Abstract - Mercury at all tested concentrations was found to be less toxic to Chlorococcum infusionum than to Ankistrodesmus falcatus. Ankistrodesmus growth was inhibited at all the tested doses of the metal while Chlorococcum remained unaffected up to 0.005µM of Hg2+. A reduction of chlorophyll and protein content, decrease in Chl a/b ratio, and accumulation of glycolate was observed at inhibitory concentrations of Hg2+ whereas amino acid synthesis was not significantly affected. Both the used carbon sources caused a reduction of Hg2+ toxicity to the test algae, glucose being more effective than glutamate.
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