Water control and impoundments the aquatic side
1963
Jackson, P.B.N.
Man's impact in water control and impoundment is great and increasing rapidly in tropical countries. Though sometimes underground water is extensively pumped, I most water con1lrol schemes start with a barrier impounding flowing.water; tending towards an increase in area of standing water on the earth, usually richer in nutrients than the flowing water before impoundment. New waters are colonized, rapidly by aquatic organisms, plants forming a succession towards climax species. Explosive reproduction of organisms, including an exotic species in Kariba and discussed. Tropical fish usually prefer the new standing to old running water conditions, resulting in numerical increases though the composition
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