Figures:
Figure 1: Size-corrected Δ13C and
Δ15N of muscle and liver tissue (i.e. residuals of
regressions of TDFs on fish length) of different weight classes in
perch. Weight classes with the same letter are not significantly
different (Tukey´s pairwise comparisons). Boxplots depict median, 25th
and 75th percentile, and whiskers extend to maximum and minimum values,
except for outliers (>1.5 times box height, represented by
dots).