2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 9:15 AM - 9:30 AM | RESPONSES OF AQUATIC INSECT EMERGENCE TO TILE DRAINS IN THE PRAIRIE POTHOLES | 410 B
RESPONSES OF AQUATIC INSECT EMERGENCE TO TILE DRAINS IN THE PRAIRIE POTHOLES
In the Prairie Potholes, tile drains are a key tool in the conversion of grasslands to croplands. To understand how tile drainage affects wetland ecosystems, we compared the responses of water quality and benthic and emerging aquatic insects among wetlands receiving runoff from tile drains (tiled), wetlands with only surface runoff (surface), and control wetlands with neither surface runoff nor tile drains (control). Over the two year study, dissolved selenium in tiled wetlands was up to 17-fold higher than controls, 13-fold higher than surface sites, and 2.4-fold higher than the EPA criterion for Se. Insect emergence biomass was generally lowest in tiled wetlands, particularly in June of the first year. However, both water quality and emergence biomass varied widely across years and seasons. Selenium concentrations in chironomids emerging from tile sites were up to 4-fold higher than controls, 2-fold higher than surface sites, and 2-fold higher than dietary risk thresholds for waterfowl. Because our strongest effects were observed in June, when ducklings feed on emerging chironomids, these results suggest that tile drains could pose a risk to waterfowl by altering the timing, amount, and quality of adult aquatic insect prey.
- Invertebrate
- Landuse
- Subsidy
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Presenters/Authors
Jeff Wesner
(), University of South Dakota, Jeff.Wesner@usd.edu;
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Brianna Henry
(), University of South Dakota, b.henry@eagle.clarion.edu;
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Jake Kerby
(), University of South Dakota, Jacob.kerby@usd.edu;
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