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Assessing Interactions of Multiple Agrichemicals by Using Bacterial Assemblages in a Wetland Mesocosm System

Author

Listed:
  • Huey-Min Hwang

    (Department of Biology, Jackson State University, Jackson, MS 39217, USA)

  • Neisee McArthur

    (Department of Biology, Jackson State University, Jackson, MS 39217, USA)

  • Clifford Ochs

    (Department of Biology, University of Mississippi, University, MS 38677, USA)

  • Bruce Libman

    (Department of Biology, Wesleyan University, Middletown, CT 06459, USA)

Abstract

Agrichemicals may enter wetlands located adjacent to or downstream from agricultural fields. We investigated the individual and interactive effects of three agrichemicals [atrazine, chlorpyrifos, and monosodium acid methanearsonate (MSMA)] and methyl mercury on abundance and heterotrophic potential of wetland heterotrophic bacteria assemblages. We used a factorial experimental design, in which chemicals were introduced in all possible combinations to 66 500-liter mesocosms at the Biological Field Station of the University of Mississippi. Methyl mercury was added to bring the total mercury (HG) concentration to 0.4 mg/Kg wet weight at the sediment surface. Atrazine, chlorpyrifos, and MSMA were added at concentrations of 192, 51, and 219μg/L, respectively. Over 32 days of exposure, microbial heterotrophic activity was sensitive to only the interactive effect of HG*ATR*CPF in the sediments and only CPF in the water. Total bacterial numbers did not exhibit any significant treatment effects. Therefore, the effects of agrichemicals were reflected on cell-specific bacterial heterotrophic activity rather than bacterial population size.

Suggested Citation

  • Huey-Min Hwang & Neisee McArthur & Clifford Ochs & Bruce Libman, 2005. "Assessing Interactions of Multiple Agrichemicals by Using Bacterial Assemblages in a Wetland Mesocosm System," IJERPH, MDPI, vol. 2(2), pages 1-7, August.
    • Handle: RePEc:gam:jijerp:v:2:y:2005:i:2:p:328-334:d:2748
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