Genetic divergence
There was no structure across the principal coordinates (Figure 3); in fact all four of them explained a similar percentage of variation (Figure 3, inset), indicating near-orthogonality (i.e. independence) of the original axes of variation. Yet, there were two notable outliers shared between datasets reflecting adaptation to high-CO2 environments (red identified points on Figure 3). Only one of these genes was annotated, as.