Abstract
The macrozoobenthos cenoses in the Dnieper reservoirs' section with different hydrochemical and edaphic conditions were used as an example of homeostatic mechanisms functioning, providing the cenoses' stability at different levels of the biological systems' organization. At the genetic level they consist in natural selection of the species, able to occur under the certain environmental conditions. At the physiological level the mechanisms consist in the cenoses' forming of different complexity degree depending on character of their "energy subsidy". At the population level, the reproductive mechanism is realized to maintain the certain species' numbers after the impact of any damaging factor. At the cenotic level, the mechanisms are realized by the cenosis species' structure rehabilitation, which was formed under the certain abiotic conditions. At the ecosystem level, the cenotic macrozoobenthos structure is restored owing to the migrative mechanisms.
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