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Microcystins in Cyanobacterial Biofilms from the Littoral Zone of Lake Baikal

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Abstract

Some species of cyanobacteria synthesize toxins whose concentration during water bloom can reach values dangerous for human and animal health. Planktonic cyanobacteria are the most common and well-studied microcystins producers, hepatotoxic cyclic heptapeptides, whereas microcystin-producing benthic cyanobacteria are less known. In recent years, the mass development of benthic cyanobacteria forming extensive fouling on different substrates has been detected in the littoral zone of Lake Baikal. We found microcystins produced by benthic cyanobacteria in the biofouling on different natural and artificial substrates, including diseased and dead endemic sponges Lubomirskia baicalensis and Baikalospongia spp. collected from the littoral area of Lake Baikal. Microscopic analysis of the biofouling revealed prevalence of representatives of Nostocales and Oscillatoriales with predominance of Tolypothrix distorta that is likely the main microcystin producer in Lake Baikal. According to enzyme-linked immunosorbent assay (ELISA), microcystin concentrations in biofouling were 29.8–3050 μg/kg dry weight. We identified eight microcystin variants using MALDI-TOF/TOF; [Dha7]MC-YR was detected in most samples. The presence of microcystins in biofilms formed on the surface of the artificial substrate by Phormidium autumnale was also recorded. The data obtained demonstrated the necessity to monitor potentially toxic species and concentrations of cyanotoxins in plankton and benthos in the littoral zone of Lake Baikal, especially in the regions with intense tourist and recreational activities.

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Authors and Affiliations

  1. Limnological Institute, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    O. I. Belykh, G. A. Fedorova, A. V. Kuzmin, I. V. Tikhonova, O. A. Timoshkin & E. G. Sorokovikova

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  1. O. I. Belykh
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  2. G. A. Fedorova
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  3. A. V. Kuzmin
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  4. I. V. Tikhonova
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  5. O. A. Timoshkin
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  6. E. G. Sorokovikova
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Correspondence to O. I. Belykh.

Additional information

Original Russian Text © O.I. Belykh, G.A. Fedorova, A.V. Kuzmin, I.V. Tikhonova, O.A. Timoshkin, E.G. Sorokovikova, 2017, published in Vestnik Moskovskogo Universiteta, Seriya 16: Biologiya, 2017, Vol. 72, No. 4, pp. 262–269.

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Belykh, O.I., Fedorova, G.A., Kuzmin, A.V. et al. Microcystins in Cyanobacterial Biofilms from the Littoral Zone of Lake Baikal. Moscow Univ. Biol.Sci. Bull. 72, 225–231 (2017). https://doi.org/10.3103/S0096392517040022

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  • DOI: https://doi.org/10.3103/S0096392517040022

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