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i <br /> ` I <br /> 'be greater than or comparable to increases in nitrate concentrations during high <br /> flows. (See USGS website, Nitrate in the Mississippi River and its tributaries, 1980 <br /> to 20o8.) These findings also suggest that increasing nitrate concentrations in <br /> groundwater are having a substantial effect on nitrate concentrations in rivers and <br /> nitrate transport to the Gulf of Mexico. Because nitrate moves slowly through <br /> groundwater to rivers, the full effect of management strategies designed to reduce <br /> nitrate movement to these rivers may not be seen for many years. <br /> Citation <br /> "Vulnerability of Streams to Legacy Nitrate Sources" <br /> Anthony J. Tesoriero, John H. Duff, David A. Saad, Norman E. Spahr, and David M. <br /> Wolock <br /> Environmental Science &Technology; April 16, 2013 <br /> Learnmore <br /> • USGS Circular 1�50: Nutrients in the Nation's Streams and Groundwater <br /> • Nitrate in the Mississippi River and Its Tributaries, lg8o to 2oo8• Are We <br /> Making Progress? (USGS) <br /> • Article and supplemental material in Environmental Science &Technology <br /> • Nutrient Flux for the Mississippi River Basin and Sub-basins (USGS) <br /> r <br /> 5 <br /> 13 , � g <br />