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Mercury levels in fish fluctuate along with water levels in lakes

A new study has found an unexpected connection between water levels in lakes and toxic mercury levels in fish. When droughts cause water levels to drop, the levels of mercury found in fish also plummet. In wetter weather, water levels rise and levels of mercury in fish increase.  The phenomenon was discovered by a team of scientists from the University of Wisconsin–Madison and Wisconsin Department of Natural Resources as they examined long-term data from several lakes in northern Wisconsin. In previous work, the researchers had found that, roughly once a decade, water levels in the northwestern Great Lakes and northern Wisconsin's inland lakes fluctuate between high and low levels and back again.  Read more...

 

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