Abstract
The phytoplankton communities of the Sviyaga River, the right-bank tributary of the Volga River, were studied. It was characterized by high taxonomic diversity. In total, 365 taxa of microalgae with a rank below genus were registered during the study period. Green algae and diatoms were the most diverse groups. The data obtained in 1984 and 2016 were compared; by the XXI century, the role of Planktotrichet-type algae has increased, as well as their share in the total species richness (by 10%). The distribution of the Ponto-Caspian invading diatom species Skeletonema subsalsum and Actinocyclus variabilis within the Volga River basin has been checked. These species were found in the estuarine phytoplankton communities of the Sviyaga River.
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