TY JOUR TI INTRA-ANNUAL VARIABILITY OF PLANKTON COMMUNITIES IN THE ESTUARY REGION OF THE SEVERNAYA DVINA RIVER KW Northern Dvina KW phytoplankton KW zooplankton KW abundance KW biomass KW Shannon index KW saprobity index JO Transactions of Papanin Institute for Biology of Inland Waters RAS AU Makedonskaya, I.Y. AU Medvedeva, E.V. AU Otchenash, N.G. AU Studenov, I.I. AU Tortsev, A.M. AU Konina, Y.M. PY 2023 IS 0 PB Papanin Institute for Biology of Inland Waters Russian Academy of Sciences