Abstract
Abstract—The seasonal changes of the photosynthetic processes of phytoplankton in three reservoirs of the Zvenigorod Biological Station named after S.N. Skadovsky of Moscow State University (ZBS MSU) were studied by using chlorophyll fluorescence. It was shown that a high level of photosynthetic activity was observed in the Olgin and Pozharny reservoirs (where a high level of phytoplankton was found) in the summer months. The high level of photosynthetic activity of algae was manifested in the high efficiency of electron transport (φEo) and the performance index of PSII (PIABS). At a high level of the photosynthetic activity of phytoplankton in these reservoirs low rates of non-photochemical quenching (NPQ) were observed, whereas the efficiency of electron transport (φEo) of phytoplankton in Sterlyazhy reservoir was reduced in the summer. The dependence between the light reactions of phytoplankton and seasonal changes of hydrochemical composition of water and the species composition of phytoplankton in the studied reservoirs was shown. It is proposed to use fluorescence parameters (PIABS and φEo) as indicators of the state of phytoplankton in aquatic environments.
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