Impact of acidification on the methylmercury cycle of remote seepage lakes
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Concentrations of monomethylmercury [CH3Hg] were measured in the water and seston of five nearly pristine Wisconsin lakes, which span a range of pH from about 4.6 to 7.2. Previous studies had established a clear inverse relationship between [CH3Hg] in fish and the pH of lakes in this region. Here, we examined the pH dependency of [CH3Hg] in lake water and explored the partitioning of CH3Hg between water, seston, and fish as a function of pH. Results indicate that [CH3Hg] in lake water tends to increase as pH decreases, but that seasonal and spatial variability of [CH3Hg] in individual lakes confounds a simple analysis of the relationship. The partitioning of CH3Hg was related only weakly, if at all, to pH. Average partitioning coefficients (log kd=log (Cp/Cw)) were higher for yearling yellow perch (6.0 to 6.5) than for seston (5.5 to 6.0) but did not vary significantly between lakes. This suggests that acidification has a stronger effect on the supply of CH3Hg to the ecosystem than on specific rates of uptake by the biota.
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- Impact of acidification on the methylmercury cycle of remote seepage lakes
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Volume 56, Issue 1 , pp 477-491
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- 1. Brooks Rand, Ltd., 3950 6th Avenue N. W., 98107, Seattle, WA, USA
- 2. Bureau of Research Wisconsin Dept. of Natural Resources & Center for Limnology, University of Wisconsin Madison, Trout Lake Station, 54512, Boulder Junction, WI, USA
- 3. Center for Limnology University of Wisconsin, Madison 680 N. Park St., 53706, Madison, WI, USA