Figure 3.

Average island seed size to mainland seed size (mm²) ratio by (a) dispersal mode and (b) growth form. The dashed horizontal line represents equal island and mainland seed size (ratio = 1; ratio > 1 indicates larger seeds on islands, ratio < 1 indicates larger mainland seeds). Error bars are standard error. Letters indicate whether average island to mainland seed size ratios are different between dispersal modes and growth forms (Kruskal–Wallis test: (a) χ² = 5.61, d.f. = 1, p = 0.018; (b) χ² = 2.28, d.f. = 2, p = 0.321).