Herbicide concentrations in wetlands in west central Minnesota, 1992

Metadata Updated: May 12, 2018

Thirty emergent, seasonally to semi-permanently flooded wetlands in an intensively farmed area of west central Minnesota were sampled before and during the 1992 crop growing season to determine surface water concentrations of three widely used herbicide groups. Specifically, water obtained from ten isolated wetlands (“reference”) on Federal Waterfowl Production Areas (WPAs), four WPA “treatment" wetlands, and 16 privately owned "treatment" wetlands was analyzed to determine whether, and to what extent, wetland basins both adjacent to, and isolated from, private agricultural lands contained measurable concentrations of alachlor, triazine and phenoxy acid herbicides. Surface water samples were screened for the three class herbicide types using enzyme-linked immunosorbent (ELISA) assays. Low concentrations of all three herbicide classes were detected in surface waters from WPA “reference” wetlands. The range of triazine concentrations detected within the ten “reference” WPAs was 0.019-0.546 parts per billion (ppb), whereas alachlor and phenoxy acid concentration ranges were 0.048-0.432 ppb and 0.004-0.764 ppb, respectively. Presently, herbicide occurrence at these concentrations has not been shown to adversely impact aquatic macrophytes or invertebrates. Triazine and alachlor concentrations in some “treatment” WPA ditches and private wetlands (4.17 and 5.27 ppb triazine 2.41 and 6.56 ppb alachlor, respectively) were similar and exceeded maximum concentrations in “reference” WPA wetlands. Phenoxy acid herbicide concentrations in privately owned wetlands (0.000-1.100 ppb) and “treatment” (0.003-0.193 ppb) and “reference” WPA wetlands were found to have similar low concentrations. Alachlor and triazine herbicide concentrations in the "treatment" wetlands suggest at minimum, the potential for aquatic toxicity, as indicated under laboratory conditions, and help define additional directions for assessment of pesticide exposure and related toxic effects to prairie pothole aquatic life.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date December 2, 2017
Metadata Updated Date May 12, 2018

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date December 2, 2017
Metadata Updated Date May 12, 2018
Publisher Fish and Wildlife Service
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Brent Frakes
Maintainer Email
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Data Quality true
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Harvest Source Title FWS-servecat
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Source Hash 783401bada1f1e7f90e83c0ab3f3fd1e46376ff3
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