Fig. 4.

Lack of niche differentiation on genus-wide level. Across all Boechera species, there is no evidence of an association between niche differentiation and reproductive-mode divergence (A and C), but significant evidence between diploids and triploids (B and D). Strong differentiation between tetraploidy and all other ploidy levels is observed although this result is based on only six observations. The Upper panels show Maxent predictive ecological models of Boechera accessions. Habitat suitability is represented using different colors from low (green) to high (red). Strength of distribution differences is displayed for the surplus of apomicts or polyploids (shades of green) and the surplus of sexuals or diploids (shades of red). The Lower panels depict constrained discriminant function score distributions, where dashed ellipses represent 50% normal intervals and solid black vectors represent the scaled direction and effect of the labeled explanatory variables.