Relationship between accumulation and toxicity of zinc in Stigeoclonium (Chaetophorales, Chlorophyta)

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Abstract
A study was made of zinc concentrations in field populations of Stigeoclonium and the aqueous chemistry of sites from which the materials were harvested; the sites included streams polluted by old mines. A significant positive relationship between zinc in the alga and that in the water was obtained when data were plotted on log10-log10 axes; its predictive ability was improved further by use of multiple stepwise regression (MSR) procedures to account for the influence of other environmental factors. The relationship between accumulation and toxicity was studied using the present and previously published data for toxicity (measured as tolerance index concentration). In both cases the environmental variables affecting Zn accumulation indicated during the first three MSR steps were (aqueous) Zn, Fe and Mg and/or Ca. Accumulation increased at a faster rate than toxicity with increasing environmental concentrations of zinc.

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