Figure 5. Biplots showing results of RDA analyses on the best model for neutral (left, N= 3,820) and outlier (right, N= 24) SNP datasets of the intertidal marine gastropod Nucella lapillus . Coloured points on the biplots correspond to sampling sites indicated on the inset map. Arrows represent predictor variables that significantly explain population genetic structure for each dataset. Online version in colour.