Sökning: "Dispersal barriers"
Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Dispersal barriers.
1. Physical and biological dispersal barriers in invasive, bloom-forming microalgae
Sammanfattning : For a long time microorganisms were assumed to have unlimited dispersal due to their small size and high cell numbers. Most microbial species can be transported by water currents, in water droplets by wind and attached to other organisms. LÄS MER
2. Population divergence at small spatial scales : – theoretical and empirical investigations in perch
Sammanfattning : Genetically structured populations arise when gene flow between groups of individuals is hindered by geographical, behavioural or temporal barriers. The identification of such groups is important for understanding evolution and has large implications for conservation concern. LÄS MER
3. Genetic variation and gene flow in riparian populations of Filipendula ulmaria
Sammanfattning : .... LÄS MER
4. Species distribution models : ecological applications for management of biodiversity
Sammanfattning : Species distribution models are a group of methods often used to estimate consequences of global change, to assess ecological status and for other ecological applications. The main idea behind species distribution models is that the geographical distributions of species can, to a large part, be explained by environmental factors and that species distributions therefore can be predicted in time or space. LÄS MER
5. The big picture from small landscapes : investigations of spatial patterns and processes using a model metacommunity
Sammanfattning : Habitat fragmentation is a major current threat to natural environments. Still, fundamental questions of what influences ecological communities in spatially structured habitats are unanswered. In this thesis, microarthropods in moss patches were used in a model system, where both biotic and abiotic factors could be manipulated. LÄS MER
