Sökning: "population structure"
Visar resultat 21 - 25 av 730 avhandlingar innehållade orden population structure.
21. Single-cell population genetics and dispersal limitation of a bloom-forming microalga
Sammanfattning : Microalgal range expansions are increasing in frequency and magnitude worldwide mostly due to anthropogenic factors. However, they often remain unnoticed until mass development (algal blooms) occurs due to difficulties in detection when population densities are low. LÄS MER
22. Population Genetic Structure of Black Grouse (Tetrao tetrix) : From a Large to a Fine Scale Perspective
Sammanfattning : Black grouse (Tetrao tetrix) is a bird species with a lek mating system found in the Palearctic boreal taiga. It is assumed that it has a continuous distribution along Scandinavia and Siberia, whereas in Central Europe it has declined during the last decades. LÄS MER
23. Population biology and conservation of beetles and pseudoscorpions associated with hollow oaks
Sammanfattning : Many species associated with old trees are threatened, as this habitat has decreased severely in Europe during the last 200 years. In old oaks, hollows with wood mould often form in the trunks and these harbour a specialized fauna mainly consisting of beetles, flies and pseudoscorpions. LÄS MER
24. Genetic Disequilibria and the Interpretation of Population Genetic Structure in Daphnia
Sammanfattning : Understanding the processes that shape the spatial distribution of genetic variation within species is central to the evolutionary study of diversification and demography. Neutral genetic variation reflects past demographic events as well as current demographic characteristics of populations, and the correct interpretation of genetic data requires that the relative impact of these forces can be identified. LÄS MER
25. Plant ecological studies related to restoration of a degraded ecosystem in central Tanzania
Sammanfattning : Kondoa Irangi area is among the most degraded ecosystems in Central Tanzania as a result of heavygrazing, fire, collection of fuelwood and improper cultivation practices. The restoration process of thisdegraded ecosystem through natural regeneration is slowed by the semi-arid climate of the area combinedwith poor soil nutrient status. LÄS MER