Riverine communities structure in riffles, which inhabited Russian sprilin (Alburnoides rossicus Berg) in the eastern part of its area

The comprehensive description of the riverine communities of riffles which inhabited by the russian sprilin by the example of different types of watercources in the eastern part of its range have been given for the first time. The key species of algae, higher aquatic plants, zooplankton, zoobenthos, invertebrate drift and fishes, which make up the specific “appearance” of the community, have been identified. Higher aquatic vegetation, plankto- and ichthyofauna were characterized by low species richness, algoflora, benthic fauna and syrton were very rich in species. By the end of summer, the studied biotope was heavily overgrowning with the plant association of meakin, clasping-leaved pondweed and filamentous algae (Ulotrix or Cladophora). The maximum species richness and abundance of benthic invertebrates were observed in July-August. The russian sprilin was dominated by the number and/or biomass in the fish community of most rivers.