Fig. 2.

(A) PCA of allele frequency data from all loci. Codes are as follows: DEM, putative demersal locations; NS, North Sea samples; PEL, putative pelagic locations within the Baltic; TZ, transition zone between the Baltic Sea and the North Sea (Barsebäck samples). (B) Relationship between geographic and genetic distance among sampling locations. “Within” refers to pairwise comparisons among locations belonging to the three major genetic clusters identified by PCA, fastSTRUCTURE, and K-means clustering. (C) Individual ancestries from fastSTRUCTURE analysis (K = 3).