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Long-Term Trends in the Content of Sedimentary Pigments in the Gorky Reservoir

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This paper presents the first data on the vertical distribution of plant pigments in silts accumulated in the Gorky Reservoir from its filling in 1955 to 2010. Cores of gray clayey silts in the upper (the city of Yur’evets) and lower (the city of Chkalovsk) zones of the lake-like part of the reservoir are analyzed. The organic matter content varied within 7–30% and the total content of chlorophyll a together with pheopigments was within 23–213 μg/g dry sediment, or 0.3–1.3 mg/g organic matter. The content of pigments increased from the base to the surface in cores from mesotrophic to eutrophic values in the upper zone and to hypertrophic values in the lower one. The trends of the vertical distribution of plant pigments in silts correspond to an increase in phytoplankton productivity.

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Funding

This work was performed as part of state assignments nos. 121051100099-5 and 121051100104-6.

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Correspondence to N. A. Timofeeva.

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Conflict of interest. The authors declare that they have no conflicts of interest.

Statement on the welfare of animals. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Translated by I. Bel’chenko

Abbreviations: BS, bottom sediments; Chl, chlorophyll a; OM, organic matter; Ph, pheopigments.

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Timofeeva, N.A., Sigareva, L.E. & Zakonnov, V.V. Long-Term Trends in the Content of Sedimentary Pigments in the Gorky Reservoir. Inland Water Biol 15, 497–500 (2022). https://doi.org/10.1134/S1995082922040435

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