In our recently published study in Molecular Ecology, Emanuel A. Fronhofer, Florian Altermatt, and me analyzed empirically observed genetic diversity of Gammarus fossarum metapopulations across the Rhine drainage area within Switzerland. We used microsatellite data and stochastic simulations to study the role of dispersal behaviour on observed genetic diversity. Allelic richness and observed heterozygosity were higher in more central nodes, unlike expected heterozygosity. Stochastic simulations suggest upstream movement probability and dispersal rate to be key factors explaining this finding. The study is open access. A huge thank you to Anja Westram and Jukka Jokela for support early on during analysis and providing data.