Nutrient and suspended-sediment concentrations in the Maumee River and tributaries during 2019 rain-induced fallow conditions |
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| Affiliation: | 1. U.S Geological Survey, OH-KY-IN Water Science Center, 9818 Bluegrass Parkway, Louisville, KY 40299, USA;2. U.S. Geological Survey, OH-KY-IN Water Science Center, 6460 Busch Blvd, Suite 100, Columbus, OH 43229, USA;3. U.S. Geological Survey, OH-KY-IN Water Science Center, 5957 Lakeside Blvd, Indianapolis, IN 46278, USA;4. U.S. Geological Survey, Upper Midwest Water Science Center, 5840 Enterprise Drive, Lansing, MI 48911, USA;1. Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, 701 North Point Drive, Winthrop Harbor, IL 60096, USA;2. Department of Chemical and Biological Sciences, Youngstown State University, One University Plaza, Youngstown, OH 44555, USA;3. Department of Geography and the Environment, Suite G67, Mendel Science Center, Villanova University, 800 E. Lancaster Avenue, Villanova, PA 19085, USA;1. Aquatic Ecology Laboratory, Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 1314 Kinnear Road, 230 Research Center, Columbus, OH 43212 USA;2. Aquatic Ecology Laboratory, Department of Evolution, Ecology, and Organismal Biology, Translational Data Analytics Institute, The Ohio State University, 1314 Kinnear Road, 230 Research Center, Columbus, OH 43212 USA;3. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105 USA;1. Department of Environmental Science, Penn State Erie – The Behrend College, Erie, PA 16563, USA;2. Dutton e-Education Institute, Penn State University, University Park, PA 16802, USA;1. Department of Geological and Environmental Sciences, Hope College, P. O. Box 9000, Holland, MI 49422-9000, USA;2. Grand Haven High School, 17001 Ferris, Grand Haven, MI 49417, USA;3. Department of Mathematics and Statistics, Hope College, P. O. Box 9000, Holland, MI 49422-9000, USA;1. Daniel P. Haerther Center for Conservation and Research, John G. Shedd Aquarium, 1200 S Lake Shore Drive, Chicago, IL 60605, USA;2. Department of Wildlife, Fish & Conservation Biology, University of California Davis, Davis CA 95616, USA;3. Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, Michigan State University, Hammond Bay Biological Station, 11188 Ray Dr., Millersburg, MI 49759, USA;4. Great Lakes Science Center, U.S. Geological Survey, Hammond Bay Biological Station, 11188 Ray Dr., Millersburg, MI 49759, USA;5. Great Lakes Science Center, U.S. Geological Survey, 1451 Green Road, Ann Arbor, MI 48105, USA;6. Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, Michigan State University, 480 Wilson Rd, East Lansing, MI 48824, USA;1. U.S. Fish and Wildlife Service, Lower Mississippi River Fish and Wildlife Conservation Office, 111 E. Elizabeth St., Tupelo, MS 38804, United States;2. U.S. Fish and Wildlife Service, Ashland Fish and Wildlife Conservation Office, 2800 Lake Shore Dr. E. Ashland, Wisconsin 54806, United States |
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| Abstract: | Above average precipitation from October 2018 through July 2019 in the Maumee River (R.) Basin resulted in 29% of cropland left fallow, providing a glimpse of potential effects from decreased nutrient application. Ongoing monitoring at 15 water-quality sites on the Maumee R. upstream from Defiance enabled comparison with 2017, which was hydrologically similar to 2019 in precipitation and streamflow. In 2019, nitrate (as nitrogen; NO3-N) for March-July was significantly less than previous years (2015–2018), but the response for phosphorus (P) was more complicated. Relative to 2017, total P (TP) was lower at 7 of 15 sites, but higher at 7, reflecting higher suspended sediment (SS). Dissolved P (DP) was generally lower, but less different than NO3; DP was higher at 3 sites. DP-P:NO3-N was generally higher in 2019, DP-P:TP was lower, and there was less TP relative to SS. Overall, less P was in the system in 2019. However smaller streams showed a large range of difference between 2019 and 2017 for all constituents, indicating variability in land management and physiography. In contrast, all constituents were lower in 2019 in larger (>5000 km2) streams, including the Maumee R. near Defiance, where the difference in NO3 (?37%) exceeded that for TP (?16%), DP (?10%), and SS (?20%). Differences in these relations among N, P, and SS indicate that P was available from legacy sources that are more difficult to distinguish during typical agricultural production years and that some material from 2019 was stored in the system upstream from the largest sites. |
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| Keywords: | Hydrology Sediment transport Streams Water resource management Watershed analyses Phosphorus Agricultural management |
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