Nikulina T.V., Motylkova I.V.
V.Ya.Levanidov memorial lectures 2025; (11)
Data on the algal flora of the Ai River, Naiba River and Ochepukha River (Sakhalin Island) are presented for the first time - the species composition and dominant species are identified, and the ecological-geographical characteristics are presented. The quantitative characteristics and distribution of the number and biomass of periphyton cyanobacteria and algae along the width of the Ochepukha River bed are studied. The composition is formed by cyanobacteria, dinoflagellates, diatoms and green algae (totaling 140 species and intraspecific taxa). Floristically, diatoms are the most richly represented. In the ecological-geographical respect, benthic forms, alkaliphiles, indi erent to changes in salinity and cosmopolitans prevail, in the sanitary-biological respect - oligoand oligo-betamesosaprobes. The quantitative characteristics of summer periphyton algal communities for the Ochepukha River vary widely: abundance - from 0,03 to 45,68 billion cells/m2, biomass - from 0,004 to 2,63 g/m2. The average abundance of cyanobacteria and algae in June is 1,83 billion cells/m2, biomass - 0,81 g/m2. In July, these indicators decrease and are respectively equal to 0,15 billion cells/m2 and 0,32 g/m2.
