Fig. 3.

Frequencies of outlier loci in each sampling location. SNPs are identified by the locus number (above) and the SNP position within the locus in base pairs (below). The first eight loci are outliers between pelagic and demersal flounders, and the last three are outliers between North Sea and Baltic pelagic locations. Individuals in Irbe were grouped separately in pelagic (above) and demersal (below) groups based on PCA, fastSTRUCTURE, and K-mean clustering results. Blue alleles are characteristic of pelagic Baltic populations; red alleles are characteristic of demersal Baltic populations. Black alleles are characteristic of North Sea populations.