on man. Preference is given to the oligosaprobic state of a reservoir over 

 the polysaprobic state. Aquatic organisms, as we know, are given preference 

 in accordance with their physiology and biology. For them, a normal body of 

 water is that which best corresponds to their physiologic and biologic pecu- 

 liarities. A polysaprobic organism cannot live in pure water (oligosapro- 

 bic) and vice versa. Evaluation of what is normal in a reservoir can be 

 performed by man, based on the principles outlined above. 



Each organism also evaluates the quality of water in a reservoir. Can 

 it live or not? Based on this evaluation, we can evaluate the usefulness of 

 the ecosystem for man. Otherwise, we fall into unanswerable questions. 



REFERENCES 



Budyko, M.I. 1977. Global'naya ekologiya (Global ecology). Mysl' Press, 

 pp. 4-316. 



Douglas, William 0. 1975. The Three-Hundred Year War. A chronicle of 

 ecologic struggle. Progress Press, Moscow, pp. 5-238. 



Meadows, D.H., D.L. Meadows, J. Randers, and W.W. Behrens. 1972. The 



limits to growth: A report for the Club of Homes Protection the Predi- 

 cament of Mankind. New York, pp. 2-72. 



Oldak, P.G. 1979. A global strategy. Khimiya i zhizn'. No. 5, pp. 11-1?. 



Stroganov, N.S. 1977. The meaning of the concept of norm and pathology in 

 water toxicology. Norma i patologiya v vodnoy toksikologii, Baykal'sk, 

 pp. 5-11. 



Stroganov, N.S. 1978. Pressing problems of water toxicology in connection 

 with preservation of reservoirs from chemical pollutants. Elementy 

 vodnykh ekosistem. Nauka Press, Moscow, pp. 150-73. 



Stroganov, N.S, A.I. Putintsev, Ye.F. Isakova, and V.I. Shifin. 1979. A 

 method of toxicologic testing of wastewater. Biologicheskiye nauki. No. 

 2, pp. 90-96. 



Vernadskiy, V.I. 1967. Biosphere. Mysl' Press, Moscow, pp. 225-359. 



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