Figure 1.

Phenotype–environment correlations. Species means of trait values (see ‘Material and methods’ for details) were plotted against species means of δ₁₃C and δ₁₅N. δ₁₃C is considered to be an indicator of macrohabitat use, with higher or lower values reflecting a benthic or limnetic carbon source, respectively. δ₁₅N is a proxy for trophic level, with larger values reflecting a higher trophic position.