Search for dissertations about: "speciation"
Showing result 6 - 10 of 281 swedish dissertations containing the word speciation.
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6. Sex, Sperm and Speciation : On sexual selection and fertility in hybridizing flycatchers
Abstract : Sexual reproduction entails complex co-evolution between the sexes, necessary for successful fertilization, ensuring individual and population-level fitness. Interfertility is the main criterion for species definition and understanding speciation requires detailed studies of reproductive barriers. READ MORE
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7. Mechanisms of speciation in Silene
Abstract : A fundamental question in the field of evolutionary biology is how new species originate. Investigating speciation benefits from an integrated approach, which requires a solid understanding of ecology, reproductive biology, geographical distribution, underlying genetic architecture of reproductive isolation (RI), demographic history and genomic divergence. READ MORE
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8. Speciation genetics of recently diverged species
Abstract : Species differentiation can be a consequence of evolutionary forces including natural selection and random genetic drift. Patterns of genomic differentiation vary across the tree of life. This variation seems to be dependent on, for example, differences in genomic architecture and molecular mechanisms. READ MORE
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9. Bottlenecks and blowflies : Speciation, reproduction and morphological variation in Lucilia
Abstract : This thesis attempts to improve our understanding of the role of population size for the process of speciation. First, the effect of population size on speciation is studied using several meta-analyses of published laboratory experiments. READ MORE
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10. Metal Speciation and Toxicity in Sewage Sludge
Abstract : Increasingly stringent controls on metal concentrations in sewage sludge destined for agricultural application provided a basis for the study of the relevance of metal speciation in sewage sludge. A comprehensive literature review identified difficulties in relating metal speciation through single chemical extractions to plant uptake and soil toxicity. READ MORE