Appendix S1. Main characteristics of the different water types (based on Jochems et al., 2002).

Appendix S2. Overview of the different sampling locations with indication of the number of samples analysed before and after the invasion by Dikerogammarus villosus, the river type (Rg=large river, Rzg=very large river) and physicochemical  and hydromorphological parameters. BOD5: 5-day biological oxygen demand, COD: chemical oxygen demand, EC20: conductivity, NH4+: ammonium, KjN: Kjeldahl nitrogen, oPO4: orthophosphate concentration, P tot: total phosphorous concentration, NA: not available).

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