FIGURE 5.

Principal component analysis (PCA) with δ¹³C_EAA values centered to the EAA mean of herring (a) and sprat (b), respectively. The convex hulls represent the maximum range in PC1 and PC2 scores for each of the four sampling locations. The most important EAAs for variations among locations are displayed in two first ordination components. Values in parentheses are the percentage variations accounted by each axis. In (a and b), the first two axes account for 95% and 92% of the variations, respectively. For a PCA with both species, see Figure S1. Amino acid abbreviations: isoleucine (Ile), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine (Phe), threonine (Thr), tyrosine (Tyr) and valine (Val)