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Mercury concentrations in oligohaline wetland vegetation and associated soil biogeochemistry

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Abstract

Concentrations of mercury were determined in above- and below-ground tissues of dominant plant species, as well as soils, in the wetlands of Lake Maurepas, Louisiana. Indicators of wetland soil biogeochemical status, such as soil redox potential, pore-water nutrient concentrations, and pore-water total sulfides, were also determined. Total mercury concentrations in plant tissues were within the typical range for vegetation not exposed to mercury contamination. Similarly, total mercury concentrations in soils were typical of uncontaminated wetlands within this geographic region. Soil methyl mercury levels in this study are slightly lower than those reported in other studies of nearby wetlands. This may reflect the less extensive geographic sampling in this study, or the low water levels in the Lake Maurepas system immediately prior to and during this study, which would have altered soil biogeochemical status. This is corroborated by measurements of soil redox potential and soil pore-water nitrogen and sulfur constituents conducted during this study that suggest minimal sulfate reduction was occurring in surficial soils. This study indicates that the wetlands surrounding Lake Maurepas are typical of many uncontaminated oligohaline wetlands in the southeastern U.S. in regard to mercury concentrations.

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Authors and Affiliations

  1. Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA

    Jonathan M. Willis & Robert P. Gambrell

  2. Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, 70504, USA

    Jonathan M. Willis

  3. Coastal Plant Ecology Laboratory, Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, 70504, USA

    Mark W. Hester

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  1. Jonathan M. Willis
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  2. Robert P. Gambrell
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  3. Mark W. Hester
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Correspondence to Jonathan M. Willis.

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Willis, J.M., Gambrell, R.P. & Hester, M.W. Mercury concentrations in oligohaline wetland vegetation and associated soil biogeochemistry. Environ Monit Assess 181, 373–383 (2011). https://doi.org/10.1007/s10661-010-1835-3

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  • DOI: https://doi.org/10.1007/s10661-010-1835-3

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