Table 2. Eigenvector loadings and eigenvalues for PCA of four linear shell measurements of Bouchardia.

Results	Original variable	PC1	PC2
Eigenvector loadings	Pedicle valve length	−0.513*	0.083
	Brachial valve length	−0.511*	−0.013
	Shell height	−0.489*	0.664*
	Shell width	−0.486*	−0.743*
Eigenvalues (%)		92.8	4.8

Loadings denoted with an asterisk (^*) are significantly correlated with the original independent variables (Pearson correlations; P≤0.0010; Bonferroni-corrected α_adj = 0.00625 for 8 tests).