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  1. With the data obtained by hydrobiological monitoring of water objects of Don river for many years (1978-1988) calculation of rank distribution parameters and indexes of dominance for phytoplankton species abundance was conducted. The borders of investigated characteristics are calculated. They correspond to borders of ecological well-being - trouble conditions of phytoplankton communities. Ecologically tolerable levels for the core abiotic factors are found. Contribution of each of analyzed factors to a degree of ecological trouble is established.

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International Interdisciplinary Conference "Mathematics. Computing. Education"