Fig. 5

The relationship of the mean trait variation [ln CV] of one resource across all traits plotted against the C/N ratio. The grey curve denotes a quadratic regression (linear effect – C/N, estimate: − 0.38 ± 0.12, t = − 3.2, p = 0.015; nonlinear effect – C/N x C/N, estimate: 0.02 ± 0.01, t = 2.9, p = 0.022). Circles represent means, colors correspond to Fig. 1