Abstract
The distribution of zinc-tolerant bacteria in sediments from three stream sites containing high (3125 μg g−1), medium (291 μg g−1), and low (109 μg g−1) concentrations of Zn was determined. Zinc tolerance was estimated by the ability of bacteria to grow on media amended with Zn concentrations ranging from 4 to 512 mg 1−1. The presence of Zn-tolerant bacteria was correlated with the degree of heavy metal contamination; this correlation was more closely associated with readily extractable heavy metal concentrations than with the more rigorously extracted heavy metals. Low concentrations of Zn in media (4 to 16 mg 1−1) were stimulatory to growth of bacteria from contaminated sites while concentrations as low as 4 mg 1−1 were inhibitory to bacteria from the control site.
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