Figure 7. Biplots showing results of RDA analyses on the best
model for neutral (left, N= 11,457) and outlier (right, N= 143) SNP
datasets of the intertidal marine gastropod Steromphala
umbilicalis . 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.