Fig. 2
From: Trophic niche partitioning of littoral fish species from the rocky intertidal of Helgoland, Germany
Principal component analysis plots each based on the correlation matrix of 20 ln(x + 1)-transformed fatty acids (FA) measured of the fish species Ctenolabrus rupestris, Pomatoschistus minutus, Pomatoschistus pictus, Myoxocephalus scorpius and Taurulus bubalis collected from 2009 to 2011. The first two axes explain 69.1 % of the total variability. a Samples are marked according to their sampling year; b samples are marked according to species