The cause of mercury pollution at such a pristine place could be nearby gold mining, a well-documented source of methylmercury in the Brazilian Amazon (methylmercury is the organic form of mercury that can be harmful to people and wildlife). It’s also possible that the source-point is further away, since mercury released into the atmosphere can travel long distances before being deposited in an ecosystem and undergoing methylation.
But what the mercury means for willets is still unclear.
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