The notions of normal and pathological states of aquatic ecosystems are 

 closely associated with the whole complex of other ecological concepts such 

 as preservation of homeostasis, transformation of community structure, a 

 shift of dominant forms, disturbances of bio-geochemical cycles, system buf- 

 fering, detoxification potential and, finally, with the concept of entropy 

 and negative entropy system. 



From this point of view we consider the study of the general problems of 

 pathology of aquatic ecosystems in the light of the second principle of 

 thermodynamics. The consideration of the problem of detoxification of 

 waters should then be from the view of life as a negatively entropic pro- 

 cess, evoked by our planet to retain energy, and to prevent its dispersion 

 into space. 



In the same way that consideration of the flux of substances and energy 

 in aquatic systems from a position of the law of conservation of energy pro- 

 moted fruitful solution of many problems in productional hydrobiology, the 

 analysis of aquatic ecosystem responses to toxicants effects in the light 

 of the second principle of thermodynamics may significantly stimulate our 

 understanding of the destructive and reduction processes and factors, deter- 

 mining the stability and degradation of aquatic ecosystems, and the hydro- 

 biosphere as a whole. 



REFERENCES 



Braginsky, L.P. 1975. An ecological approach to the investigation of me- 

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 cology. Published by "Science Thoughts", Kiev, pp. 5-15. 



Braginsky, L.P., V.D. Byeskaravaynara, and E.P. Shchyerban. 1977. Reaction 

 of freshwater phyto- and zooplankton to waterborne pesticides. Pub- 

 lished by Academy of Sciences of the USSR, 10 p. 



Gepther, V.A. 1977. Influence herbicides (Monoron, Dioron and Kotopan) 



microhabitat collector, drainage-irrigation systems Turkmen and Uzbecki- 

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Helme, G.F. 1968. The basis of physics of the biosphere. Hydrometeriolo- 

 gist, Leningrad, 299 p. 



Holden, A.V. 1972. Contamination of freshwater by persistant insecticides 

 and their effects on fish. Ann. Appl . Biol., 55, pp. 332-335. 



Kamshilov, M.M. 1973. Buffering of living systems. Journal Social 

 Biology, 34, No. 2, pp. 174-194. 



Kamshilov, M.M. 1977. Norms and pathology in a functional aquatic eco- 

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