Bohlke, J. K., Wanty, R., Tuttle, M., Delin, G., and Landon, M.: Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota, Water Resour. Res., 38, 1105–1130, https://doi.org/110510.1029/2001wr000663, 2002.
Bonn, M. A.: Visitor profiles, economic impacts and recreational aesthetic values associated with eight priority Florida springs located in the St. Johns River Water Management District, St. Johns River Water Management District, Palatka, FL, 136 pp., 2004.
Bonn, M. A. and Bell, F. W.: Economic impact of selected Florida springs on surrounding local areas., Florida Department of Environmental Protection, Tallahassee, Florida, USA, 99 pp., 2003.
Burgin, A. J. and Hamilton, S. K.: Have we overemphasized the role of denitrification in aquatic ecosystems? A review of nitrate removal pathways, Front. Ecol. Environ., 5, 89–96, 2007.
Burns, D. A., Boyer, E. W., Elliott, E. M., and Kendall, C.: Sources and transformations of nitrate from streams draining varying land uses: Evidence from dual isotope analysis, J. Environ. Qual., 38, 1149–1159, https://doi.org/10.2134/jeq2008.0371, 2009.
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Bohlke, J. K., and Hilkert, A.: Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method, Anal. Chem., 74, 4905–4912, https://doi.org/10.1021/ac020113w, 2002.
Castro, M. C., Hall, C. M., Patriarche, D., Goblet, P., and Ellis, B. R.: A new noble gas paleoclimate record in Texas – basic assumptions revisited, Earth Planet. Sc. Lett., 257, 170–187, https://doi.org/10.1016/j.epsl.2007.02.030, 2007.
Cey, B. D., Hudson, G. B., Moran, J. E., and Scanlon, B. R.: Evaluation of noble gas recharge temperatures in a shallow unconfined aquifer, Ground Water, 47, 646–659, https://doi.org/10.1111/j.1745-6584.2009.00562.x, 2009.
Chapelle, F. H., McMahon, P. B., Dubrovsky, N. M., Fujii, R. F., Oaksford, E. T., and Vroblesky, D. A.: Deducing the distribution of terminal electron-accepting processes in hydrologically diverse groundwater systems, Water Resour. Res., 31, 359–371, https://doi.org/10.1029/94wr02525, 1995.
Cohen, M. J., Heffernan, J. B., Albertin, A. A., and Martin, J. B.: Inference of riverine nitrogen processing from longitudinal and diel variation in dual nitrate isotopes, J. Geophys. Res.-Biogeosci., 117, G01021, https://doi.org/10.1029/2011JG001715, 2012.
Dahm, C. N., Grimm, N. B., Marmonier, P., Valett, H. M., and Vervier, P.: Nutrient dynamics at the interface between surface waters and groundwaters, Freshwater Biol., 40, 427–451, 1998.
David, M. B., Wall, L. G., Royer, T. V., and Tank, J. L.: Denitrification and the nitrogen budget of a reservoir in an agricultural landscape, Ecol. Appl., 16, 2177–2190, 2006.
Dederkorkut, A.: Suwanee River Partnership: Representation instead of regulation, in: Adaptive Governance and Water Conflict: New Institutions for Collaborative Planning, edited by: Scholz, J. and Stiftel, B., Resources for the Future Press, Washington, DC, 25–39, 2005.
Duarte, C. M., Prairie, Y. T., Frazer, T. K., Hoyer, M. V., Notestein, S. K., Martínez, R., Dorsett, A., and Canfield, D. E.: Rapid accretion of dissolved organic carbon in the springs of Florida: the most organic-poor natural waters, Biogeosciences, 7, 4051–4057, https://doi.org/10.5194/bg-7-4051-2010, 2010.
Einsiedl, F. and Mayer, B.: Hydrodynamic and microbial processes controlling nitrate in a fissured-porous karst aquifer of the Franconian Alb, southern Germany, Environ. Sci. Technol., 40, 6697–6702, https://doi.org/10.1021/es061129x, 2006.
Eyre, B. D., Rysgaard, S., Dalsgaard, T., and Christensen, P. B.: Comparison of isotope pairing and N-2: Ar methods for measuring sediment-denitrification-assumptions, modifications, and implications, Estuaries, 25, 1077–1087, 2002.
Feast, N. A., Hiscock, K. M., Dennis, P. F., and Andrews, J. N.: Nitrogen isotope hydrochemistry and denitrification within the chalk aquifer system of North Norfolk, UK, J. Hydrol., 211, 233–252, 1998.
Fogg, G. E., Rolston, D. E., Decker, D. L., Louie, D. T., and Grismer, M. E.: Spatial variation in nitrogen isotope values beneath nitrate contamination sources, Ground Water, 36, 418–426, 1998.
Galloway, J. N., Aber, J. D., Erisman, J. W., Seitzinger, S. P., Howarth, R. W., Cowling, E. B., and Cosby, B. J.: The nitrogen cascade, Bioscience, 53, 341–356, 2003.
Granger, J., Sigman, D. M., Lehmann, M. F., and Tortell, P. D.: Nitrogen and oxygen isotope fractionation during dissimilatory nitrate reduction by denitrifying bacteria, Limnol. Oceanogr., 53, 2533–2545, 2008.
Green, C. T., Puckett, L. J., Bohlke, J. K., Bekins, B. A., Phillips, S. P., Kauffman, L. J., Denver, J. M., and Johnson, H. M.: Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States, J. Environ. Qual., 37, 994–1009, https://doi.org/10.2134/jeq2006.0419, 2008.
Green, C. T., Bohlke, J. K., Bekins, B. A., and Phillips, S. P.: Mixing effects on apparent reaction rates and isotope fractionation during denitrification in a heterogeneous aquifer, Water Resourc. Res., 46, W08525, https://doi.org/10.1029/2009wr008903, 2010.
Groffman, P. M., Butterbach-Bahl, K., Fulweiler, R. W., Gold, A. J., Morse, J. L., Stander, E. K., Tague, C., Tonitto, C., and Vidon, P.: Challenges to incorporating spatially and temporally explicit phenomena (hotspots and hot moments) in denitrification models, Biogeochemistry, 93, 49–77, https://doi.org/10.1007/s10533-008-9277-5, 2009.
Gulley, J., Martin, J. B., Screaton, E. J., and Moore, P. J.: River reversals into karst springs: A model for cave enlargement in eogenetic karst aquifers, Geol. Soc. Am. Bull., 123, 457–467, https://doi.org/10.1130/b30254.1, 2011.
Hackley, K. C., Panno, S. V., Hwang, H. H., and Kelly, W. R.: Groundwater quality of springs and wells of the sinkhole plain in Southwestern Illinois: Determination of the dominant sources of nitrate, Illinois Geological Survey, Circular, 570, 2007.
Hall, C. M., Castro, M. C., Lohmann, K. C., and Ma, L.: Noble gases and stable isotopes in a shallow aquifer in southern Michigan: Implications for noble gas paleotemperature reconstructions for cool climates, Geophys. Res. Lett., 32, 4, L18404, https://doi.org/10.1029/2005gl023582, 2005.
Hamme, R. C. and Emerson, S. R.: The solubility of neon, nitrogen and argon in distilled water and seawater, Deep-Sea Research Part I-Oceanographic Research Papers, 51, 1517–1528, https://doi.org/10.1016/j.dsr.2004.06.009, 2004.
Harms, T. K. and Grimm, N. B.: Hot spots and hot moments of carbon and nitrogen dynamics in a semiarid riparian zone, J. Geophys. Res.-Biogeo., 113, G01020, 2008.
Harrington, D., Maddox, G., and Hicks, R.: Florida springs initiative monitoring network report and recognized sources of nitrate, Florida Department of Environmental Protection, Tallahassee, FL, 103, 2010.
Hedin, L. O., von Fischer, J. C., Ostrom, N. E., Kennedy, B. P., Brown, M. G., and Robertson, G. P.: Thermodynamic constraints on nitrogen transformations and other biogeochemical processes at soil-stream interfaces, Ecology, 79, 684–703, 1998.
Heffernan, J. B., Cohen, M. J., Frazer, T. K., Thomas, R., Rayfield, T., Gulley, J., Martin J. B., Delfino, J. J., and Graham, W. D.: Hydrologic and biotic influences on nitrate removal in a subtropical spring-fed river, Limnol. Oceanogr., 55, 249–263, 2010a.
Heffernan, J. B., Liebowitz, D. L., Frazer, T. K., Evans, J. M., and Cohen, M. J.: Algal blooms and the nitrogen-enrichment hypothesis in Florida springs: Evidence, alternatives, and adaptive management, Ecol. Appl., 20, 816–829, 2010b.
Kana, T. M., Darkangelo, C., Hunt, M. D., Oldham, J. B., Bennett, G. E., and Cornwell, J. C.: Membrane inlet mass-spectrometer for rapid high-precision determination of N-2, O-2, and Ar in environmental water samples, Anal. Chem., 66, 4166–4170, 1994.
Katz, B. G.: Sources of nitrate contamination and age of water in large karstic springs of Florida, Environ. Geol., 46, 689–706, 2004.
Katz, B. G., Bohlke, J. K., and Hornsby, H. D.: Timescales for nitrate contamination of spring waters, northern Florida, USA, Chem. Geol., 179, 167–186, 2001.
Katz, B. G., Chelette, A. R., and Pratt, T. R.: Use of chemical and isotopic tracers to assess nitrate contamination and ground-water age, Woodville Karst Plain, USA, J. Hydrol., 289, 36–61, https://doi.org/10.1016/j.hydrol.2003.11.001, 2004.
Katz, B. G., Sepulveda, A. A., and Verdi, R. J.: Estimating nitrogen loading to ground water and assessing vulnerability to nitrate contamination in a large karstic springs basin, Florida, J. Am. Water Resour. As., 45, 607–627, https://doi.org/10.1111/j.1752-1688.2009.00309.x, 2009.
Kendall, C.: Tracing nitrogen sources and cycling in catchments, in: Isotope tracers in catchment hydrology, edited by: Kendall, C., and McDonnell, J. J., Elsevier Science B.V., Amsterdam, The Netherlands, 1998.
Kendall, C. and Grim, E.: Combustion tube method for measurement of nitrogen isotope ratios using calcium-oxide for total removal of carbon-dioxide and water, Anal. Chem., 62, 526–529, 1990.
Kendall, C., Elliott, E. M., and Wankel, S. D.: Tracing anthropogenic inputs of nitrogen to ecosystems, in: Stable isotopes in ecology and environmental science, edited by: Michener, R. H. and Lajtha, K., Wiley – Blackwell Publishing, Malden, MA, 375–449, 2007.
Kincaid, T. R., Hazlett, T. J., and Davies, G. J.: Quantitative groundwater tracing and effective numerical modeling in karst: an example from the Woodville Karst Plain of North Florida, in: Sinkholes and the Engineering and Environmental Impacts of Karst: Reston, VA, edited by: Beck, B. F., American Society of Civil Engineers, 114–121, 2005.
Knoller, K., Vogt, C., Haupt, M., Feisthauer, S., and Richnow, H. H.: Experimental investigation of nitrogen and oxygen isotope fractionation in nitrate and nitrite during denitrification, Biogeochemistry, 103, 371–384, https://doi.org/10.1007/s10533-010-9483-9, 2011.
Knowles, L., Katz, B. G., and Toth, D. J.: Using multiple chemical indicators to characterize and determine the age of groundwater from selected vents of the Silver Springs group, central Florida, USA, Hydrogeol. J., 18, 1825–1838, https://doi.org/10.1007/s10040-010-0669-y, 2010.
Lehmann, M. F., Reichert, P., Bernasconi, S. M., Barbieri, A., and McKenzie, J. A.: Modelling nitrogen and oxygen isotope fractionation during denitrification in a lacustrine redox-transition zone, Geochim. Cosmochim. Ac., 67, 2529–2542, https://doi.org/10.1016/s0016-7037(03)00085-1, 2003.
Loper, D., Landing, W., Pollman, C. , and Chan Hilton, A.: Degradation of water quality at Wakulla Springs, FL: Assessment and recommendations, Report of the Peer Review Committee on the Workshop Solving Water Pollution Problems in the Wakulla Springshed of North Florida. Florida Department of Environmental Protection, Tallahassee, FL, 70 pp., 2005.
Mariotti, A.: Denitrification in groundwaters, principles and methods for its identification – a review, J. Hydrol., 88, 1–23, 1986.
Mattson, R. A., Lowe, E. F., Lippincott, C. L., Di, J., and Battoe, L.: Wekiva River and Rock Springs Run Pollutant Load Reduction Goals, Florida Department of Environmental Protection, Tallahassee, FL, 69 pp., 2006.
McCallum, J. E., Ryan, M. C., Mayer, B., and Rodvang, S. J.: Mixing-induced groundwater denitrification beneath a manured field in southern Alberta, Canada, Appl. Geochem., 23, 2146–2155, https://doi.org/10.1016/j.apgeochem.2008.03.018, 2008.
McMahon, P. B.: Aquifer/aquitard interfaces: Mixing zones that enhance biogeochemical reactions, Hydrogeol. J., 9, 34–43, https://doi.org/10.1007/s100400000109, 2001.
McMahon, P. B. and Bolke, J. K.: Regional patterns in the isotopic composition of natural and anthropogenic nitrate in groundwater, high plains, USA, Environ. Sc. Technol., 40, 2965–2970, https://doi.org/10.1021/es052229q, 2006.
Miller, J. A.: Ground water atlas of the United States; Alabama, Florida, Georgia, and South Carolina., Hydrologic atlas, U.S. Geological Survey, HA730-G, 1990.
Notholt, A. J. G., Sheldon, R. P., and Davidson, D. F.: North America and Greenland-introduction, in: Phosphate deposits of the world; Volume 2-Phosphate rock resources: Cambridge, edited by: Notholt, A. J. G., Sheldon, R. P., and Davidson, D. F., Cambridge University Press, 90–94, 1989.
Panno, S. V., Hackley, K. C., Hwang, H. H., and Kelly, W. R.: Determination of the sources of nitrate contamination in karst springs using isotopic and chemical indicators, Chem. Geol., 179, 113–128, 2001.
Schlesinger, W. H.: On the fate of anthropogenic nitrogen, Proceedings of the National Academy of Sciences of the United States of America, 106, 203–208, https://doi.org/10.1073/pnas.0810193105, 2009.
Schmidt, N., Lipp, E. K., Rose, J. B., and Luther, M. E.: Enso influences on seasonal rainfall and river discharge in Florida, Journal of Climate, 14, 615–628, https://doi.org/10.1175/1520-0442(2001)014<0615:eiosra>2.0.co;2, 2001.
Schwientek, M., Einsiedl, F., Stichler, W., Stogbauer, A., Strauss, H., and Maloszewski, P.: Evidence for denitrification regulated by pyrite oxidation in a heterogeneous porous groundwater system, Chem. Geol., 255, 60–67, https://doi.org/10.1016/j.chemgeo.2008.06.005, 2008.
Scott, T. M., Means, G. H., Meegan, R. P., Means, R. C., Upchurch, S. B., Copeland, R. E., Jones, J., Roberts, T., and Willet, A.: Springs of Florida, Florida Geological Survey Bulletin 66, Tallahassee, FL, 347 pp., 2004.
Sebilo, M., Billen, G., Grably, M., and Mariotti, A.: Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system, Biogeochemistry, 63, 35–51, 2003.
Seitzinger, S., Harrison, J. A., Bohlke, J. K., Bouwman, A. F., Lowrance, R., Peterson, B., Tobias, C., and Van Drecht, G.: Denitrification across landscapes and waterscapes: A synthesis, Ecol. Appl., 16, 2064–2090, 2006.
Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M., and Bohlke, J. K.: A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater, Anal. Chem., 73, 4145–4153, 2001.
Sigman, D. M., Granger, J., DiFiore, P. J., Lehmann, M. M., Ho, R., Cane, G., and van Geen, A.: Coupled nitrogen and oxygen isotope measurements of nitrate along the eastern North Pacific margin, Global Biogeochem. Cy., 19, GB4022, https://doi.org/10.1029/2005gb002458, 2005.
Sigman, D. M., DiFiore, P. J., Hain, M. P., Deutsch, C., Wang, Y., Karl, D. M., Knapp, A. N., Lehmann, M. F., and Pantoja, S.: The dual isotopes of deep nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen, Deep-Sea Res. Pt. I, 56, 1419–1439, https://doi.org/10.1016/j.dsr.2009.04.007, 2009.
Smith, V. H. and Schindler, D. W.: Eutrophication science: Where do we go from here?, Trends Ecol. Evol., 24, 201–207, https://doi.org/10.1016/j.tree.2008.11.009, 2009.
Tarits, C., Aquilina, L., Ayraud, V., Pauwels, H., Davy, P., Touchard, F., and Bour, O.: Oxido-reduction sequence related to flux variations of groundwater from a fractured basement aquifer (Ploemeur area, France), Appl. Geochem., 21, 29–47, https://doi.org/10.1016/j.apgeochem.2005.09.004, 2006.
Taylor, P. G. and Townsend, A. R.: Stoichiometric control of organic carbon-nitrate relationships from soils to the sea, Nature, 464, 1178–1181, https://doi.org/10.1038/nature08985, 2010.
Tihansky, A. B. and Sacks, L. A.: Evaluation of nitrate sources using nitrogen-isotope techniques in shallow ground water within selected lake basins in the Central Lakes District, Polk and Highlands Counties, Florida, US Geological Survey, Reston, VA, Water-Resources Investigations Report 97-4207, 1997.
Torrento, C., Cama, J., Urmeneta, J., Otero, N., and Soler, A.: Denitrification of groundwater with pyrite and thiobacillus denitrificans, Chem. Geol., 278, 80–91, https://doi.org/10.1016/j.chemgeo.2010.09.003, 2010.
Torrento, C., Urmeneta, J., Otero, N., Soler, A., Vinas, M., and Cama, J.: Enhanced denitrification in groundwater and sediments from a nitrate-contaminated aquifer after addition of pyrite, Chem. Geol., 287, 90–101, https://doi.org/10.1016/j.chemgeo.2011.06.002, 2011.
Toth, D. J. and Katz, B. G.: Mixing of shallow and deep groundwater as indicated by the chemistry and age of karstic springs, Hydrogeol. J., 14, 827–847, https://doi.org/10.1007/s10040-005-0478-x, 2006.
Upchurch, S. B., Chen, J., and Cain, C. R.: Trends of nitrate concentrations in waters of thesuwannee river water management district, 2007, Suwannee River Water Management District, Live Oak, FL, 2007.
USGS (US Geological Survey): Nutrients in the Upper Mississippi River: Scientific information to support management decisions, USGS Fact Sheet 6, 2003.
Vitousek, P. M.: Beyond global warming – ecology and global change, Ecology, 75, 1861–1876, 1994.
Vogel, J. C., Talma, A. S., and Heaton, T. H. E.: Gaseous nitrogen as evidence for denitrification in groundwater, J. Hydrol., 50, 191–200, https://doi.org/10.1016/0022-1694(81)90069-x, 1981.
Wicks, C. M. and Herman, J. S.: The effect of a confining unit on the geochemical evolution of groundwater in the Upper Floridan Aquifer system, J. Hydrol., 153, 139–155, https://doi.org/10.1016/0022-1694(94)90189-9, 1994.
Wilson, G. B. and McNeill, G. W.: Noble gas recharge temperatures and the excess air component, Appl. Geochem., 12, 747–762, https://doi.org/10.1016/s0883-2927(97)00035-8, 1997.
Zhang, Y. C., Slomp, C. P., Broers, H. P., Passier, H. F., and Van Cappellen, P.: Denitrification coupled to pyrite oxidation and changes in groundwater quality in a shallow sandy aquifer, Geochim. Cosmochim. Ac., 73, 6716–6726, https://doi.org/10.1016/j.gca.2009.08.026, 2009.