Abstract
Abstract The copper and nickel tolerance of Scenedesmus acutiformis f.alternans isolated from a lake containing elevated copper and nickel has been studied in some detail. In order to investigate the possibility of co‐tolerance for other metals, and to compare tolerance mechanisms, the toxicity and uptake of several other elements was determined in pure culture. The copper tolerant algae showed increased tolerance to nickel, zinc, silver and cobalt when compared with a reference isolate. For cadmium and gold the situation was reversed, and for lead there were inconsistencies depending upon concentration. It was concluded that the data do not provide evidence for tolerance to metals other than those which were elevated in the lake, and thus co‐tolerance does not appear to have evolved. At comparable metal concentrations in the medium, metal uptake by the laboratory isolate was always higher for copper, nickel and cobalt, but the situation was reversed for cadmium. When uptake was related to percent inhibit...
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