Search for dissertations about: "countergradient variation"
Found 3 swedish dissertations containing the words countergradient variation.
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1. Local Adaptation, Countergradient Variation and Ecological Genetics of Life-history Traits in Rana Temporaria
Abstract : The main aim of this work was to identify local adaptation processes in amphibian populations, thereby improving the general understanding of genetics and mechanisms behind the evolution and maintenance of biological diversity. Phenotypic and genetic variation in life-history traits was studied within and between populations common frog (Rana temporaria) populations along a 1600 km transect from southern Sweden to northern Finland. READ MORE
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2. Population Differentiation in Solidago virgaurea along Altitudinal Gradients
Abstract : Altitudinal gradients offer attractive opportunities for studies of population differentiation in response to environmental heterogeneity. In this thesis, I examined population differentiation along altitudinal gradients by combining common-garden experiments with field studies and experiments in alpine, subalpine and boreal populations of the perennial herb Solidago virgaurea. READ MORE
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3. Adjusting to the extreme : Thermal adaptation in a freshwater gastropod
Abstract : Temperature is a ubiquitous force influencing biological processes ranging from cellular responses to life span. The thermal environment for many organisms is predicted to change with globally increasing temperatures and studies conducted in natural systems incorporating various evolutionary forces, such as gene flow, is needed. READ MORE