Results of partial redundancy analysis (pRDA).

Exploring the amount of variance in macroinvertebrate community composition explained by pesticide toxicity (TUmax), nutrient enrichment (SRP) and habitat alteration (temperature and sedimentation index). We shown the degrees of freedom (dfmodel, dfresidual), adjusted R2 (R2adj), associated p-values (p; after permutation tests using 999 randomizations), additive expectation (sum of R2adj of individual stressors), and interaction type (A; antagonistic when R2adj of interaction is lower than the sum of individual stressors; S, synergistic when R2adj of interaction surpasses the sum of individual stressors).