Phytoplankton of the Вarents sea

On the basis of the analysis of summer plankton phytocenosis structure, 4 areas representing various stages of a succession cycle are allocated for water areas of the Barents Sea. In the most productive places of the water area the level of phytoplankton growth corresponded to indicators of mesotrophic-eutrophic waters and was maximum in the northern area. Concentration of phosphates was the main regulator of bloom of coccolithophore Emilianiahuxleyi, besides water temperature. The presence in the modern plankton phytoсenosis structure in the northern part of sea (80ºN) of the Atlantic species, along with annual bloom of E. huxleyi in the southwest part of the sea, are the indicators of increased «atlantification» of the Arctic Region.