Abstract
Two diatom species, Amphora coffeaeformis (found on an organotin plus copper-based, self-polishing copolymer [Spc], antifouling paint) and Nitzschia ovalis-(found on conventional copper-based antifouling paints but not on the former) were tested for tolerance to the toxins released by SPC. Measurements for growth, net photosynthesis, and silicate and nitrate uptake all indicated that A. coffeaeformis can tolerate 10–100 times greater concentrations of SPC toxins than N. ovalis. Both species showed a recovery in cell division rate after 24–48 h of exposure to sublethal but inhibitory levels. A 24-h time course study of the toxic effects of SPC leachates showed that for N. ovalis silicate uptake was more sensitive to the immediate (< 2h) toxic effects than was nitrate uptake. The latter was actually enhanced for the first 8h exposure and only was inhibited after 12 h. In the case of A. coffeaeformis, nitrate uptake was initially inhibited but recovered after 24h of exposure.
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