Enhanced Susceptibility of Methylmercury Bioaccumulation into Seston of the Laurentian Great Lakes
نویسندگان
چکیده
Mercury concentrations in the Laurentian Great Lakes waters are among lowest reported literature, while game fish approach consumption advisory limits, particularly Superior, Huron, and Michigan, indicating efficient methylmercury transfer from water to fish. To determine if increased efficiency is evident within lower food web, we measured (2010–2018) mercury dissolved organic carbon (DOC) water, size-sieved seston, dietary tracers (carbon nitrogen isotope ratios), phytoplankton bioaccumulation, biomagnification between increasing seston size fractions. We observed consistently low filter-passing (<0.010 ng L–1) comparatively variable DOC (1.1 3.4 mg concentrations. Methylmercury factors were similar lakes. Bioaccumulation highest literature (log 5.5 6.1), exceeding those oceans, smaller lakes, streams, was influenced by DOC. Higher bioaccumulation rates increase susceptibility of accumulation into web. Because dominantly delivered through atmosphere biota therein highly susceptible uptake, propose that excellent sentinels trace success efforts decrease global emissions (e.g., Minamata Treaty) future.
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ژورنال
عنوان ژورنال: Environmental Science & Technology
سال: 2021
ISSN: ['1520-5851', '0013-936X']
DOI: https://doi.org/10.1021/acs.est.1c02319