TY JOUR TI THE EXPERIENCE OF SCREENING STUDIES ON THE MARINE AND FRESHWATER ECOSYSTEM “HEALTH” BASED ON AN OPERATIONAL STATE ASSESSMENT OF BIVALVES BY THE METHOD OF FUNCTIONAL LOAD. PROBLEMS AND PROSPECTS OF DEVELOPMENT KW biomonitoring KW biomarkers KW functional state of animals KW bioindication KW health of aquatic ecosystems KW heart rate of molluscs JO Transactions of Papanin Institute for Biology of Inland Waters RAS AU Kholodkevich, S.V. PY 2022 IS 0 PB Papanin Institute for Biology of Inland Waters Russian Academy of Sciences