Assessment of the quality of freshwater ecosystems based on the functional condition of bivalved mollusks

In order to assess the impact of cyanobacteria on mollusks under experimental conditions, the interaction of toxic and non-toxic strains of cyanobacteria Microcystis aeruginosa (Kützing) Kützing and bivalve mollusks Unio pictorum (L., 1758) was studied. Cyanobacteria have a negative effect on bivalve mollusks: 40% death of mollusks and deterioration of their adaptive capacity were recorded when co-cultivated with M. aeruginosa at a high cell concentration. At the same time, there was no difference in the mortality of mollusks incubated with toxic and non-toxic cyanobacteria. A decrease in the content of microcystin LR in the presence of bivalves was revealed. No statistically significant increase in the number of cyanobacteria in the water was noted after transit passage through the digestive system of bivalves.

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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

Холодкевич¹

2022

Transactions of Papanin Institute for Biology of Inland Waters RAS

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The current state of the concept of the health of aquatic ecosystems and the main methods and technologies (mainly instrumental) for its assessment are briefly considered. The data obtained during the study of the health of ecosystems of several recreational areas of the Black Sea, the eastern part of the Gulf of Finland, several channels of the Volga delta are considered. An operational assessment of the health of ecosystems was carried out using innovative biomonitoring technology by testing the health of adult bivalve mollusks living in them by the functional load method based on the analysis of their heart rate, measured using the BioArgus bioelectronic fiber-optic system. It has been established that the functional state of mollusks can serve as an indicator of excess pollution of coastal waters by objects that discharge insufficiently treated domestic wastewater from their local treatment facilities, including household wastewater. It is concluded that, taking into account the rather high rapidity and ease of use, this technology can be effectively used to solve the problems of screening studies and early diagnostics of the state of aquatic ecosystems as well as serve as an information basis for developing regionally oriented, science-based environmental management decisions.

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Assessment of the quality of freshwater ecosystems based on the functional condition of bivalved mollusks

Cited by 3 publications

References 14 publications

Heavy Metals in Macrozoobenthos and Sediments of the Coastal Zone of the Eastern Gulf of Finland

Heavy Metals in Macrozoobenthos and Sediments of the Coastal Zone of the Eastern Gulf of Finland

Responses of <i>Unio pictorum</i> to the Presence of Toxic and Non-Toxic Strains of <i>Microcystis aeruginosa</i>

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

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