Phytoplankton Structure in the White Sea after Summer Bloom: Spatial Variability in Relation to Hydrophysical Conditionsстатья

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[1] Phytoplankton structure in the white sea after summer bloom: Spatial variability in relation to hydrophysical conditions / L. S. Zhitina, L. V. Ilyash, T. A. Belevich et al. // Contemporary Problems of Ecology. — 2016. — Vol. 9, no. 6. — P. 747–755. The species composition and phytoplankton biomass, concentrations of chlorophyll “a” (Chl) and nutrients, concurrent hydrophysical conditions were studied in the south part of the White Sea in July 10–15, 2012 during chlorophyll “a” decrease after summer peak. The water column stability varied, the concentration of dissolved silicon in upper mixed layer was closed to the range favorable for diatoms with exception of areas of intensive tide mixing and areas influenced by waters of Severnaya Dvina River. In surface layer the dinoflagellates dominated excepting of areas with intensive tide mixing where diatoms prevailed. Diatoms provided major contribution to biomass in different stations above, in and under pycnocline and in deep waters out of photic zone. Structural analysis has revealed three phytoplankton communities that corresponded to different depths: communities of photic zone, intermediate and deep layers. Extension of layers inhabited by different communities depended on water column stability and on genesis of water masses. Integrated values of phytoplankton biomass and Chl varied from 250 to 1188 mg С/m2, and from 22 to 51 mg/m2, correspondently.

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