A biological survey often reveals the degree and type ot river pollution. High temperatures, high turbidity and toxic chemicals cause the disappearance of many members of the normal flora and fauna. Organic wastes, e.g., sewage, support large numbers of organisms which cause decay and there is a succession downstream of special pollution communities of animals usually found in stagnant, still waters.
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References
1.
HynesH. B. N.The Biology of Polluted Waters.1960 202 pp. (Liverpool University Press) is a very lucid account by a freshwater biologist who has worked on many different aquatic animals; it should be useful to all interested in and concerned with the welfare of inland waters.
2.
KleinL.Aspects of River Pollution. 1957621 pp. (Butterworths Scientific Publications) presents mainly the viewpoint of an experienced water chemist but includes chapters by a zoologist with much information about fishes and by a biologist who discusses plants and invertebrate animals.
