2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 11:00 AM - 11:15 AM | SPATIOTEMPORAL VARIATION IN TRIBUTARY NUTRIENT CONCENTRATIONS: A SEASONAL PERSPECTIVE FOR LAKE MICHIGAN | 430 B
SPATIOTEMPORAL VARIATION IN TRIBUTARY NUTRIENT CONCENTRATIONS: A SEASONAL PERSPECTIVE FOR LAKE MICHIGAN
Despite efforts to reduce nutrient loads to the Laurentian Great Lakes since the 1970’s, these inputs continue to cause coastal eutrophication and degrade ecosystem services. Tributaries are a key focus for managing nutrient loading, but controls on spatial and temporal variation in their nutrient concentrations have not been fully resolved. We circumnavigated Lake Michigan quarterly for 2 years to profile soluble reactive phosphorus (SRP), nitrate, and ammonium in ~100 tributaries that span the range of watershed size and land cover in the basin. Tributary nutrient concentrations were surprisingly dynamic across the seasonal cycle. SRP increases with urban and agricultural land cover, and the relationship is exacerbated during the summer. Nitrate concentrations increase with agriculture and watershed size, but were strongly attenuated by wetlands —especially in fall, winter, and spring. Our multi-year findings illustrate the challenges of limiting year-round nutrient loads to the Great Lakes, each of which has hundreds of time-varying tributaries.
- Landuse
- Loading
- Water Quality
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Presenters/Authors
Robert J. Mooney
(), Center for Limnology, University of Wisconsin - Madison, rjmooney@wisc.edu;
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Galen McKinley
(), Columbia University, mckinley@ldeo.columbia.edu;
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Lucas Gloege
(), Columbia University, gloege@ldeo.columbia.edu;
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Peter B. McIntyre
(), Cornell University, pbm3@cornell.ecu;
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