Search for dissertations about: "collared lemming"

Found 4 swedish dissertations containing the words collared lemming.

2. 1. Investigating the impacts of Late Pleistocene climate change on Arctic mammals using palaeogenomics

   Author : Edana Lord; Love Dalén; Mirte Bosse; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; palaeogenomics; Arctic; Late Pleistocene; past climate; collared lemming; woolly rhinoceros; Norwegian lemming; muskox; demography; population structure; speciation; adaptation; genome erosion; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Abstract : The climatic fluctuations of the Late Pleistocene likely had a large impact on the evolutionary history of Arctic species. Palaeogenomics is a useful tool to shed light on how past populations responded to these climatic shifts and the associated ice sheet dynamics and sea level change. READ MORE

4. 2. Genetic structure, demographic change and extinction dynamics in the collared lemming and woolly mammoth

   Author : Eleftheria Palkopoulou; Love Dalén; Richard Edward Green; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Abstract : In light of current climate change it is critical to understand how different species have been affected in the past by well-known climatic events. In this thesis, DNA was retrieved from ancient material to study the population dynamics of two cold-adapted taxa that capture the extremes of body size range in mammals: the collared lemming (Dicrostonyx sp. READ MORE

5. 3. Phylogeography and mitochondrial DNA diversity in arctic lemmings

   Author : Vadim B. Fedorov; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; Genetik; Clinical genetics; Klinisk genetik; Genetics; genetik;

   Abstract : The aim of this thesis is to evaluate the effects of Quaternary environmental fluctuations on the present patterns of mitochondrial DNA variation in the wood lemming, Myopus schisticolor, and the two genera of Arctic lemmings: collared lemmings, Dicrostonyx, and true lemmings, Lemmus.The phylogeographic pattern and the limited mtDNA diversity in the Scandinavian populations of the wood lemming reflect recent colonization by a limited number of founders during the Holocene boreal forest expansion. READ MORE

6. 4. Population fluctuations and life history consequences in the arctic fox

   Author : Magnus Tannerfeldt; David Macdonald; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; zoologisk ekologi; Animal Ecology;

   Abstract : In this thesis, I describe and explain drastic population fluctuations in the arctic fox Alopex lagopus (L.). I proceed to examine evolutionary consequences of unpredictable fluctuations in terms of life history strategies. In fluctuating populations, the risks and benefits of different behaviours vary with changes in population density. READ MORE