Fig. 4

Results of PCA ordination of allele frequencies, performed with the smartPCA algorithm. The distinction between the offshore site (OS, outlined in black) and the remaining samples in the study appears to drive the variation observed across the first PC. While there is significant overlap between all the remaining sites, three individuals from the outermost Skjálfandi bay site (S5) and one from the innermost site (S1) appear to cluster closer to the OS samples