TY JOUR TI THE EVOLUTIONARY DEVELOPMENT AND CURRENT STATE OF LAKE NERO ACCORDING TO SAPROPEL ANALYSIS KW lake ecosystem KW bottom sediments – sapropel KW hydrophysical and hydrochemical parameters KW retrospective assessment JO Transactions of Papanin Institute for Biology of Inland Waters RAS AU Zakonnov, V.V. AU Pozdnyakov, S.R. AU Kondratiev, S.A. AU Ignatieva, N.V. AU Tsvetkov, A.V. AU Zakonnova, A.V. PY 2020 IS 0 PB Papanin Institute for Biology of Inland Waters Russian Academy of Sciences