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A decade of change in the Skidaway River estuary I. Hydrography and nutrients

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Abstract

The Skidaway River estuary is a tidally-dominated subtropical estuary in the southeastern USA surrounded by extensiveSpartina salt marshes. Weekly smapling at high and low tide began in 1986 for hydrography, nutrients, chlorophylla, particulate matter, and microbial and plankton biomass and composition; hydrographic and nutrient data during 1986–1996 are reported here. Salinity varied inversely with river discharge and exhibited variability at all time scales but with no long-term trend. Water temperature typically ranged over 25°C and was without apparent long-term frend. Seasonal cycles in concentrations of NO3, NH4, PO4, Si(OH)4, and DON were observed, with annual maxima generally occurring in late summer. Superimposed on seasonal cycles, all five nutrients exhibited steady increases in minimum, mean, and maximum concentrations; mean concentrations increased c. 50–150% during the decade. Nutrient concentrations were highly correlated with water temperature over the ten-year period, but weakly related to salinity and discharge. Nutrients were strongly correlated with one another, and the relative ratios among inorganic nutrients showed little long-term trend. Correlations among temperature and nutrient concentrations exhibited considerable inter-annual variability. Major spikes in organic and inorganic nutrient concentrations coincided with significant rainfall events; concentrations increased hyperbolically with rainfall. Although pristine compared to more heavily impacted waterways primarily outside the region, residential development and population density have been increasing rapidly during the past 15–20 years. Land use is apparently altering nutrient loading over the long-term (months-years), and superimposed on this are stochastic meteorological events that accelerate these changes over the short term (days-weeks).

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Literature Cited

  • Alber, M. andJ. E. Sheldon. 1999. Use of a date-specific method to examine variability in the flushing times of Georgia estuaries.Estuarine, Coastal and Shelf Science 49:469–482.

    Article  Google Scholar 

  • Allen, A. E., M. G. Booth, M. E. Frischer, P. G. Verity, J. P. Zehr, andS. Zani. 2001. Diversity and detection of nitrate assimilation genes in marine bacteria.Applied and Environmental Microbiology 67:5343–5348.

    Article  CAS  Google Scholar 

  • Berges, J. A., D. J. S. Montagnes, C. L. Hurd, andP. J. Harrison. 1994. Fitting ecological and physiological data to rectangular hyperbolae: A comparison of methods using Monte Carlo simulations.Marine Ecology Progress Series 114:175–183.

    Article  Google Scholar 

  • Bishop, J. J., K. A. Emmanuele, andJ. A. Yoder. 1984. Nutrient limitation of phytoplankton growth in Georgia nearshore waters.Estuaries 7:506–512.

    Article  Google Scholar 

  • Boatright, S. R. andD. C. Bachtel. 2000. The Georgia County Guide, 19th edition. Cooperative Extension Service, University of Georgia, Athens, Georgia.

    Google Scholar 

  • Bronk, D. A., M. W. Lomas, P. M. Glibert, K. J. Schukert, andM. P. Sanderson. 2000. Total dissolved nitrogen analysis: Comparison between the persulfate, UV, and high temperature oxidation methods.Marine Chemistry 69:163–178.

    Article  CAS  Google Scholar 

  • Brush, G. S.. 1984. Stratigraphic evidence of eutrophication in an estuary.Water Resources Research 20:531–541.

    Article  CAS  Google Scholar 

  • Brzezinski, M. A.. 1985. The Si∶C∶N ratio of marine diatoms: Interspecific variability and the effect of some environmental variables.Journal of Phycology 21:347–357.

    Article  CAS  Google Scholar 

  • Carr, A. P. andM. W. L. Blackley. 1986. The effects and implications of tides and rainfall on the circulation of water within salt marsh sediments.Limnology and Oceanography 31:266–276.

    Google Scholar 

  • Casamitjana, X. andE. Roget. 1993. Resuspension of sediment by focused groundwater in Lake Banyoles.Limnology and Oceanography 38:643–656.

    Article  Google Scholar 

  • Coastal Georgia Regional Development Center. 1998. Coastal Georgia Regional Plan. June 1998, Technical report. Brunswick, Georgia.

  • Conley, D. J., P. Stalnacke, H. Pitkanen, andA. Wilander. 2000. The transport and retention of dissolved silicate by rivers in Sweden and Finland.Limnology and Oceanography 45: 1850–1853.

    Article  Google Scholar 

  • Corbett, C. W., M. Wahl, D. E. Porter, D. Edwards, andC. Moise. 1997. Nonpoint source modeling: A comparison of a forested watershed and an urban watershed on the South Carolina coast.Journal of Experimental Marine Biology and Ecology 213:133–149.

    Article  Google Scholar 

  • Cornell, S., A. Rendell, andT. Jickells. 1995. Atmospheric inputs of dissolved organic nitrogen to the oceans.Nature 376: 243–246.

    Article  CAS  Google Scholar 

  • Culliton, T. J., M. A. Warren, T. R. Goodspeed, D. G. Renner, C. M. Blackwell, andJ. J. McDonough, III. 1990. Fifty Years of Population Change along the Nation’s Coast, 1960–2010. National Ocean Service, National Oceanic and Atmospheric Administration, Rockville, Maryland.

    Google Scholar 

  • Dai, T. andR. G. Wiegert. 1996. Ramet population dynamics and net aerial primary productivity ofSpartina alterniflora.Ecology 77:276–288.

    Article  Google Scholar 

  • Dame, R., M. Alber, D. Allen, M. Mallin, C. Montague, A. Lewitus, A. Chalmers, R. Gardner, C. Gilman, B. Kjerfve, J. Pickney, andN. Smith. 2000. Estuaries of the South Atlantic coast of North America: Their geographic signatures.Estuaries 23:793–819.

    Article  CAS  Google Scholar 

  • Dame, R. F., J. D. Spurrier, T. M. Williams, B. Kjerfve, R. G. Zingmark, T. G. Wolaver, T. H. Chrzanowski, H. N. McKellar, andF. J. Vernberg. 1991. Annual material processing by a salt marsh-estuarine basin in South Carolina, USA.Marine Ecology Progress Series 72:153–166.

    Article  Google Scholar 

  • D’Elia, C. F., J. G. Sanders, andW. R. Boynton. 1986. Nutrient enrichment studies of a coastal plain estuary: Phytoplankton growth in large-scale continuous cultures.Canadian Journal of Fisheries and Aquatic Sciences 43:397–406.

    Article  CAS  Google Scholar 

  • DeVoe, M. R. andG. S. Kleppel. 1995. The South Atlantic Bight Land Use—Coastal Ecosystem Study (LU-CES): Conceptual Framework. South Carolina Sea Grant Consortium. Charleston, South Carolina.

    Google Scholar 

  • Doering, P. H., C. A. Oviatt, L. L. Beatty, V. F. Banzon, R. Rice, S. P. Kelly, B. K. Sullivan, andJ. B. Frithsen. 1989. Structure and function in a model coastal ecosystem: Silicon, the benthos, and eutrophication.Marine Ecology Progress Series 52:287–299.

    Article  Google Scholar 

  • Dortch, Q. andT. E. Whitledge. 1992. Does nitrogen or silicon limit phytoplankton production in the Mississippi River plume and nearby regions?Continental Shelf Research 12:1293–1309.

    Article  Google Scholar 

  • Fletcher, M., P. G. Verity, M. E. Frischer, K. A. Maruya, andG. I. Scott. 1998. Microbial Indicators and Phytoplankton and Bacterial Indicators as Evidence of Contamination Caused by Changing Land Use Patterns. LU-CES State of Knowledge Report. South Carolina Sea Grant Consortium. Charleston, South Carolina

    Google Scholar 

  • Gardner, L. R. 1975. Runoff from an intertidal marsh during tidal exposure—Recession curves and chemical characteristics.Limnology and Oceanography 20:81–89.

    CAS  Google Scholar 

  • Glibert, P. M. andT. C. Loder. 1977. Automated Analysis of Nutrients in Seawater: A Manual of Techniques. Woods Hole Oceanographic Institute Technical Report WHOI-77-47. Woods Hole Oceanographic Institute, Woods Hole, Massachusetts.

    Google Scholar 

  • Haines, E. B. 1976. Nitrogen content and acidity of rain on the Georgia coast.Water Resources Bulletin 12:1223–1231.

    CAS  Google Scholar 

  • Haines, E. B. 1979. Nitrogen pools in Georgia coastal waters.Estuaries 2:34–39.

    Article  CAS  Google Scholar 

  • Hallegraeff, G. M. 1993. A review of harmful algal blooms and their apparent global increase.Phycologia 32:79–99.

    Google Scholar 

  • Hicks, B. B., R. A. Valigura, andF. B. Courtright. 2000. The role of the atmosphere in coastal ecosystem decline—Future research directions.Estuaries 23:854–863.

    Article  CAS  Google Scholar 

  • Hobbie, J. E. andJ. J. Cole. 1984. Response of a detrital foodweb to eutrophication.Bulletin of Marine Science 35:357–363.

    Google Scholar 

  • Hopkinson, Jr.,C. S. andJ. J. Vallino. 1995. The relationship among man’s activities in watersheds and estuaries: A model of runoff effects on patterns of estuatine community metabolism.Estuaries 18:598–621.

    Article  CAS  Google Scholar 

  • Hubertz, E. D. andL. B. Cahoon. 1999. Short-term variability of water quality parameters in two shallow estuaries of North Carolina.Estuaries 22:814–823.

    Article  CAS  Google Scholar 

  • Humborg, C., D. J. Conley, L. Rahm, F. Wulff, A. Cociasu, andV. Ittekkot. 2000. Silicate retention in river basins: Far-reaching effects on biogeochemistry and aquatic food webs in coastal marine environments.Ambio 29:45–50.

    Article  Google Scholar 

  • Imberger, J., T. Berman, R. R. Christian, E. B. Sherr, D. E. Whitney, L. R. Pomeroy, R. G. Wiegert, andW. J. Wiebe. 1983. The influence of water motion on the distribution and transport of materials in a salt marsh estuary.Limnology and Oceanography 28:201–214.

    Google Scholar 

  • Irwin, T. T., D. M. Bay, andL. E. Snipes. 1994. Georgia Agricultural Facts Book. Georgia Agricultural Statistics Service, Athens, Georgia.

    Google Scholar 

  • Justic, D., N. N. Rabalais, andR. E. Turner. 1995. Stoichiometric nutrient balance and origin of coastal eutrophication.Marine Pollution Bulletin 30:41–46.

    Article  CAS  Google Scholar 

  • Krest, J. M., W. S. Moore, L. R. Gardner, andJ. T. Morris. 2000. Marsh nutrient export controlled by groundwater discharge: Evidence from radium measurements.Global Biogeochemical Cycles 14:167–176.

    Article  CAS  Google Scholar 

  • Lovett, G. M. 1994. Atmospheric deposition of nutrients and pollutants in North America: An ecological perspective.Ecological Applications 4:629–650.

    Article  Google Scholar 

  • Mallin, M. A., J. M. Burkholder, L. B. Cahoon, andM. H. Posey. 2000. North and South Carolina coasts.Marine Pollution Bulletin 41:56–75.

    Article  CAS  Google Scholar 

  • McCollister, T. 1993. Golf in Georgia. Longstreet Press, Atlanta, Georgia.

    Google Scholar 

  • Metropolitan Planning Commission. 2000. Chatham County Population Records. Georgia government report. Savannah, Georgia.

  • Millham, N. P. andB. L. Howes. 1994a. Freshwater flow into a coastal embayment: Groundwater and surface water inputs.Limnology and Oceanography 39:1928–1944.

    Article  Google Scholar 

  • Millham, N. P. andB. L. Howes. 1994b. Nutrient balance of a shallow coastal embayment. I. Patterns of groundwater discharge.Marine Ecology Progress Series 112:155–167.

    Article  CAS  Google Scholar 

  • Moore, W. S. 1996. Large groundwater inputs to coastal waters revealed by 226Ra enrichments.Nature 380:612–614.

    Article  CAS  Google Scholar 

  • Moore, W. S. andT. J. Shaw. 1998. Chemical signals from subterranean fluid advection onto the continental shelf.Journal of Geophysical Research 103:21543–21552.

    Article  CAS  Google Scholar 

  • Moore, W. S. 1999. The subterranean estuary: A reaction zone of ground water and sea water.Marine Chemistry 65:111–125.

    Article  CAS  Google Scholar 

  • Morris, J. T. 2000. Effects of sea-level anomalies on estuarine processes, p. 107–127.In J. E. Hobbie (ed.) Estuarine Science, A Synthetic Approach to Research and Practice. Island Press, Washington, D.C.

    Google Scholar 

  • Nixon, S. W. 1995. Coastal marine eutrophication: A definition, social causes, and future concerns.Ophelia 41:199–219.

    Google Scholar 

  • Nixon, S. W. 1997. Prenistoric nutrient inputs and productivity in Narragansett Bay.Estuaries 20:253–261.

    Article  CAS  Google Scholar 

  • National Oceanic and Atmospheric Administration (NOAA). 1991. The National Shellfish Register of Classified Estuarine Waters. Ocean Resources, Conservation and Assessment, Strategic Planning Division, Silver Springs Maryland.

    Google Scholar 

  • National Oceanic and Atmosphreic Administration (NOAA). 1996. Estuarine Eutrophication Survey, Volume 1. South Atlantic Region. Office of Ocean Resources Conservation Assessment, Silver Spring, Maryland.

    Google Scholar 

  • National Oceanic and Atmospheric Administration (NOAA). 2000. Climatological Data, Georgia, April 2000, Volume 104. National Climate Data Center, Asheville, North Carolina.

    Google Scholar 

  • Norris, A. R. andC. T. Hackney. 1999. Silica content of a mesohaline tidal marsh in North Carolina.Estuarine, Coastal and Shelf Science 49:597–605.

    Article  CAS  Google Scholar 

  • Nuttle, W. K. andJ. W. Portnoy. 1992. Effect of rising sea level on runoff and groundwater discharge to coastal ecosystems.Estuarine, Coastal and Shelf Science 34:203–212.

    Article  Google Scholar 

  • Officer, C. B., R. B. Biggs, J. L. Taft, L. E. Cronin, M. Tyler, andW. R. Boynton. 1984. Chesapeake Bay anoxia: Origin, development, and significance.Science 223:22–27.

    Article  CAS  Google Scholar 

  • Oviatt, C. A., A. A. Keller, P. A. Sampou, andL. L. Beatty. 1986. Patterns of productivity during eutrophication: A mesocosm experiment.Marine Ecology Progress Series 28:69–80.

    Article  Google Scholar 

  • Paerl, H. 1997. Coastal eutrophication and harmful algal blooms: Importance of atmospheric deposition and groundwater as “new” nitrogen and other nutrient sources.Limnology and Oceanography 42:1154–1165.

    Article  CAS  Google Scholar 

  • Park, D. A. 1979. Groundwater in the Coastal Plains Region: A Status Handbook. Coastal Plains Commission Grant No. 10-740-005. CPRC, Charleston, South Carolina.

    Google Scholar 

  • Peierls, B. L., N. F. Caraco, M. L. Pace, andJ. J. Cole. 1991. Human influence on river nitrogen.Nature 350:386–387.

    Article  Google Scholar 

  • Pryor, S. C. andR. J. Barthelmie. 2000. Particle dry deposition to water surfaces: Processes and consequences.Marine Pollution Bulletin 41:220–231.

    Article  CAS  Google Scholar 

  • Reay, W. G., D. L. Gallagher, andG. M. Simmons, Jr. 1992. Groundwater discharge and its impact on surface water quality in a Chesapeake Bay inlet.Water Resources Bulletin 28:1121–1134.

    Google Scholar 

  • Scudlark, J. R., K. M. Russell, J. N. Galloway, T. M. Church, andW. C. Keene. 1998. Organic nitrogen in precipitation at the mid-Atlantic U.S. coast—Methods evaluation and prelimiinary measurements.Atmospheric Environment 32:1719–1728.

    Article  CAS  Google Scholar 

  • Seitzinger, S. P. andR. W. Sanders. 1999. Atmospheric inputs of dissolved organic nitrogen stimulate estuarine bacteria and phytoplankton.Limnology and Oceanography 44:721–730.

    Article  CAS  Google Scholar 

  • Simmons, Jr.,G. M. 1992. Importance of submarine groundwater discharge (SGWD) and seawater cycling to material flux across sediment/water interfaces in marine environments.Marine Ecology Progress Series 84:173–184.

    Article  CAS  Google Scholar 

  • Sin, Y., R. L. Wetzel, andI. C. Anderson. 1999. Spatial and temporal characteristics of nutrient and phytoplankton dynamics in the York River estuary, Virginia: Analysis of long-term data.Estuaries 22:260–275.

    Article  Google Scholar 

  • Smayda, T. J. 1990. Novel and nuisance phytoplankton blooms in the sea: Evidence for a global epidemic, p. 29–40.In E. Granéli, B. Sunderström, L. Edler, and D. M. Anderson (eds.), Toxic Marine Phytoplankton. Elsevier, New York.

    Google Scholar 

  • Smith, R. A., R. B. Alexander, andM. G. Wolman. 1987. Water quality trends in the nation’s rivers.Science 235:1607–1615.

    Article  CAS  Google Scholar 

  • Solarzano, L. andJ. H. Sharp. 1980. Determination of total dissolved nitrogen in natural waters.Limnology and Oceanography 25:751–754.

    Article  Google Scholar 

  • Stepanauskas, R., H. Edling, andL. J. Tranvik. 1999. Differential dissolved organic nitrogen availability and bacterial aminopepside activity in limnic and marine waters.Microbial Ecology 38:264–272.

    Article  CAS  Google Scholar 

  • Stokes, III,W. R. andR. D. MacFarlane. 1996. Water Resources Data. Georgia, Water Year 1996. Water-Data Report, GA-96-1. U.S. Department of Interior, U.S. Geological Survey, Doraville, Georgia.

    Google Scholar 

  • Suzumura, M., S. Ueda, andE. Sumi. 2000. Control of phosphate concentration through adsorption and desorption processes in groundwater and seawater mixing at sandy beaches in Tokyo Bay, Japan.Journal of Oceanography 56:667–673.

    Article  CAS  Google Scholar 

  • Turner, R. E. andN. N. Rabalais. 1991. Changes in Mississippi River water quality this century.Bioscience 41:140–147.

    Article  Google Scholar 

  • Valderrama, J. C. 1981. The simultaneous analysis of total nitrogen and total phosphorus in natural waters.Marine Chemistry 10:109–122.

    Article  CAS  Google Scholar 

  • Valiela, I., J. M. Teal, S. Volkman, D. Schafer, andE. J. Carpenter. 1978. Nutrient and particulate fluxes in a salt marsh ecosystem: Tidal exchange and inputs by precipitation and groundwater.Limnology and Oceanography 23:798–812.

    CAS  Google Scholar 

  • Valiela, I. andJ. Costa. 1988. Eutrophication of Buttermilk Bay, a Cape Cod coastal embayment: Concentrations of nutrients and watershed nutrient budgets.Environmental Management 12:539–553.

    Article  CAS  Google Scholar 

  • Valiela, I., J. Costa, K. Foreman, J. M. Teal, B. Howes, andD. Aubrey. 1990. Transport of groundwater-borne nutrients from watersheds and their effects on coastal waters.Biogeochemistry 10:177–197.

    Article  CAS  Google Scholar 

  • Verity, P. G., J. A. Yoder, S. S. Bishop, J. R. Nelson, D. B. Craven, J. O. Blanton, C. Y. Robertson, andC. R. Tronzo. 1993. Composition, productivity, and nutrient chemistry of a coastal ocean planktonic food web.Continental Shelf Research 13:741–776.

    Article  Google Scholar 

  • Vernberg, F. J., W. B. Vernberg, E. Blood, A. Fortner, M. Fulton, H. McKellar, W. Michener, G. Scott, T. Siewicki, andK. El-Figi. 1992. Impact of urbanization on high-salinity estuaries in southeastern United States.Netherlands Journal of Sea Research 30:239–248.

    Article  Google Scholar 

  • Wahl, M. H., H. N. McKellar, andT. M. Williams. 1997. Patterns of nutrient loading in forested and urban coastal streams.Journal of Experimental Marine Biology and Ecology 213: 111–131.

    Article  CAS  Google Scholar 

  • Whiting, G. J., H. N. McKellar, Jr.,B. J. Kjerve, andJ. D. Spurrier. 1987. Nitrogen exchange between a southeastern U.S.A. salt marsh ecosystem and the coastal ocean.Marine Biology 95:173–182.

    Article  CAS  Google Scholar 

  • Whiting, G. J. andD. L. Childers. 1989. Subtidal advective water flux as a potentially important nutrient input to southeastern USA saltmarsh estuaries.Estuarine, Coastal and Shelf Science 28:417–431.

    Article  CAS  Google Scholar 

  • Whiting, G. J., H. N. McKellar, Jr.,J. D. Spurrier, andT. G. Wolaver. 1989. Nitrogen exchange between a portion of vegetated salt marsh and the adjoining creek.Limnology and Oceanography 34:463–473.

    Google Scholar 

  • Windom, H. L., J. O. Blanton, P. G. Verity, andR. Jahnke. 1993. Oceanographic response to environmental change, p. 75–91.In D. W. Menzel (ed.), Ocean Processes: U.S. Southeast Continental Shelf. U.S. DOF Office of Scientific and Technical Information, Report DE93010744. National Technical Information Service, Springfield, Virginia.

    Google Scholar 

  • Wolaver, T. G. andJ. D. Spurrier. 1988. Carbon transport between a euhaline vegetated marsh in South Carolina and the adjacent tidal creek: Contributions via tidal inundation, rundoff and seepage.Marine Ecology Progress Series 42:53–62.

    Article  Google Scholar 

  • Yoder, J. A. 1985. Environmental control of phytoplankton production on the southeastern U.S. continental shelf, p. 93–103.In L. P. Atkinson, D. W. Menzel, and K. A. Bush (eds.) Oceanography of the Southeastern U.S. Continental Shelf. Coastal and Estuarine Science, Volume 2. American Geophysical Union, Washington D.C.

    Google Scholar 

Source of Unpublished Materials

  • Bronk, Deborah, personal communication. Virginia Institute of Marine Science, Gloucester Point, Virginia 23062.

  • Chalmers, Alice, personal communication. University of Georgia, Athens, Georgia 30602.

  • Jahnke, Richard. personal communication. Skidaway Institute of Oceanography, Savannah, Georgia 31411.

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    Peter G. Verity

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Verity, P.G. A decade of change in the Skidaway River estuary I. Hydrography and nutrients. Estuaries 25, 944–960 (2002). https://doi.org/10.1007/BF02691343

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