Figure 1.

Divergence of genetic architecture across the Anolis radiation. Numbers on the diagonal represent size (total genetic variance × 10³), shape (percent variance explained by g_max), and orientation (vector angle between g_max and the major axis of divergence, d₁). Numbers off the diagonal represent the angle in degrees between g_max vectors for a species pair. All estimates of g_max were significantly more aligned than expected by chance (see Methods; ^* P < 0.05, ^** P < 0.01, ^*** P < 0.001). All estimates of g_max were also aligned with both d₁ and h₁, the axis of greatest shared genetic variance (Table S4). Statistics for a reconstruction of the ancestral G using maximum likelihood are presented at the root of the phylogeny (Zheng and Wiens 2016), which has an estimated date of 41.5–43.5 million years ago (Zheng and Wiens 2016; Poe et al. 2017). The most recent splits in the phylogeny occurred approximately 19.8–22.5 million years ago (Zheng and Wiens 2016; Poe et al. 2017). The island of origin for each group is indicated on the phylogeny (from top to bottom, Puerto Rico, Jamaica, and Cuba).