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Microbial Mats as a Pathway for Bioaccumulation of Monomethyl-Mercury in a Thermal Area Aquatic Food Web. Mercury (Hg) occurs naturally in various forms in the soil and water of thermal areas of Yellowstone National Park. Hg(II) in spring water is transformed to monomethylated Hg (MeHg) by microbial populations associated with mats of the green alga Zygogonium in a number of acidic springs within the Park. Our research has found that larvae of a soldier fly species (Diptera:Stratiomyidae) selective graze specific populations of several algae within the mat community. This grazing behavior results in elevated levels of MeHg in the gut and tissues of the larvae. Future research will be directed to the investigation of further biomagnification of MeHg in avian populations in the area that feed on the insect larvae, and identification and characterization of the microorganisms that mediate the methylation reaction.
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