An Examination of the Factors that Control Methylmercury Production and Bioaccumulation in Maryland Reservoirs Draft Final Report June, 2006 Cynthia C. Gilmour Smithsonian Environmental Research Center Edgewater, MD 21032 Robert P. Mason Dept. Marine Sciences University of Connecticut Groton, CT 06340 Andrew Heyes Chesapeake Biological Laboratory University of Maryland, Center for Environmental Science Solomons, MD, 20688 Mark Castro Appalachian Laboratory University of Maryland, Center for Environmental Science Frostburg, MD 21532
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An Examination of the Factors that Control Methylmercury Production and Bioaccumulation in Maryland Reservoirs Draft Final Report June, 2006 Cynthia C.
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An Examination of the Factors that Control Methylmercury Production and
Bioaccumulation in Maryland Reservoirs
Draft Final ReportJune, 2006
Cynthia C. Gilmour Smithsonian Environmental Research CenterEdgewater, MD 21032
Robert P. Mason Dept. Marine Sciences University of ConnecticutGroton, CT 06340
Andrew Heyes Chesapeake Biological LaboratoryUniversity of Maryland, Center for Environmental ScienceSolomons, MD, 20688
Mark CastroAppalachian Laboratory University of Maryland, Center for Environmental ScienceFrostburg, MD 21532
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200
400
600
800
1000Coastal
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AppalachianPlateau
Mercury concentrations in largemouth bass in Maryland reservoirs, size-normalized to a 370 mm fish (data from Gilmour et al. “An Examination of the Factors that Control Methylmercury Production and Bioaccumulation in Maryland Reservoirs” MD DNR in review).
What drives the differences in MeHg in fish among Maryland reservoirs?What can be done to limit MeHg bioaccumulation in Maryland?
EPA’s Ambient Water Quality Criterion (AWQC) for Hg in fish tissue is 235 ug/kg
Parameters used to examine controls on Hg in Maryland fish
Factors that affect Hg deposition and transport: Watershed sizeWatershed:lake areaLandusePhysiographic provinceReservoir capacityHydraulic residence timeWater chemistrySediment
Factors that affect net methylation:Water chemistry