The neurotoxin methylmercury can accumulate in marine food webs, contaminating seafood. An analysis of the isotopic composition of fish in the North Pacific suggests that much of the mercury that enters the marine food web originates from low-oxygen subsurface waters.
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Cossa, D. Methylmercury manufacture. Nature Geosci 6, 810–811 (2013). https://doi.org/10.1038/ngeo1967
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DOI: https://doi.org/10.1038/ngeo1967
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