Erosion into carbonate rock facilitates dispersal-mediated allopatric speciation in freshwater fishes

We explore the diversification of the Vermilion Darter complexthat includes the federally endangered Vermilion Darter (Etheostoma chermocki) and Warrior Darter (E. bellator). Unique lineages of this species complex are restricted to tributaries flowing over carbonate rocks in the Black Warrior River. River incision is progressively exposing more carbonate rock, driving dispersal mediated allopatric speciation within the Vermilion Darter complex.