Scale-dependent genetic structure of the Idaho giant salamander (Dicamptodon aterrimus) in stream networks

摘要: The network architecture of streams and rivers constrains evolutionary, demographic ecological processes freshwater organisms. This consistent also makes stream networks useful for testing general models population genetic structure the scaling gene flow. We examined flow in facultatively paedomorphic Idaho giant salamander, Dicamptodon aterrimus, Montana, USA. used microsatellite data to test by (i) examining hierarchical partitioning variation networks; (ii) isolation distance along corridors vs. overland pathways. Replicated sampling within catchments three river basins revealed that scale had strong effects on amova identified significant at all scales (among streams, among catchments, basins), but divergence greatest structural influence. Isolation was detected in-stream a predictor divergence. Patterns suggest differentiation driven limited migration, with hierarchy model structure. However, there no evidence migration basins, or indicating only counters drift smaller (within rather than catchments). These results show influence contrasting different scales.