You are here:
The acute and chronic toxicity of major geochemical ions to Hyalella azteca Ion interactions and comparisons to other species
Citation:
Erickson, R., Dave Mount, B. Forsman, T. Highland, R. Hockett, D. Hoff, C. Jenson, AND T. Norberg-King. The acute and chronic toxicity of major geochemical ions to Hyalella azteca Ion interactions and comparisons to other species. SETAC North America, Orlando, FL, November 06 - 10, 2016.
Impact/Purpose:
not applicable
Description:
We have previously reported that the acute and chronic toxicities of major geochemical ions (Na, K, Ca, Mg, Cl, SO4, HCO3) to Ceriodaphnia dubia can involve multiple, independent mechanisms. The toxicities of K, Mg, and Ca salts were best related to the chemical activity of the cation, while the toxicities of Na salts also reflected an influence of other ions and were well correlated with osmolarity. The toxicities of Na and Mg salts were also inversely correlated to Ca and the toxicity of K salts were similarly inversely correlated to Na. However, research by us and others on other freshwater species, including insects, molluscs, and fish, have shown certain inter-species differences regarding these relationships. In this talk, we will report on major geochemical ion toxicity to another crustacean, Hyalella azteca. This species also shows both similarities to and differences from C. dubia. Notable similarities include a high toxicity of K, independent action of Mg and Na salts, and a strong ameliorative effect of Ca on the toxicities of Na and Mg salts. Notable differences included significant variation in the relative toxicities of different salts, and sodium salt toxicity not being correlated with osmolarity but rather suggesting a more specific role of sodium and sulfate. Unlike C. dubia, H. azteca also shows marked differences in the acute:chronic ratios across different salts. This work further emphasizes the need to consider interspecies differences in developing assessment methods for complex ion mixtures.