Environmental Pollution, Jan, 2013, Vol.172, p.42(11)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2012.08.008 Byline: Paul M. Bradley (a), Celeste A. Journey (a), Mark E. Brigham (b), Douglas A. Burns (c), Daniel T. Button (d), Karen Riva-Murray (c) Abstract: To assess inter-comparability of fluvial mercury (Hg) observations at substantially different scales, Hg concentrations, yields, and bivariate-relations were evaluated at nested-basin locations in the Edisto River, South Carolina and Hudson River, New York. Differences between scales were observed for filtered methylmercury (FMeHg) in the Edisto (attributed to wetland coverage differences) but not in the Hudson. Total mercury (THg) concentrations and bivariate-relationships did not vary substantially with scale in either basin. Combining results of this and a previously published multi-basin study, fish Hg correlated strongly with sampled water FMeHg concentration (I = 0.78; p = 0.003) and annual FMeHg basin yield (I = 0.66; p = 0.026). Improved correlation (I = 0.88; p 〈 0.0001) was achieved with time-weighted mean annual FMeHg concentrations estimated from basin-specific LOADEST models and daily streamflow. Results suggest reasonable scalability and inter-comparability for different basin sizes if wetland area or related MeHg-source-area metrics are considered. Author Affiliation: (a) U.S. Geological Survey, 720 Gracern Rd, Columbia, SC 29210, USA (b) U.S. Geological Survey, 2280 Woodale Dr, Mounds View, MN 55112, USA (c) U.S. Geological Survey, 425 Jordan Rd, Troy, NY 12180, USA (d) U.S. Geological Survey, 6480 Doubletree Ave., Columbus, OH 43229, USA Article History: Received 15 February 2012; Revised 16 August 2012; Accepted 17 August 2012
Geomorphology -- Analysis ; Geomorphology -- Environmental Aspects ; Wetlands -- Analysis ; Wetlands -- Environmental Aspects ; Methylmercury Compounds -- Analysis ; Methylmercury Compounds -- Environmental Aspects ; Streamflow -- Analysis ; Streamflow -- Environmental Aspects ; Basins (Geology) -- Analysis ; Basins (Geology) -- Environmental Aspects
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