Abstract
In wetlands, the presence of macrophytes and associated organisms may alter the redox chemistry of Hg, affecting the cycling of atmospheric Hg species at the air/water interface. As part of a contribution to the Collaborative Mercury Research Network (COMERN), we investigated the spatial distribution of dissolved gaseous mercury (DGM) in subsurface waters from the Baie St. Francois wetland, in the St Lawrence River DGM concentrations varied in different macrophyte beds and in macrophyte-free areas, ranging from 48.6 to 75.3 pg/L (1388-2151% saturation relative to atmospheric equilibrium). The highest DGM concentration was observed in the bed of Elodea canadensis, a submerged plant, and the lowest, in open areas. The results indicated that macrophyte beds may constitute a significant site for Hg reduction. Macrophytes may also interfere with the evasion of Hg to the atmosphere, by providing a shelter against wind and waves.
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