STRUCTURAL TRANSFORMATION OF AQUATIC COMPLEXES OF A LOWLAND RESERVOIR
Long-term (almost 70-year) observations carried out at the Ivankovskoye reservoir provide information on the dynamics of the structure of its aquatic complexes. Specific features of aquatic complexes evolution at the level of facies were revealed, i.e. decreasing area of terrestrial complexes, their transformation into pelagic complexes under pelagic-profundal conditions, into psammitic complexes under open littoral conditions and into phytocomplexes and floating bog complexes under closed littoral conditions. Pelagic and phyto- complexes became predominant in the reservoir. Processes of aquatic complexes formation during the 70-year evolution of the reservoir are mainly related to the accumulation of mineral and organic matter.