Figure 3.

Correlation of eco-morphological variables and diet. Pair-wise correlations of the eco-morphological variables body height index (BHI), lower pharyngeal jaw (LPJ) weight, δ¹⁵N, and δ¹³C are depicted together with the outcome of linear regression analysis. The solid line indicates the regression line. The 95% confidence interval is indicated by the dotted lines. BHI was positively correlated with LPJ weight and δ¹³C. LPJ weight was negatively correlated with δ¹⁵N and positively correlated with δ¹³C. Limnetic-like individuals (indicated by low BHI and LPJ weight values) tend to feed on a slightly higher trophic level (enriched in δ¹⁵N) than benthic-like individuals (high BHI values). Further, elongated fish with delicate LPJ morphologies are less enriched in δ¹³C, likely indicative of their limnetic life style.