Sökning: "Eurasia"

Visar resultat 1 - 5 av 32 avhandlingar innehållade ordet Eurasia.

  1. 1. Lake-level records and palaeoclimates of northern Eurasia

    Detta är en avhandling från Department of Quaternary Geology, Lund University

    Författare :Ge Yu; [1996]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; late Quaternary; Holocene; palaeo-hydrology -climatology; lake status; Eurasia; Geology; physical geography; Geologi; fysisk geografi;

    Sammanfattning : This thesis documented lake-level changes across Eurasia and made reconstructions of regional climates and atmospheric circulation patterns during the late Quaternary; analysed temporal signals in lake record; used lake data to improve pollen-based quantitative recostructions of climate; and compared lake data with simulated P-E fields from Atmospheric General Circulation (AGC) models. Lake records from northern Eurasia showed regionally-coherent patterns during the late Quaternary, in response to changes in insolation and glaciation (Papers I and II appended in the thesis). LÄS MER

  2. 2. Divergence, selection, demographic history and conservation genomics of sibling bird species in boreal forest in Northern Eurasia and the Qinghai-Tibetan Plateau

    Detta är en avhandling från Uppsala : Uppsala University

    Författare :Kai Song; Jacob Höglund; Yue Hua Sun; Peter Halvarsson; Juha Merilä; [2020]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Sichuan Jay; Siberian Jay; Chinese Grouse; Hazel Grouse; genomics; demographic history; ROH; genetic load;

    Sammanfattning : I used two pairs of sibling boreal forest bird species to study divergence, selection, demographics, and conservation in northern Eurasia and the Qinghai-Tibetan Plateau at the microsatellite level (chapter 1) and whole genome level (chapters 2, 3, 4 and 5). In chapter 1, which is the first study to describe genetic diversity of the Sichuan Jay, I used microsatellite markers to estimate genetic differentiation in Sichuan Jay and Siberian Jay populations. LÄS MER

  3. 3. On the Late Saalian glaciation A climate modeling study

    Detta är en avhandling från Stockholm : Department of Geology and Geochemistry, Stockholm University

    Författare :Florence Colleoni; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Climate modeling; Eurasian ice sheet; Quaternary; Saalian; surface mass balance; SST; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; Marine Geoscience; marin geovetenskap;

    Sammanfattning : This thesis focuses on the glaciation of the Late Saalian period (160 -140 ka) over Eurasia. The Quaternary Environment of the Eurasian North (QUEEN) project determined that during this period, the Eurasian ice sheet was substantially larger than during the entire Weichselian cycle and especially that of the Last Glacial Maximum (21 ka, LGM). LÄS MER

  4. 4. Conservation Genetics of the White-Tailed Eagle

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Frank Hailer; Uppsala universitet.; [2006]
    Nyckelord :Biology; Haliaeetus albicilla; microsatellites; mtDNA; molecular sexing; population structure; bottleneck; phylogeography; raptors; Biologi;

    Sammanfattning : The white-tailed eagle is a formerly threatened raptor that is commonly used as a flagship and indicator species in conservation work. This thesis uses molecular genetic methods to study sex determination of nestlings, genetic variability, population structure and phylogeography of the white-tailed eagle. LÄS MER

  5. 5. Phylogeographic Structure and Genetic Variation in Formica Ants

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anna Goropashnaya; Uppsala universitet.; [2003]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; Formica ants; phylogeography; phylogeny; Pleistocene refugia; population expansion; social organization; Genetik; MEDICINE Dermatology and venerology; clinical genetics; internal medicine Clinical genetics; MEDICIN Dermatologi och venerologi; klinisk genetik; invärtesmedicin Klinisk genetik;

    Sammanfattning : The aim of this thesis is to study phylogeny, species-wide phylogeography and genetic diversity in Formica ants across Eurasia in connection with the history of biotic responses to Quaternary environmental changes.The mitochondrial DNA phylogeny of Palaearctic Formica species supported the subgeneric grouping based on morphological similarity. LÄS MER