Sökning: "size variation"
Visar resultat 1 - 5 av 629 avhandlingar innehållade orden size variation.
1. Genetic variation in structured populations
Sammanfattning : It is widely acknowledged that the process of speciation in the presence of gene flow between different ecotypes is common in nature. However, the mechanisms underlying speciation are not understood. LÄS MER
2. Seasonal variation and landscape regulation of dissolved organic carbon concentrations and character in Swedish boreal streams
Sammanfattning : The seasonal variation and landscape regulation of dissolved organic carbon (DOC) concentrations in streams have been studied in two watersheds in the boreal zone. The seasonal variation was found to be highly correlated to variations in runoff. An increase in runoff was always accompanied with an increase in DOC concentration. LÄS MER
3. Bottlenecks and blowflies : Speciation, reproduction and morphological variation in Lucilia
Sammanfattning : 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. LÄS MER
4. Why and how brain size evolves : Sociality, predation and allometry
Sammanfattning : The evolution of the vertebrate brain has remained a topic of intense interest from biologists over many decades. Evolutionary biologists have seen it as an intriguing example of how the size and structure of a trait evolves across large phylogenies and under body size constraints, with both large shifts in deep evolutionary time and continuous smaller scale adaptation. LÄS MER
5. Utrymme för variation : - om prövning av socialbidrag
Sammanfattning : The overarching aim of this dissertation is to study divergences in assessments of social assistance in Swedish social welfare offices. ‘Assessments’ here refers to whether applications for social assistance are granted or not, as well as the size of subsidies. LÄS MER