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Abstract
A method of graphical analysis of the diatom assemblages’ taxonomic structure allows revealing two main scenarios of their transformations. The first scenario is determined by the external abiotic influence during which the internal ecosystem parameters remain stable. The second scenario is determined by the change in the internal ecosystem parameters and corresponds to the transitional periods in the ecosystem development. The diatom assemblages of the bottom sediments from Lake Boroe (Novgorod oblast) and Lake Glubokoe (Moscow oblast) have been studied. Throughout the entire studied period (the last 500–550 years), only the first scenario was typical of the Lake Boroe ecosystem. As for Lake Glubokoe, we have revealed two periods during which the second scenario occurred and two transitional periods when the second scenario dominated. Thus, the ecosystem of Lake Boroe remained stable during the last 500 years, whereas the ecosystem of Lake Glubokoe underwent serious modifications.
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