Figure 4From: Ecological and genetic divergence between two lineages of Middle American tĂșngara frogs Physalaemus (= Engystomops) pustulosusIsolation by distance. Genetic distance (RST values) versus geographic distance (in km) as population pairwise comparisons in Middle American tĂșngara frogs. Grey squares represent distances between one population from the North and one population from the South; White triangles represent distances between two populations from the North, and black diamonds represent distances between two populations from the South.Back to article page