Abstract
The program of investigations on the taxonomic composition and spatial distribution of planktonic microalgae in the Gulf of Ob and the southern Kara Sea in different seasons was carried out. Throughout the observation period, from July to October, high values of phytoplankton biomass were recorded in the Gulf of Ob and adjacent areas of the Ob–Yenisei shoal. This is evidence for a higher productivity of waters off the Ob estuary, compared to other coastal areas of the Kara Sea. The main factor responsible for this phenomenon is permanent (during the warm season) transport of living and dead organic matter by river runoff to the shelf.
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