John Wiley & Sons, Ltd.

Contrasting effects of chloride on growth, reproduction, and toxicant sensitivity in two genetically distinct strains of Hyalella azteca

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The strain of Hyalella azteca (Saussure: Amphipoda) commonly used for aquatic toxicity testing in the US has been shown to perform poorly in some standardized reconstituted waters frequently used for other test species. In 10‐ and 42‐day experiments, we show that growth and reproduction of the US Lab strain of H. azteca varies strongly with chloride concentration in the test water, with declining performance observed below 15 to 20 mg/L. In contrast to the chloride‐dependent performance of the US Lab strain of H. azteca, growth of a genetically distinct strain of H. azteca obtained from an Environment Canada laboratory in Burlington, Ontario, was not influenced by chloride concentration. In acute toxicity tests with the US Lab strain of H. azteca, the acute toxicity of sodium nitrate increased with decreasing chloride in a pattern similar not only to that observed for control growth, but also to previous acute toxicity testing with sodium sulfate. Subsequent testing with the Burlington strain showed no significant relationship between chloride concentration and the acute toxicity of sodium nitrate or sodium sulfate. These findings suggest that chloride‐dependent toxicity shown for the US Lab strain may be an unusual feature of that strain and perhaps not broadly representative of aquatic organisms as a whole. This article is protected by copyright. All rights reserved

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