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Are Methylmercury Concentrations in the Wetlands of Kejimkujik National Park, Nova Scotia, Canada, Dependent on Geology?

^a Dep. of Soil Science, Univ. of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
^b Dep. of Biology, Univ. of Ottawa, 30 Marie Curie, Ottawa, ON, Canada K1N 6N5
^c Geological Survey of Canada, 601 Booth Street, Ottawa, ON, Canada K1A 0E8
^d Institute of Geological and Nuclear Sciences, P.O. Box 30368, Lower Hutt, New Zealand

View larger version (68K): [in a new window]   Fig. 1. Bedrock geology of study area with sampling sites indicated. The lower panel indicates the watershed boundaries for the sampling area.

View larger version (37K): [in a new window]   Fig. 2. Organic matter and methylmercury (MeHg) (open bars) as well as pH and total Hg (closed bars) in wetlands found on different lithologies. Closed circles indicate acid volatile sulfide or surface complexation model estimate of percentage of total Hg sorbed to bacteria in different lithologies. Note the 1000-fold difference in the scales for MeHg and Hg. Error bars indicate standard error of the estimate.

View larger version (20K): [in a new window]   Fig. 3. Influence of wetland type on mercury-methyltransferase (HgMT) activity (closed bars) and sulfate reduction rate (closed circles). Error bars are standard error of methyltransferase activity and one quartile for sulfate reduction rate. U, one unit of HgMT activity was defined as the formation of 1 nmol of tetrahydrofolate formed in response to the addition of 1 ng of Hg to the reaction vessel.

View larger version (23K): [in a new window]   Fig. 4. Principle component analysis of fatty acid methyl esters (FAME) present in wetland soil from Kejimkujik monzogranite (diamond), greywacke (circle), black sulfidic slate (square) or gray sulfidic slate (triangle). Open symbols are the average principle component scores for each lithology and closed symbols are the average principle component scores for each site. Inserted graph is the relative weighting of established Desulfobulbus FAME biomarkers for Principle Component 1 and 2.