Zooplankton distribution in the superficial layer of the Sheksna Reservoir


  • V. N. Stolbunova Institute of Biology of Inland Waters, Russian Academy of Sciences

Abstract

The results of the studies of zooplankton collected in the superficial layer in different parts of the Sheksna Reservoir at the beginning of the August 2007 are presented. A total of 71 species have been recorded among which crustaceans prevail in the number of species, abundance and biomass. Zooplankton is distributed unevenly in the surface layer; the maximum density and biomass are recorded in the north-eastern part of the Lake Beloye – 164 000 ind/m3 and 1.06 g/m3, in the Sizma extension – 124 000 ind/m3 and 1.60 g/m3 and in the near-dam reach - 185 000 ind/m3 and 1.36 g/m3, respectively. The minimum values are recorded near the mouths of rivers Kovzha Belozerskaya (17 000 ind/m3 and 0.10 g/m3) and Kema (10 000 ind/m3 and 0.06 g/m3). Because of high concentration of fine-dispersed mineral suspended matter the water transparency decreases significantly. The water is polluted with the oil products and the rotifers of the genus Brachionus – indicators of polluted water – are dominated in the plankton. Zooplankton in the surface layer where blue-green algae are in mass differs from deeper horizons in lower abundance and biomass. 

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Published
2012-03-09
Section
Articles