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Made has been the analysis of the pelagic ecosystems state in the Western coastal waters of the Middle Caspian in winter period of 2020 in the Neftegavan area, Seaport of Makhachkala. The taxonomic composition of phytoplankton and zooplankton communities, and the density of hydrobionts inhabiting them have been determined. It is noted that in phytocenoses during mass blossom of Rhizosolenia calcar avis (Schultze,1843) the diatom water plants (Bacillariophyta) dominated, and in zooplankton communities the paddle-footed crustaceans, mainly acarcidis ( Acartai tonsa Dana,1843) dominated on abundance. All sampling stations were characterized by a high degree of similarity of phyto-zooplankton in taxonomic composition but they differed significantly in number and biomass.

FEATURES OF FORMATION OF THE WINTER PLANKTON COMMUNITIES IN THE NEFTEGAVAN (“OIL HARBOUR”) - MAKHACHKALA AREA OF THE MIDDLE COASTAL CASPIAN