Long-Term Trends in the Content of Sedimentary Pigments in the Gorky Reservoir
2022
Timofeeva, N. A. | Sigareva, L. E. | Zakonnov, V. V.
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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