Nikulina T.V.
V.Ya.Levanidov memorial lectures 2019; (8): 114-125
Species composition of plankton cyanobacteria and algae and the structure of phytoplankton communities of the main bed of the Amur River and the Kanikurgan Channel (above and below the bridge in the sector of Blagoveshchensk (Russia) and Heihe (China)) were investigated in May-July 2018. 139 species, varieties and forms were found from 6 divisions (Cyanobacteria, Bacillariophyta, Charophyta, Chlorophyta, Heterokontophyta, Rhodophyta) and 58 genera. Diatoms (84,9% of the total species composition) formed the basis of the algal flora. The phytoplankton of the Amur River in the sector of the new bridge in the spring-summer period of 2018 was characterized by the diatoms mass vegetation ( Nitzschia acicularis , Tabellaria flocculosa, Fragilaria capucina var. mesolepta , F. capucina var. vaucheriae , Asterionella formosa , Ulnaria ulna , Aulacoseira islandica и Hannaea arcus var. rectus ). Total number and biomass of cyanobacteria and plankton algae varied within N = 0.326-0.7524 million cells/l and B = 0.2618-2.0545 mg/l. The summer complex of the dominant phytoplankton species of the Kanikurgan Channel was represented by species from Heterokontophyta, Bacillariophyta, and Charophyta divisions. The maximum abundance and biomass values belong to the species Dinobryon divergens, A. formosa, F. capucina var. mesolepta and Mougeotia sp. ster . Assessment of water quality (by Pantle-Buck's method as modified by Sládeček): the waters of the Middle Amur River in the sector of the Blagoveshchensk City belong to the betamezosaprobic zone and III class of water quality, and waters are classified as slightly polluted.
