Differences in perch diet composition between the three study periods. N = number of perch with a specific food component; ΣW = total weight of specific food component; Pr(>|z|) = level of significance (generalised linear model), * = p < 0.05, *** = p < 0.001; na = not applicable. Native fish were cyprinids (1981/1982 and 2011/2012) and cyprinids + juvenile perch (1998).
|Food item||1981/1982||1981/1982 vs. 1998||1998||1981/1982 vs. 2011/2012||2011/2012||1998 vs. 2011/2012|
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