Sökning: "postglacial recolonisation"

Hittade 4 avhandlingar innehållade orden postglacial recolonisation.

1. 1. Postglacial Population History of the Common Shrew (Sorex araneus) in Fennoscandia : Molekylära studier av återkolonisation, könsbundet genflöde och kromosomrasbildning

   Författare :Anna-Carin Andersson; Håkan Tegelström; Cecilia Alström-Rapaport; Jeremy B Searle; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular genetics; Sorex araneus; chromosome race; postglacial recolonisation; hybrid zone; sex-biased gene flow; chromosomal evolution; Genetik; Genetics; Genetik;

   Sammanfattning : The common shrew, Sorex araneus, has one of the most variable karyotypes among mammals, displaying numerous chromosomes races throughout its distribution, which can be categorized into different karyotypic groups. The objective of this thesis was to examine the postglacial population history of Fennoscandian common shrews using autosomal microsatellites, mitochondrial DNA (mtDNA) and a Y chromosome specific microsatellite (L8Y). LÄS MER

3. 2. Genetic variation and inference of demographic histories in non-model species

   Författare :Jean-Luc Tison; Dalén Love; Mats Grahn; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; molekylärgenetik; Molecular Genetics;

   Sammanfattning : Both long-term environmental changes such as those driven by the glacial cycles and more recent anthropogenic impacts have had major effects on the past demography in wild organisms. Within species, these changes are reflected in the amount and distribution of neutral genetic variation. LÄS MER

4. 3. Palaeoenvironmental reconstructions from modern and ancient plant DNA

   Författare :Kevin Nota; Laura Parducci; Love Dalén; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular palaeoecology; Ancient lake sediments; Post-glacial migration; Floral changes; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

   Sammanfattning : Palaeoecological studies on lake sediments and peat archives have provided fundamental knowledge about past environments, nevertheless, a lot remains to be learned. In this thesis, I focussed on plant ancient DNA extracted from sedimentary archives (sedaDNA), in combination with DNA from living trees with the aims of: (1) investigating different extraction methods and levels of inhibition in sediments, (2) investigating postglacial recolonisation history of Norway spruce in Fennoscandia, (3) comparing different sequencing and bioinformatic approaches to investigate past flora changes using sedaDNA and investigating past flora change in contrasting environments (southern Italy versus southern Sweden), and (4) communicating my work more broadly using art. LÄS MER

5. 4. Hybridisation between introduced brown hares and native mountain hares in Sweden

   Författare :Carl-Gustaf Thulin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; naturvårdsbiologi; Conservation Biology;

   Sammanfattning : To investigate the extent and effect of hybridisation between wild sympatric populations of introduced brown hares (Lepus europaeus) and native mountain hares (L.timidus) in Sweden, the geographic distribution of genetic variation in mitochondrial DNA (mtDNA) and nuclear DNA microsatellite markers were analysed within and between the two species and their presumed hybrids. LÄS MER