Abstract
Our goal is to integrate studies of adaptive genetic variation in natural populations with ecological field experiments, using damselflies (Zygoptera) as model organisms. We will combine molecular genetic methods (Amplified Fragment Length Polymorphism, AFLP) with studies of quantitative traits of ecological importance. We will relate molecular divergence to divergence in phenotypic traits to get a better understanding of population divergence at both the molecular and phenotypic levels. We will also perform direct tests of local adaptation using reciprocal transplant experiments, in which fitness and performance of local and immigrant phenotypes are measured. The degree of sexual isolation between pairs of populations at varying ecological and genetic distances will be quantified to evaluate the relative role of genetic drift versus locally varying selection pressures in shaping population divergence. Strong preference for local mates will preserve adaptive genetic combinations and hence strengthen local adaptation. The extent of sexual isolation between conspecific populations is important, since gene flow is generally thought to erode local adaptation and may under some circumstances lead to population extinction. Genetic variability in adaptive traits, the degree of local adaptation and sexual isolation are crucial factors influencing population viability and have thus important implications for conservation biology.
Sweden