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

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

Huey-Min Hwang 1,* email, Neisee McArthur 1 , Clifford Ochs 2  and Bruce Libman 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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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.
Keywords: Agrichemicals; bacterial assemblages; wetland; mesocosm

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MDPI and ACS Style

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.

AMA Style

Hwang H-M, McArthur N, Ochs C, Libman B. Assessing Interactions of Multiple Agrichemicals by Using Bacterial Assemblages in a Wetland Mesocosm System. International Journal of Environmental Research and Public Health. 2005; 2(2):328-334.

Chicago/Turabian Style

Hwang, Huey-Min; McArthur, Neisee; Ochs, Clifford; Libman, Bruce. 2005. "Assessing Interactions of Multiple Agrichemicals by Using Bacterial Assemblages in a Wetland Mesocosm System." Int. J. Environ. Res. Public Health 2, no. 2: 328-334.

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