Taxonomic structure and ecology-geographical characteristic of phytoperiphyton in the Lyutoga River (Sakhalin Island)

The article provides the data on phytoperiphyton composition in the basin of the Lutoga River, which is an ecologically significant water course of Sakhalin Island. In result of surveying the estuary, main channel and tributaries of the Lyutoga River from February to December of 2011, the species composition of phytoperiphyton was identified, assemblage of dominant species was found, ecology-geographical characteristic (geographical distribution, habitat association, salinity, pH, saprobity) was described. The transformations of the species composition of phytoperiphyton were studied with distance from the estuarine zone to the upper reaches of the river. Algal flora was presented with 303 species and intraspecific taxa of microalgae and cyanobacteria belonged to 9 phyla, 16 classes, 40 orders, 65 families and 107 genera (annotated list see in the Appendix). It was based on diatoms, among which the leading families were Bacillariaceae and Naviculaceae, and the leading genera were Nitzschia and Navicula. For the first time, 34 species and intraspecific taxa of microalgae and cyanobacteria are indicated for inland water bodies of the Sakhalin region. With distance from the estuarine zone to the upper reaches of the river, the number of species, geographical groupings, planktonic forms, and alphamesosaprobiont species decreased. Mass development of Hannaea arcus f. recta were observed in the spring-summer period, Melosira varians and Rhoicosphenia abbreviata – in the autumn-winter.