Abstract
SUMMARY The numbers of aerobic heterotrophic bacteria in the waters and sediments of the small turbid impoundment, Wuras Dam, are very high (≥100 000 ml −1 and ≥ 1x106 bacteria g−1 respectively). Viable bacterial numbers in the open water seem to depend on suspen-soid concentrations and the regression line: is proposed to describe this relationship. Allochthonous inputs of suspensoids and resuspension of surface sediment layers seem to influence suspensoid concentrations of the open water and hence the bacterial numbers. In the littoral zone dense stands of Phragmites australis and Typha latifolia sub-species capensis seem to increase the numbers of viable bacteria of the surface water. There were significantly (p = 0,05) higher numbers here compared to the surface of the open water. The microbiology of the waters and sediments of this turbid impoundment appears to differ greatly from that of clear water lakes.
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