Multiple linear regression models testing the effect of environmental parameters and contaminants on biotic response variables: the total number of individuals and taxa, Simpson and Shannon diversity, number of EPT taxa and the saprobic index.

Given are df-, R2-, F- and p-values for full models after stepwise deletion of non-significant terms (n.s.) and of significant model parameters.
★, p<0.05;
★★, p<0.01;
★★★, p<0.001; n.a., not available.