Correlates of genetic diversity and differentiation with species’ characteristics
Genomic diversity across individuals has a strong positive relationship with the harmonic mean of effective population size estimated from each individual (Fig. 3A; R2 = 0.689). This association remained when we took evolutionary history into account with phylogenetic independent contrasts (Fig. 3C; R2 = 0.599). We may expect these patterns a priori because genomic diversity and population sizes should be directly linked. In contrast, we found no relationship between genomic diversity and HWI measurements across individuals (Fig. 3B, Fig. 3D).
Genomic differentiation (as measured by FST) showed a significant negative association with dispersal ability (measured by HWI) (Fig. 5A). This relationship remained when accounting for evolutionary history with PICs (Fig. 5C). Genomic differentiation showed a negative non-significant negative association with harmonic mean of effective population size (Fig. 5B, Fig. 5D).