior and its genetic basis in willow warblers Phylloscopus trochilus
Sammanfattning : Right before northern hemisphere’s summer shifts to autumn small insect-eatingbirds start lengthy journeys to tropical regions. It is well established that temporarylack food and annual changes in weather are the ultimate reasons for this behavior.On a proximal level however, the process is poorly understood. LÄS MER
17. Tectonic History and Present-Day Deformation in the Zagros Fold-Thrust Belt
Sammanfattning : This thesis uses various approaches such as observation of satellite images, field investigations, analogue modeling and GPS measurements to constrain deformation of the basement and sedimentary cover of the Zagros fold-thrust belt in time and space.Focal mechanism solutions of most earthquakes indicate that deformation in the Zagros basement is due to shortening and thickening through numerous thrust faults. LÄS MER
18. Evolution of Flowering Time in the Tetraploid Capsella bursa-pastoris (Brassicaceae)
Sammanfattning : Although polyploidy is believed to be a major source of evolutionary novelty, few studies have examined the genetic basis of phenotypic variation in wild polyploids. In this thesis I have studied the genetic basis of flowering time variation in the wild tetraploid crucifer Capsella bursa-pastoris, as well as the evolutionary history of this species. LÄS MER
19. Round goby Neogobius melanostomus in the Baltic Sea – Invasion Biology in practice
Sammanfattning : Human mediated transfer of non-indigenous species is considered to be a major threat to global biodiversity. The Ponto-Caspian round goby (Neogobius melanostomus), which has established populations in various regions in Eurasia and North-America, was first observed in Gulf of Gdańsk, Baltic Sea, in 1990. LÄS MER
20. On the interaction between ice sheets and the large-scale atmospheric circulation over the last glacial cycle
Sammanfattning : The last glacial cycle (c. 115-12 kyr BP) was the most recent in a series of recurring glaciations of the subpolar continents. Massive ice sheets evolved in Eurasia and North America, which, at their maximum, were of continental scale and together lowered the global sea-level by approximately 100 m. LÄS MER