February 19, 2005. USGS, 2000 USGS, 1997 * “New approaches are necessary to better elucidate, track, and quantify Hg sources and transformations in.

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Presentation transcript:

February 19, 2005

USGS, 2000 USGS, 1997

* “New approaches are necessary to better elucidate, track, and quantify Hg sources and transformations in the environment” (Bergquist and Blum); especially methylmercury. * Mercury exhibits both mass dependent and mass independent fractionation in ecological pathways though photoreduction is the only mechanism that exhibited significant mass independent fractionation (MIF in MeHg is more pronounced than iHg during photoreduction experiments). * Degree of MIF is greater in large dissolved organic carbon (DOC) conditions * Fractionation may be dependent on the type of DOC (GSL and wetland sediments)

* Brine shrimp have been found to have elevated levels of Hg in summer/fall (Naftz, 2008) * Eared grebes Hg concentration increased three-fold over the fall molting period (Naftz, 2008) * Many duck species have exceeded EPA limits (.3 mg/kg Hg dry weight) (Peterson, 2008) * What about other organisms/plants?

Figure from Greg Carling Image from Greg Carling