Sökning: "distance to species pool"
Hittade 4 avhandlingar innehållade orden distance to species pool.
1. Grassland restoration : Connectivity, plant community change and cows
Sammanfattning : The ecological significance of semi-natural grasslands is high because these habitats provide a home for a diverse flora and fauna and support a range of associated ecosystem services. Due to large-scale land-use changes the extent of grassland habitat has declined. LÄS MER
2. Fishing the gene pool : Genetic structure, admixture and behavioural complexity in fisheries management
Sammanfattning : Prudent management of marine fish resources relies on separation and management of biologically meaningful groups of conspecifics, termed fishery stocks, often depicted as self-sustaining, spatiotemporally separated and demographically independent entities. Such stock discrimination has however proven challenging. LÄS MER
3. Geographic Distribution of Intra-specific Variation in Widespread Eurasian boreo-nemoral Woodland Herbs
Sammanfattning : Many woodland plant species have huge distribution areas covering large parts of the Eurasian continent including areas that were glaciated during the last glacial period. In the present thesis, the geographic distribution of variation within such species is investigated and discussed in relation to glacial survival and post-glacial migration, dispersal ability, breeding system and levels of gene-flow between populations and related species, and various methods to measure and analyse genetic variation. LÄS MER
4. 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
