Figure 1. A) Sampling sites across the species distribution (blue, adapted from FAO). The color of each circle represents the most frequent genetic cluster for K=3 (Figure 2A). Surface currents are represented by arrows: Azores current (AzC); Canary Current (CaC); Portugal Current (PoC); Navidad Current (NaC). The Almeria-Oran Front (AO) is shown as a dashed line. B) Population structure plot showing the ancestry of each individual (vertical bar) to two (above) and three (below) genetic clusters. C) Distribution of individuals based on the first three components of the principal component analysis. Variance explained by each component is shown in parenthesis. D) Population net (PopART, median-joining network) obtained using mitochondrial variants with minor allele frequency above 30%; mutations shown as Hatch marks. Colors represent the main ancestry of each individual (for K=3 as in Figure 1B) except for samples from the Canary Islands which are depicted in green.