Summer plankton communities of the Northern Dvina River and its tributaries

The work is a part of comprehensive study the rivers south-east Arkhangelsk region, carried out with aim developing aquaculture in inland waters. Qualitative and quantitative characteristics for plankton communities state Northern Dvina River such as species composition, abundance, biomass were obtained summer period 2021. For tributaries these first time. diversity phytoplankton saprobiological waters assessed using indices. An assessment watercourses trophicity was out. 133 taxa microalgae from eight systematic divisions, nine zooplankter three taxonomic groups have been identified. basis algoflora has established to be diatoms, green algae, cyanobacteria. Zooplankton characterized cladocerne-rotifers, significant predominance cladocerans. data can used ecological monitoring region aquatic ecosystems, assessing fish productivity water bodies, calculating damage biological resources economic activity.