Fig. 5

PCA biplots with principal components 1 and 2 and following paired SIMCA test results for the concentrations of fatty acids in the whole body of prey fish caught from the Baltic Proper (BPr), Bothnian Sea (BS) and Gulf of Finland (GoF), including a all sprat (S) and herring (H) in autumn and spring, b all sprat and herring in autumn and c all herring (H-BPr, H-BS and H-GoF) in autumn. Each symbol refers to a pool (whole body homogenate), which for sprat consisted of 12–92 specimens and for herring 7–133 specimens