Search for dissertations about: "Diversification"
Showing result 16 - 20 of 246 swedish dissertations containing the word Diversification.
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16. Microbial evolution: patterns of diversity in aquatic protists
Abstract : Little is known about how microbes diversify in nature. In contrast to the more studied multicellular organisms, microbes can have a) huge population sizes, b) high reproductive rates and c) long-distance dispersal. These characteristics can affect their tempo and mode of diversification in ways that still need to be understood. READ MORE
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17. Adaptive evolution in multidimensional trait spaces
Abstract : Negative frequency-dependent disruptive selection, which arises due to the interplay between organisms of a population and their environment, is an important element driving phenotypic diversification and even speciation. Such selection regime can result from frequency- and density-dependent interactions between the organisms and their environment, so that the fitness landscape itself changes as the population evolves. READ MORE
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18. Managing Value Creation and Appropriation
Abstract : This thesis investigates how large Swedish manufacturing companies try to create value and appropriate financial returns by renewing their product offerings through the integration of Information and Communication Technologies (ICTs) in their established product categories, and the related challenges and opportunities this produces.While much attention has been given to the technology dimension of diversification, the economic and commercial domains have been rather ignored in the literature. READ MORE
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19. Evolution of Lycopodiaceae (Lycopsida) : Relationships and Patterns of Diversification
Abstract : A series of phylogenetic analyses using nucleotide sequence data resolves many aspects of the relationships in a group of land plants that until now have received comparatively little attention, the homosporous lycopsids or Lycopodiaceae. Although the group has evolved as an isolated lineage ever since the Late Devonian (more than 470 Myr ago), little is known about how modern species diversity relate to this ancient history. READ MORE
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20. Species Limits, and Evolutionary History of Glassfrogs
Abstract : Recognizing the mechanisms of speciation and the limits of species is essential to understand the origin of biodiversity and how to conserve it. The general aims of my investigations during my doctoral studies were two-fold: to study evolutionary patterns and processes, and to provide specific and superspecific taxonomic classifications that try to reflect evolutionary history. READ MORE