Number of EPT taxa (Ephemeroptera, Plecoptera, Trichoptera) correlating with the first component of the PCA with organic contaminants (OC1).

<p>Displayed are results for sampling campaign in spring (A) and autumn (B). Please note different scaling of y-axes in A and B.</p

Analyzed contaminants.

<p>Analyzed contaminants.</p

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.

<p>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>★<p>, p<0.05;</p>★★<p>, p<0.01;</p>★★★<p>, p<0.001; n.a., not available.</p

NMDS biplot of taxa and environmental variables.

<p>Displayed are variables with a significant impact (p<0.05) for sampling campaign in spring (A) and autumn (B). HM, components of the principal component analysis (PCA) with heavy metals; OC, components of the PCA with organic contaminants; structure, structural degradation. Spring: two convergent solutions, two dimensions, stress = 0.17; autumn: two convergent solutions, two dimensions, stress = 0.21).</p

River systems with respective streams, abbreviations (abbr.), and number of sampling sites (no.).

<p>River systems with respective streams, abbreviations (abbr.), and number of sampling sites (no.).</p