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Ostroumov S.A. Criteria of ecological hazards due to anthropogenic effects on the biota: searching for a system. - Doklady Biological Sciences, 2000. Vol. 371, P. 204-206. 2 tables. Bibliogr. 14 refs. Translated from Russian: Ostroumov S.A. Criteria for assessing ecological hazards of man-made impact on biota: seaching for a system. - Doklady Akademii Nauk, 2000, Vol. 371. No. P.844-846. The currently accepted system of criteria of evaluating ecological hazards from man-made chemicals (which is used in W.Europe, N.America and in some other countries) is outdated and vulnerable to criticism. The author proposed a new concept of the system of criteria for evaluating the ecological hazard from man-made impact. The author suggested to assess man-made impacts (including effects of pollutants and xenobiotics) on biota according to the following four levels of disturbance in biological and ecological systems: (1) the level of individual and populational responses; (2) the level of aggregated responses; (3) the level of stability and integrity of the ecosystem; (4) the level of contributions of the ecosystem into biospheric processes. An example is given of how to apply the proposed system of criteria to the analysis of concrete experimental data. To exemplify the efficiency of the proposed system of criteria, it is shown how to use it to analyze new data on effects of a non-ionic surfactant on water filtering by bivalves. It is concluded that the proposed system of criteria will be helpful in better assessing ecological hazards from anthropogenic effects on biota including effects of man-made chemicals polluting ecosystems. A new system of principles for analysis of man-made impact: the level-block approach to analysis of ecological hazards (Tab.1); synthetic surfactant Triton X-100 (0.5 mg/L) inhibits water filtering by bivalve mussels Mytilus edulis (Tab. 2) "The proposed level–block approach to analysis of ecological hazards of anthropogenic alterations in ecosystems allows the multiplicity of anthropogenic effects on the biota to be systematized. This approach may be used to develop criteria for estimation and classification of ecological hazards due to anthropogenic effects" (p.206)]. ISSN 0012-4966. Distributed by Springer, orderdept@springer-sbm.com http://scipeople.ru/users/2943391/; http://sites.google.com/site/2000dbs371p204criteria/