Fig. 1. Sampling location and population structure of coastal and pelagic common bottlenose dolphins.

(A) Map of sample locations of the common bottlenose dolphin ecotypes, in the eastern North Atlantic (ENA), western North Atlantic (WNA), and eastern North Pacific (ENP). (B) Ancestry proportions for each of the 57 individuals inferred in NGSAdmix (39) for a number of clusters, K = 4, identified as the highest level of structure using the Evanno method (75). (C) PCA showing the first and second PCs. The proportion of genetic variance captured by each component is indicated between parentheses.