Abstract
This paper presents the results of an observational study carried out for monitoring three sites along the Moskva River with different pollution levels by using chlorophyll fluorescence parameters. The photosynthetic activity of phytoplankton along the river bed was diverse. The photochemical activity of the phytoplankton was higher in the relatively clean water of the river (the entrance of the river to the city) and lower in the polluted water (middle reaches of the river and at the exit of the city). The efficiency of the light reactions of photosynthesis in photosystem II (FV/FM, PIABS) for the phytoplankton was higher in the spring than in the summer months. These processes were accompanied by a decrease in the dissipation of absorbed energy into heat (φDo). Incubation of the phytoplankton from the Moskva River in the presence of mercury chloride salts was performed. It was found that addition of mercury chloride salts resulted in different sensitivity to the toxic effects of phytoplankton samples collected from different sites along the river, as well as lower resistance of phytoplankton to mercury in summer season compared to that in the spring. The most sensitive parameter to the toxic effects of mercury was the photosystem II performance index (PIABS), which can be recommended for bioassay and biomonitoring of the activity of photosynthetic reactions of phytoplankton in natural conditions.
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Funding
The study was carried out within the framework of the Development Program of the Interdisciplinary Scientific and Educational School of Lomonosov Moscow State University named “The future of the planet and global environmental changes” with financial support from the Russian Foundation for Basic Research (grant no. 20-04-00465a) and the Russian Science Foundation (grant no. 20-64-46018).
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The authors declare that they have no conflicts of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.
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Translated by V. Mittova
Abbreviations: PS II, photosystem II; RC, reaction center; QA and QB, primary and secondary quinone electron acceptors; KWP, Kuryanovsk water-treatment plant.
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Protopopov, F.F., Todorenko, D.A., Nikolaev, I.N. et al. The Fluorescence of Phytoplankton Chlorophyll from the Moskva River in the Presence of Mercury Ions. BIOPHYSICS 66, 779–785 (2021). https://doi.org/10.1134/S0006350921050195
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DOI: https://doi.org/10.1134/S0006350921050195