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Int. J. Environ. Res. Public Health 2005, 2(2), 328-334; doi:10.3390/ijerph2005020019

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

1,* , 1, 2 and 3
1 Department of Biology, Jackson State University, Jackson, MS 39217, USA 2 Department of Biology, University of Mississippi, University, MS 38677, USA 3 Department of Biology, Wesleyan University, Middletown, CT 06459, USA
* Author to whom correspondence should be addressed.
Received: 10 January 2005 / Accepted: 10 April 2005 / Published: 14 August 2005
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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.
Keywords: Agrichemicals; bacterial assemblages; wetland; mesocosm Agrichemicals; bacterial assemblages; wetland; mesocosm
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hwang, H.-M.; McArthur, N.; Ochs, C.; Libman, B. Assessing Interactions of Multiple Agrichemicals by Using Bacterial Assemblages in a Wetland Mesocosm System. Int. J. Environ. Res. Public Health 2005, 2, 328-334.

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