Search for dissertations about: "ecotype"
Showing result 1 - 5 of 15 swedish dissertations containing the word ecotype.
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1. Black Truffles of Sweden : Systematics, Population Studies, Ecology and Cultivation of Tuber aestivum syn. T. uncinatum
Abstract : Tuber aestivum is an ectomycorrhizal ascomycete with underground fruit bodies. It is an economically important species, but has been regarded as endangered in Sweden. My inventory has increased the number of reported localities from 3 to 31. It has long been debated whether T. READ MORE
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2. Intraspecific variation in Rhinanthus angustifolius. Local adaptation, phenotypic plasticity and geographical structure
Abstract : Plant species often adapt to local environmental conditions, which can result in the formation of genetically and phenotypically distinct ecotypes. Ecotypes can evolve rapidly, and may be a first step in the process of ecological speciation. READ MORE
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3. Pollinator-mediated selection and the evolution of floral traits in orchids
Abstract : In this thesis, I combined manipulations of traits and pollination environment with analysis of phenotypic selection to examine causes of variation in strength and mode of selection on floral traits, and I conducted a reciprocal sowing experiment to test for local adaptation in germination success. I tested the following predictions (1) the opportunity for selection, and the strength of pollinator-mediated and net selection increase with increasing pollen limitation, (2) the effects of traits affecting pollinator attraction and traits affecting pollination efficiency are non-additive and this leads to pollinator-mediated correlational selection, (3) the effects of spur length on pollen removal, pollen receipt, and female fitness differ between populations with short-tongued and populations with long-tongued pollinators, and (4) local adaptation at the stage of germination contributes to the maintenance of ecotypes growing in grasslands and woodlands, respectively. READ MORE
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4. Physiological adaptations in two ecotypes of Fucus vesiculosus and in Fucus radicans with focus on salinity
Abstract : The in origin intertidal marine brown alga Fucus vesiculosus L. grow permanently sublittoral in the brackish Bothnian Sea, side by side with the recently discovered F. radicans L. Bergström et L. READ MORE
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5. Genomic divergence in differentially adapted wild and domesticated barley
Abstract : Genomic divergence is responsible for plant differential adaptation to diverse and contrasting environments and different biotic stresses. This thesis focuses on the analyses of the adaptive genomic divergence in wild and domesticated barley and the driving evolutionary forces, and to identify genes and genetic variation with signature of adaptive selection. READ MORE
