Abstract
The studies were carried out with the integrated monitoring of the Ivankovo and Rybinsk reservoirs. The work is devoted to the assessment of long-term changes in the trophic status of water bodies under the influence of natural and anthropogenic influence. The studies combined two traditional methods of analysis. A layer-by-layer study of diatom complexes in bottom sediments and the determination of the taxonomic composition of phytoplankton in reservoirs were carried out. The saprobity index (S) was calculated for diatom complexes from sediments. A comparison was made with similar calculations for the species structure of phytoplankton complexes. Spatial and temporal heterogeneity of saprobization processes in reservoirs was confirmed.
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