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The Current Trophic State and Water Quality of Lake Onego

  • STRUCTURE AND FUNCTIONING OF AQUATIC ECOSYSTEMS
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Abstract

The trophic state and water quality of Lake Onegо have been assessed under climate warming and changes in anthropogenic load over the past 30 years. The water body retains its natural oligotrophic state during the summer stratification according to the concentration of Chl a. A small amount of readily mineralizable organic matter in water determines the low level of development of saprophytic bacteria, corresponding to xenosaprobic and β-oligosaprobic waters. Only Kondopogskaya Bay in Lake Onego is characterized by a higher trophic level (mesotrophic) and water saprobity (β-mesosaprobic) due to pollution by wastewater from the PPM and waste from trout farms. The local bloom of cyanobacteria in the open area of the lake was observed during the anomalous heating of the epilimnion in the summer of 2022 for the first time in the 50-year history of research. The increase in the concentration of humic substances in the water of the bays as a result of climate warming at this stage did not lead to a change in the level of saprophytic bacteria.

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Notes

  1. Syarki M.T., Tekanova E.V., and Chekryzheva T.A., Plankton of the Pelagial of Lake Onego. Certificate of state registration of the database no. 2015620274 dated. Copyright holder: Federal State Budgetary Institution of Science Northern Water Problems Institute of the Karelian Research Center of the Russian Academy of Sciences. Date of state registration in the register of databases February 13, 2015.

  2. Sabylina A.V., Tekanova E.V., and Kalinkina N.M., Chlorophyll a in the Water of Lake Onego. Certificate of state registration of the database no. 2018621068. Copyright holder: Federal State Budgetary Institution of Science Karelian Research Center of the Russian Academy of Sciences. Date of state registration in the database register June 13, 2018.

  3. GOST 31958–2012 (ISO 8245:1999): Water. Methods for Determination of Total and Dissolved Organic Carbon, Moscow: Standardinform, 2014.

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ACKNOWLEDGMENTS

We thank A.V. Tolstikov and A.P. Georgiev for help in organizing the work and O.V. Derusova for help in digitizing maps (Northern Water Problems Institute, Karelian Research Center, Russian Academy of Sciences).

Funding

This work was carried out as part of the state task of the Northern Water Problems Institute of the Karelian Research Center of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Northern Water Problems Institute, Karelian Research Centre, Russian Academy of Sciences, Petrozavodsk, Republic of Karelia, Russia

    E. V. Tekanova, N. M. Kalinkina, E. M. Makarova & V. S. Smirnova

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  1. E. V. Tekanova
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  2. N. M. Kalinkina
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  3. E. M. Makarova
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Correspondence to E. V. Tekanova.

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Abbreviations: Chl a, chlorophyll a; PPM, pulp and paper mill.

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Tekanova, E.V., Kalinkina, N.M., Makarova, E.M. et al. The Current Trophic State and Water Quality of Lake Onego. Inland Water Biol 16, 967–973 (2023). https://doi.org/10.1134/S1995082923060251

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