Chlorophyll content and factors affecting its spatial distribution in the Middle Volga reservoirs |
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Authors: | N M Mineeva A S Litvinov I E Stepanova M Yu Kochetkova |
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Institution: | 1. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, 152742, Russia 2. Center of Laboratory Analysis and Monitoring of the Ministry of Natural Resources in the Volga Federal Region, ul. Rozhdestvenskaya 38, Nizhni Novgorod, 603001, Russia
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Abstract: | On the basis of the data obtained during field observations in the summer low water period of 2001, the patterns of chlorophyll
distribution and its relation to hydrological and hydrochemical factors in two eutrophic reservoirs of the Middle Volga are
studied. The hydrological structure of the Gorky Reservoir, where the Volga water mass dominates, is homogeneous, while in
the Cheboksary Reservoir along with the eutrophic Volga waters, the mesotrophic Oka water masses can be distinguished keeping
their abiotic and biotic features over a long distance. Phytoplankton in the two contiguous reservoirs with different flow
regimens and anthropogenic loads responds differently to the external influence. An autotrophic community in the Gorky Reservoir
is more stable and depends little on abiotic factors which account for ∼63% of the explained chlorophyll variation. In the
Cheboksary Reservoir under maximal for the Volga cascade flow velocity and anthropogenic load, the development and distribution
of phytoplankton are almost completely (R
2 = 0.93) controlled by these factors. The trophic state of the reservoirs has not changed as compared to the beginning of
the 1990s. |
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Keywords: | |
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