The paper presents information on the state of the plankton community of the basin of the lower reaches of the Mezen River in the summer of 2023: qualitative and quantitative characteristics (species composition, abundance and biomass). The species diversity of phytoplankton and the saprobiological state of waters were assessed using indices. The assessment of the trophic waters of the studied area was carried out. 205 microalgae taxa from 8 systematic divisions and 47 zooplankter species from four taxonomic groups were identified in the water bodies of the basin of the lower reaches of the Mezen River. It has been established that the basis of algoflora consists of diatoms and green algae, as well as cyanobacteria. Zooplankton communities, according to their taxonomic structure, were characterized as cladoceran-copepod-rotifer, with a significant predominance of cladocerans. The work is part of a comprehensive study of rivers and lakes in the north-east of the Arkhangelsk region, carried out in 2023 with the aim of developing aquaculture of inland reservoirs. The data obtained can be used for ecological monitoring of the aquatic ecosystems of the region, for assessing the fish productivity of reservoirs and calculating damage to aquatic biological resources from economic activities.
Mezen River, water bodies, phytoplankton, zooplankton, species, diversity, indices, surface water quality
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