CLIMATIC TRANSFORMATION OF HYDROLOGICAL REGIME AND PLANKTON IN THE MOZHAISK RESERVOIR

K. K. Edelshtein, M. G. Ershova, M. G. Grechushnikova, and N. G. Puklakova

Results of the statistical analysis of long-term variations of 40 characteristics of the meteorological, hydrological, hydrochemical, thermal, and hydrobiological regime of the Mozhaisk reservoir (the upper Moscow River) for the entire period of its existence (1960—2000) are dealt with. It is found that relatively small climate changes stimulated a significant transformation of water level fluctuations and water exchange in the reservoir and increased its mineralization and water surface temperature variability during the vegetation period. Biomass of spring phytoplankton increased and biomass of summer phytoplankton practically did not change because of the increased CaCO3 crystallization in the trophogenous layer of the water body. In this layer, microcrystalls of chemogenic calcite are the sorbent of phosphates in the afternoon hours; therefore, the intensity of photosynthesis and biomass of blue-green algae and dinophyta decrease under steady anticyclonic weather.

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