Fig. 4
From: Trophic niche partitioning of littoral fish species from the rocky intertidal of Helgoland, Germany
Biplot of the principal component analysis based on the correlation matrix of the combined trophic markers, i.e. three fatty acid (FA) ratios as well as carbon stable isotope (δ 13C) and nitrogen stable isotope (δ 15N). 63.4 % of the total variability is explained on the first two axes. Mean PC1 and PC2 scores are visualized for each year and each of the five fish species (Ctenolabrus rupestris, Pomatoschistus minutus, Pomatoschistus pictus, Myoxocephalus scorpius, Taurulus bubalis). Dotted lines indicate the time trajectory from 2009 to 2011