van Dam RA, Hogan AC, McCullough CD, Houston, MA, Humphrey CL, Harford AJ. 2010. Aquatic toxicity of magnesium sulfate, and the influence of calcium, in very low ionic concentration water. Environ Toxicol Chem 29:410–421.

Figure 2c was incorrect. Figure 2 should be replaced with the figure below.

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Figure 2. Toxicity of magnesium (added as magnesium chloride) and sulfate (added as sodium sulfate) in natural Magela Creek water (Australia) to Lemna aequinoctialis (A); Amerianna cumingi (B); and Hydra viridissima (C). Individual data points represent means ± standard errors (refer to Table 1 for sample sizes).

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