highly significantP < 0.0001
When compared to the PCAs ( S1 and S2 Figs) computed separately on the same data, the major shape and genetic PLS axes appear nearly identical to the corresponding first principal components (microsatellite PC1 = 23.35%, shape PC1 = 22.22%), with pairwise correlations displaying values greater than 0.98 and highly significant ( P < 0.0001).