Figure 3

Structure of native communities explained by variation partitioning among time (Period: with levels T1—XIXth century, T2—1995–2000, T3—2020), environmental features (human impact—Impact, and habitat—Hab: R—river, lotic sector; L—lake, a lentic sector in reservoirs) and the selected alien invasive species—AIS (Drepol—Dreissena polymorpha, Sinwoo—Sinanodonta woodiana, Vivace—Viviparus acerosus, Phyacu—Physa acuta). RDA with hierarchical permutation scheme was used, interactive forward selection of predictors; both simple and conditional effects are significant (p < 0.01).