Principal Component Analysis (PCA) biplot based on fatty acid profiles of (A) muscle reserve (in % of NL) and (B) gonad reserve (in % of NL). Each dot represents an individual, positioned according to its coordinates on the first two principal components. Shapes display the sampling month (circle = January; square = March), point sizes display the sex (large points: females; small points = males) and colors display the species (Sardinella aurita in blue, Sardinella maderensis in yellow). Arrows represent the fatty acids, with their orientation and length indicating their direction and strength of contribution to each dimension.