Figure 5: Caribbean pupfish populations and SSI radiating populations have the highest estimates of similarity, while SSI generalist-only populations have the lowest estimates of similarity.Results of matrix comparisons using the PCA similarity method. The squares along the longest diagonal show the mean values of P matrix metrics for the corresponding comparisons. The remaining squares show the differences between two comparisons. Fill colors represent low (light purple) and high (dark purple) values within each metric. Asterisks indicate that metrics are significantly different between groups (Appendix Table C1).