Fig. 4.

Associations between genome-wide marine - freshwater F_ST and environmental, phenotypic and genetic distance across all pairwise comparisons of 73 freshwater populations: a) Proportion of MxF F_ST 50kb outlier windows that overlap among freshwater replicates. Freshwater populations are ordered as Alaska, British Columbia, Iceland and Scotland, with these location distinguishable as four clear clusters; b) Environmental distances between freshwater populations, recorded as Euclidean distances in PCA space for all 7 environmental variables; c) Phenotypic (Euclidean) distances between freshwater populations for the 12 phenotypic variables; d) Genetic distances between freshwater populations, recorded as genome-wide pairwise F_ST based on 8,395 unlinked SNPs; e-g) Associations between environmental (e), phenotypic (f) and genetic (g) distances and MxF F_ST overlap (log-transformed). Points are coloured according to whether pairwise comparison is being made within a radiation or across radiations.