UDC

581.526.325.2(282.247.13)

Authors

Zmetnaya Mariya Ivanovna
North Branch of Knipovich Polar Research Institute of Marine Fisheries and Oceanography Uritskiy st., 17, Arkhangelsk, 163000, Russian Federation;
e-mail: Asolie@mail.ru
Novikova Yuliya Vladimirovna
North Branch of Knipovich Polar Research Institute of Marine Fisheries and Oceanography Uritskiy st., 17, Arkhangelsk, 163000, Russian Federation;
e-mail: juli-nv@mail.ru

Abstract

Current state of the phytoplankton community in the waters of the Northern Dvina river delta is described. The research is carried out in the framework of the hydro-biological observations of the “Northern Agency for Hydrometeorology and Environmental Monitoring” in 2014 in the delta of the Northern Dvina river: in the Korabelnyi sleeve, Maimaksa and Kuznechikha ducts. We examined the qualitative and quantitative characteristics of phytoplankton (species composition, abundance and biomass). 144 species of phytoplankton were revealed during the growing season, belonging to Bacillariophyta (diatoms), Chlorophyta (green algae), Chrysophyta (golden algae), Cryptophyta (Cryptomonad), Cyanophyta (blue-green algae), Dinophyta (dinoflagellates), Euglenophyta (Euglenophyta), Xantophyta (yellow-green algae) departments. We established a dominant species complex, which included diatoms Asterionella formosa, Cyclotella comta, Fragilaria crotonensis, Melosira granulata. At the beginning of the growing season (in June and July) the maximum values of biomass were observed, from August to October phytoplankton biomass declined. At the same time in June there was a high number of phytoplankton, from July to October its value varied considerably, reaching its peak in October. We assessed the degree of contamination of the aquatic environment: a saprobity index was revealed; the class of surface water quality was defined. According to the water quality classification of water bodies and watercourses by hydro-biological indices the waters of the delta of the Northern Dvina are attributed to the IInd water quality class (slightly polluted).

Keywords

delta of the Northern Dvina river, phytoplankton, biomass, surface water quality, saprobity index

References

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