Sökning: "EASTERN NORTH-AMERICA"
Visar resultat 1 - 5 av 9 avhandlingar innehållade orden EASTERN NORTH-AMERICA.
1. Wintertime compound extremes in Europe and North America : from dynamics to predictability
Sammanfattning : This thesis examines the co-occurrence of wintertime low temperature extremes (cold spells) over North America and wet or windy extremes over Europe. Prolonged (≅ 5 days) North American cold spells can be associated with both upstream and downstream anomalous large-scale atmospheric flows, the latter modulating extreme weather occurrences over Europe. LÄS MER
2. Genomic insights into the population history of circumpolar Arctic dogs
Sammanfattning : The Siberian and North American Arctic have both borne witness to numerous migrations of humans and with them their dogs. This PhD thesis is based on whole genome data from 22 Siberian dogs and 72 North American Arctic dogs, in addition to 186 mitochondrial genomes Siberian and North American Arctic dogs. LÄS MER
3. Nitrate stable isotopes and major ions in snow and ice from Svalbard
Sammanfattning : Increasing atmospheric reactive nitrogen (Nr), as consequence of human activities, has generated accumulation of nitrate (NO3-) in Arctic regions. The Arctic has fragile nitrogen limited ecosystems that can be altered by increases of dry or wet deposition of Nr. LÄS MER
4. Ecology of red admiral migration
Sammanfattning : The red admiral (Vanessa atalanta) is a migratory butterfly that can be found in North America, North Africa, Europe and some parts of Asia. In Europe the main part of the population spend winter in the Mediterranean region and the following spring leave this area to breed further to the north. LÄS MER
5. Morphological and Molecular Phylogenetic Studies in Neotropical Gentianaceae
Sammanfattning : The Gentianaceae of the Neotropics are a diverse taxonomic group representing several evolutionary lineages. The phylogenetic relationships of neotropical gentians are discussed based on cladistic analyses of morphological, trnL intron, and ITS 1 sequence data. LÄS MER