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The book deals with the new basic concepts of terrestrial and aquatic ecosystems and, particularly, the meaning of ecosystem evolution. The concepts of stress in physical, biological and ecological systems are compared and discussed in detail. The importance of natural and anthropogenic stresses in aquatic and terrestrial ecosystems is illustrated. Negative perturbation, called stress, is distinguished from the concept of subsidy, which is a modification leading to amelioration of the system. In addition, to quantify the stress in a steady-state ecosystem, the advantages and disadvantages of biochemical indicators are discussed. Some selected examples are given to illustrate the concepts of natural and man-made catastrophies, the anthropogenic impact on environmental conditions and the chronic stress produced by man and natural fluctuations. Other examples discussed include biomanipulation of aquatic food chains to improve water quality in eutrophic lakes, lake ecosystem degradation and recovery studied by the enclosure method, air pollutant effects on terrestrial and aquatic ecosystems and their restoration, together with the effects of mining and of heavy metal pollution.

Additional information

Authors: RAVERA O (EDITOR), JRC Ispra (IT)
Bibliographic Reference: EUR 12054 EN (1989) 369 pp.
Availability: Available from Elsevier Science Publishers B.V., Sara Burgerhartstraat 25, P.O. Box 211, 1000 AE Amsterdam (NL)
ISBN: ISBN 0-444-87361-9
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