Figure 4: Principal Coordinate Analysis (PCoA) of Symphodus tinca locations of the Adriatic Sea using FST pairwise genetic distances.

(a) using the 4,155 polymorphic SNPs, (b) using the 19 outlier SNPs under local adaptation and (c) using the 3,934 neutral SNPs. The percentage of variability explained by each coordinate is shown in brackets. Dashed lines encircle the non-significantly differentiated locations after FDR correction as in Table 2 and Table S1. Dotted line encircle locations non-significantly differentiated but with p-values close to significance as in and Table S1. KAP: Karaburun Peninsula, Albania; VIR: Island of Vir, Croatia; TRE: Tremiti Islands, Italy; TOG: Torre Guaceto, Italy; OTR: Otranto, Italy and POC: Porto Cesareo, Italy.