Figure 2. Population structure analysis of 11,457 neutral and
143 outlier SNPs for the intertidal gastropod Steromphala
umbilicalis in the UK and Ireland. (A) Heatmap based on pairwise
FST values across sampling sites (neutral SNPs = below
diagonal; outlier SNPs = above diagonal). Non-significant pairwise
comparisons are indicated with a black dot (P>0.001). The
distribution of population structure for K=4 adaptive genetic clusters
(outlier SNPs) is shown using TESS3 (B) and DAPC (C). Online version in
colour.