Home – Home – Jornals – Flora and Vegetation of Asian Russia 2024 number 4

In this article we present the results of the study of littoral diatom complexes of Lake Shunet (Republic of Khakassia), which belongs to the drainless meromictic lakes of the arid zone. There are results of complex hydrobiological research on this water body, but the floristic component is not sufficiently studied, so an inventory of taxa is important for replenishing information about the diatom flora of the lake. In samples collected in 2017-2020 in Lake Shunet, we identified 179 species (189 species and intraspecific taxa) of diatoms belonging to 16 orders, 35 families, and 71 genera. The most widely represented families are Bacillariaceae (30 species), Naviculaceae (18), Cymbellaceae (12), Eunotiaceae (10), Mastogloiaceae (9) and genera: Nitzschia (17 species), Navicula (13), Eunotia (10), Tryblionella (8), Gomphonema , Mastogloia , Pinnularia (7 species each). The minimum diversity of diatoms is typical for the plankton of the lake - 25 species and intraspecific taxa, with the dominance of cyanobacteria Planktolyngbya contorta (Lemmermann) Anagnostidis et Komárek. Benthos and periphyton have the same number of species and intra-species algal taxa - 123. Complexes of dominant taxa have the following composition in these communities: Ctenophora pulchella (Ralfs ex Kützing) D.M. Williams et Round, Cocconeis scutellum var. minutissima Grunow, C . euglypta Ehrenberg, C . placentula Ehrenberg, Haslea spicula (Hickie) Bukhtiyarova, Navicula salinarum Grunow, Pleurosigma elongatum W. Smith, Brachysira aponina Kützing, Pseudostaurosira brevistriata (Grunow) D.M. Williams et Round, Surirella striatula Turpin. Diatom assemblages of the lake consist of freshwater, brackish-water and marine taxa, with a relatively high proportion of halophobes likely coming from the stream and deposited on the sediments.