Abstract
The studies were conducted under the integrated monitoring of the Rybinsk and Ivankovo reservoirs. The work is devoted to the assessment of long-term environmental changes under the influence of natural and anthropogenic factors. It was suggested to combine the two traditional methods of analysis. Initially, diatom complexes from bottom sediments were analyzed layer by layer. Then the results obtained were compared with the available information database on the species composition of phytoplankton complexes. Information about phytoplankton was avalible as a result of biomonitoring of reservoirs. The possibility of carrying out the work was determined by the fact that monitoring in the water area of the Rybinsk and Ivankovsky reservoirs was carried out for several decades. It was proposed to assess the reliability and comparability of the results obtained in assessing changes in the trophic status of reservoirs. The saprobity index (S) was calculated for diatom complexes from sediments. The data obtained was compared with similar calculations for the species structure of phytoplankton complexes.
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