Fig. 4

Relationship between mean desiccation resistance (circles) or pigmentation (diamonds) in each population and PC1 (top panel) or PC2 (bottom panel). The left-side y-axis corresponds to desiccation resistance in minutes survived, while the right-side y-axis show pigmentation values on that correspond to a greyscale value represented by the gradient bar. PC1 is not significantly associated with desiccation resistance (r(7) = 0.15; P = 0.71) or pigmentation (r(7) = 0.53; P = 0.15) was across all 9 populations (top, grey trend lines). PC2 is associated with both desiccation resistance (r(7) = 0.74; P = 0.022) and pigmentation (r(7) = 0.68; P = 0.044) (bottom, black trend lines), prior to multiple testing correction