Search for dissertations about: "beringia"

Showing result 1 - 5 of 7 swedish dissertations containing the word beringia.

  2. 1. Phylogenetic and phyloclimatic inference of the evolution of Potentilleae (Rosaseae)

    Author : Mats H. Töpel; Göteborgs universitet; []
    Keywords : Potentilla; Ivesia; Horkelia; allopolyploidization; TGGE; Beringia;

    Abstract : Polyploidization has occurred many times during the evolution of angiosperms. Allopolyploidization is believed to be the process behind many of these genome duplications, and has resulted in a genetically diverse angiosperm flora. READ MORE

  4. 2. Effects of herbivory on arctic and alpine vegetation

    Author : Åsa Lindgren; Ove Eriksson; Jon Moen; Anders Angerbjörn; Ingibjörg S Jónsdóttir; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; herbivory; reindeer; rodents; functional traits; plant species composition; arctic; alpine; tundra; seed limitation; Carex bigelowii; Biology; Biologi; Plant Ecology; växtekologi;

    Abstract : The distribution of plant species and functional traits in alpine and arctic environments are determined by abiotic conditions, but also by biotic interactions. In this thesis, I investigate interactions among plants and herbivory effects on plant community composition and plant functional traits in three different regions: Swedish Lapland, Beringia (USA/Russia) and Finnmark (Norway). READ MORE

  5. 3. On the role of migration for the distribution of arctic birds - a circumpolar perspective

    Author : Sara Henningsson; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bird migration; broad-scale distributions; geographic breeding range; geography of migration; non-breeding range; barriers to migration; Arctic birds; evolution of migration routes;

    Abstract : Flexibility as well as constraints to the evolution of migration routes has the possibility of affecting large-scale patterns of geographical ranges of animals both by facilitating, but sometimes restricting, accessibility to and colonization of new regions. This dissertation concerns the broad-scale effects migration has on the distributional patterns of birds in the Arctic. READ MORE

  6. 4. Large carnivore population turnover and ecological change during the Late Quaternary

    Author : Erik Ersmark; Love Dalén; Jennifer Leonard; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Abstract : The cave lion (Panthera spelaea), the grey wolf (Canis lupus) and the brown bear (Ursus arctos) all shared an intercontinental distribution across the northern hemisphere during most of the Late Quaternary, and experienced repeated events of climate change. The cave lion went extinct at the end of the Pleistocene and although the wolf and the bear have survived until present day, recent human persecution has caused demographic bottlenecks and local extinctions. READ MORE

  7. 5. Evolutionary history of the butterfly subfamily Satyrinae (Lepidoptera: Nymphalidae)

    Author : Carlos Peña; Niklas Wahlberg; Roderic Page; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; hostplant use; habitat shift; diversity; grasses; biogeography; phylogeny; Molecular biology; Molekylärbiologi; zoologisk ekologi; Animal Ecology;

    Abstract : I present an overview of the evolutionary history of Satyrinae butterflies (Lepidoptera: Nymphalidae). By using Bayesian and cladistic methods, I develop a phylogenetic hypothesis as a basis for studying the evolutionary history of the group. READ MORE