Evolution in heterogeneous populations: from migration models to fixation probabilities.

摘要: Although dispersal is recognized as a key issue in several fields of population biology (such behavioral ecology, genetics, metapopulation dynamics or evolutionary modeling), these disciplines focus on different aspects the concept and often make implicit assumptions regarding migration models. Using simulations, we investigate how such translate into effective gene flow fixation probability selected alleles. Assumptions type (e.g. source-sink, resident pre-emption, balanced dispersal) patterns stepping-stone versus island have large impacts when demes differ sizes selective pressures. The effects fragmentation, well spatial localization newly arising mutations, also strongly depend patterns. Migration rate matters: depending type, probabilities at an intermediate may lie outside range defined by low- high-migration limits sizes. Given extreme sensitivity to characteristics dispersal, underline importance making explicit (and documenting empirically) crucial ecological/ underlying