3.4 Contemporary migration and genetic diversity
Through our EEMS analyses we identified several present-day barriers to migration, as well as areas of higher- or lower-than-expected genetic diversity. The Dahomey Gap and the western Congo River were supported as major barriers to dispersal when we simultaneously analyzed all data for both species of Toxicodryas (Fig. 5a). Areas of lower-than-expected diversity were suggested for the coast of Central Africa and higher levels of West African diversity in in the Upper Guinean rainforest (Fig. 5b). We also ran EEMS individually for T. blandingii and T. pulverulenta , but these analyses are more difficult to interpret because of the small sample sizes for each individual species (Fig. S4).