Abstract
Biodiversity may be measured at many different scales from the number of species and individuals to the distribution of genotypes in individuals and populations. Understanding how genotypes are distributed within populations, and how genotypic variabilityaffects individual and population fitness, is necessary in order to predict the effect of environmental change or human encroachments. Mechanisms of evolutionary change include selection, gene flow, and detailed information on the relative importance of these mechanisms and how they interact in a natural setting is necessary in order to predict what changes may occur and what the consequences are. We will study spatial and temporal variation in the genotypes of brown trout, by sampling and genotyping all individuals in one stream over 3 years. We can then quantify the variability in individual reproductive success, relatedness among individuals, fine-scale genetic structure, and estimate effective population size. Then, we can study in detail how genetic variation is lost (genetic drift), and quantify a number of micro evolutionary processes.
Norway