Climate change holds great potential to affect the Lake Erie ecosystem by altering the timing and magnitude of precipitationdriven river discharge and nutrient runoff in its highly agricultural watershed.Using the SWAThydrologic model and an ensemble of global climate models, we predicted Maumee River (Ohio) discharge during the 21 st centuryunder two Intergovernmental Panel on Climate Change (IPCC) greenhouse gas emissions scenarios: RCP4.5 (mid-range, moderate reductions) and RCP8.5 (high, "business as usual"). Annual dischargewas projected to increaseunder both scenarios, both in the near-century (RCP4.5=6.5%; RCP8.5=2.0%) and latecentury (RCP4.5=9.2%; RCP8.5=15.9%), owing to increased precipitation and reduced plant stomatal conductance.Holding fertilizer application rates at baseline levels, we found that reduced winter surface runoff and increased plant phosphorus (P) uptake led to a respective decrease in annual total P (TP)runoff in the near-century (RCP4.5=-4.3%;RCP8.5=-6.6%) and by the late-century(RCP4.5=-14.6%; RCP8.5=-7.8%). Likewise, soluble reactive P (SRP)runoff was predicted to decrease under both scenarios in the near-century (RCP4.5=-0.5%; RCP8.5=-3.5%) and by the late-century (RCP4.5=-11.8%; RCP8.5=-8.6%). By contrast, when fertilizer application was modeled to increase at the same rate as plant P uptake, TP loadingincreased4.0% (0.9%) in the near-century and 9.9% (24.6%) by the late-century and SRP loading increased 10.5% (6.1%) in the near-century and 26.7% (42.0%) by the late-century under RCP4.5 (RCP8.5).Our findings suggest that changes in agricultural practices (e.g., fertilization rates) will be key determinants of Maumee Riverdischarge during the 21 st century.
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