The Fluorescence of Phytoplankton Chlorophyll from the Moskva River in the Presence of Mercury Ions

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 activi...

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Bibliographic Details
Published in:Biophysics (Oxford) 2021-09, Vol.66 (5), p.779-785
Main Authors: Protopopov, F. F., Todorenko, D. A., Nikolaev, I. N., Alekseev, A. A., Bratkovskaya, L. B., Matorin, D. N.
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biomonitoring
Biophysics
Cell Biophysics
Chlorophyll
Mercuric chloride
Photosynthesis
Photosystem II
Physics
Physics and Astronomy
Phytoplankton
Pollution levels
Rivers
Salts
Summer
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Summary: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 ( F V / F M , PI ABS ) 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 (φ Do ). 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 ( PI ABS ), which can be recommended for bioassay and biomonitoring of the activity of photosynthetic reactions of phytoplankton in natural conditions.
ISSN:0006-3509
1555-6654
DOI:10.1134/S0006350921050195