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Abstract
Widespread use of septic tanks in the Florida Keys increase the nutrient concentrations of limestone groundwaters that discharge into shallow nearshore waters, resulting in coastal eutrophication. This study characterizes watershed nutrient inputs, transformations, and effects along a land-sea gradient stratified into four ecosystems that occur with increasing distance from land: manmade canal systems (receiving waters of nutrient inputs), seagrass meadows, patch reefs, and offshore bank reefs. Soluble reactive phosphorus (SRP), the primary limiting nutrient, was significantly elevated in canal systems compared to the other ecosystems, while dissolved inorganic nitrogen (DIN; NH4+ and NO3−) a secondary limiting nutrient, was elevated both in canal systems and seagrass meadows. SRP and NH4+ concentrations decreased to low concentrations within approximately 1 km and 3 km from land, respectively. DIN and SRP accounted for their greatest contribution (up to 30%) of total N and P pools in canals, compared to dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) that dominated (up to 68%) the total N and P pools at the offshore bank reefs. Particulate N and P fractions were also elevated (up to 48%) in canals and nearshore seagrass meadows, indicating rapid biological uptake of DIN and SRP into organic particles. Chlorophylla and turbidity were also elevated in canal systems and seagrass meadows; chlorophylla was maximal during summer when maximum watershed nutrient input occurs, whereas turbidity was maximal during winter due to seasonally maximum wind conditions and sediment resuspension. DO was negatively correlated with NH4+ and SRP; hypoxia (DO<2.5 mg l−1) frequently occurred in nutrient-enriched canal systems and seagrass meadows, especially during the warm summer months. These findings correlate with recent (<5 years) observations of increasing algal blooms, seagrass epiphytization and die-off, and loss of coral cover on patch and bank reef ecosystems, suggesting that nearshore waters of the Florida Keys have entered a stage of critical eutrophication.
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Literature Cited
Belanger, T. V., D. S. Scheidt, andJ. R. Platko. 1989. Effects of nutrient enrichment on the Florida Everglades.Lake and Reservoir Management 5:101–111.
Birkeland, C. 1977. The importance of rate of biomass accumulation in early successional stages of benthic communities to the survival of coral recruits, p. 15–21.In D. Taylor (ed.), Proceedings of the Third International Coral Reef Symposium 1. Biology. University of Miami Rosenstiel School of Marine and Atmospheric Sciences, Miami, Florida.
Birkeland, C. 1987. Nutrient availability as a major determinant of differences among coastal hard-substratum communities in different regions of the tropics.In C. Birkeland (ed.), Comparison Between Atlantic and Pacific Tropical Marine Coastal Ecosystems: Community Structure, Ecological Processes, and Productivity.UNESCO Reports in Marine Science 46:45–97.
Birkeland, C. 1988. Second order ecological effects of nutrient input to coral communities.Galaxea 7:91–100.
Borum, J. 1985. Development of epiphytic communities on eelgrass (Zostera marina) along a nutrient gradient in a Danish estuary.Marine Biology 87:211–218.
Burnison, B. K. 1979. Modified dimethyl sulfoxide (DMSO) extraction for chlorophyll analysis of phytoplankton.Canadian Journal of Fisheries and Aquatic Science 37:729–733.
Cambridge, M. L. andA. J. McComb. 1984. The loss of seagrasses in Cockburn Sound, Western Australia. I. The time course and magnitude of seagrass decline in relation to industrial development.Aquatic Botany 20:229–243.
Capone, D. G. andM. F. Bautista. 1985. A groundwater source of nitrate in nearshore sediments.Nature 313:214–216.
Capone, D.. 1988. Benthic nitrogen fixation, p. 85–123.In T. H. Blackburn and J. Sorensen (eds.), Nitrogen Cycling in Coastal Environments. John Wiley and Sons, New York.
DeKanel, J. andJ. W. Morse. 1978. The chemistry of orthophosphate uptake from seawater onto calcite and aragonite.Geochimica et Cosmochimica Acta 42:1335–1340.
D’Elia, C. F., P. A. Steudler, andN. Corwin. 1977. Determination of total N in aqueous samples using persulfate digestion.Limnology and Oceanography 22:760–764.
Doremus, C. 1982. Geochemical control of dinitrogen fixation in the open ocean.Biological Oceanography 1:429–436.
Dugdale, R. C. andJ. J. Goering. 1967. Uptake of new and regenerated forms of nitrogen in primary productivity.Limnology and Oceanography 12:196–206.
Dustan, P. andJ. C. Halas. 1987. Changes in the reef-coral community of Carysfort Reef, Key Largo, Florida, 1974–1982.Coral Reefs 6:91–106.
Horne, A. J. 1977. Nitrogen fixation—A review of this phenomenon as a polluting process.Progress in Water Technology 8:359–372.
Howarth, R. W. 1988. Nutrient limitation of net primary production in marine ecosystems.Annual Review of Ecology and Systematics 19:89–110.
Jackson, G. A. andP. M. Williams 1985. Importance of dissolved organic nitrogen and phosphorus to biological nutrient cycling.Deep Sea Research 32:223–235.
Johannes, R. E. 1975. Pollution and degradation of coral reef communities, p. 13–51.In E. Wood and R. E. Johannes (eds.), Tropical Marine Pollution. Elsevier, New York.
Johannes, R. H. 1980. The ecological significance of submarine discharge of groundwater.Marine Ecology Progress Series 3:365–373.
Johannes, R. E., W. J. Wiebe, C. J. Crossland, D. W. Rimmer, andS. V. Smith. 1983. Latitudinal limits of coral reef growth.Marine Ecology Progress Series 11:105–111.
Lapointe, B. E. 1987. Phosphorus-and nitrogen-limited photosynthesis and growth ofGracilaria tikvahiae in the Florida Keys: An experimental field study.Marine Biology 93:561–568.
Lapointe, B. E. 1989. Macroalgal production and nutrient relations in oligotrophic areas of Florida Bay.Bulletin of Marine Science 44:312–323.
Lapointe, B. E. andJ. D. O’Connell. 1989. Nutrient-enhanced growth ofCladophora prolifera in Harrington Sound, Bermuda: Eutrophication of a confined, phosphorus-limited marine ecosystem.Estuarine and Coastal Shelf Science 28:347–360.
Lapointe, B. E., J. D. O’Connell, andG. S. Garrett. 1990. Nutrient couplings between on-site sewage disposal systems, groundwaters and nearshore surface waters of the Florida Keys.Biogeochemistry 10:289–307.
Lapointe, B. E., N. P. Smith, P. A. Pitts, and M. W. Clark. 1992. Baseline characterization of chemical and hydrographic processes in the water column of Looe Key National Marine Sanctuary. Final Report to the National Oceanic and Atmospheric Administration, Office of Ocean and Coastal Resource Management, Washington, D.C. 66 p.
Laws, E. A. andD. G. Redalje. 1979. Effect of sewage enrichment on the phytoplankton population of a subtropical estuary.Pacific Science 33:129–144.
Littler, M. M. andD. S. Littler. 1985. Models of tropical reef biogenesis: The contribution of algae.Progress in Phycological Research 3:323–364.
MacVicar, T. K. 1983. Rainfall averages and selected extremes for central and south Florida. South Florida Water Management District, Technical publication #83-2, West Palm Beach, Florida.
Marmer, H. A. 1954. Tides and sea level in the Gulf of Mexico. United States Fish and Wildlife Service.Fisheries Bulletin 55:101–118.
Marsh, J. A. 1977. Terrestrial inputs of nitrogen and phosphorus on fringing reefs of Guam, p. 331–336.In D. Taylor (ed.), Proceedings of the Third International Coral Reef Symposium 1. Biology. University of Miami Rosenstiel School of Marine and Atmospheric Sciences, Miami, Florida.
Mee, L. D. 1988. A definition of “critical eutrophication” in the marine environment.Revista de Biologia Tropical 36:159–161.
Menzel, D. W. andN. Corwin. 1965. The measurement of total phosphorus in seawater based on the liberation of organically bound fractions by persulfate oxidation.Limnology and Oceanography 10:280–282.
Murphy, J. andJ. P. Riley. 1962. A modified single solution method for determination of phosphate in natural waters.Analytica Chimica Acta 26:31–36.
Nixon, S. W., C. A. Oviatt, J. Frithsen, andB. Sullivan. 1986. Nutrients and the productivity of estuarine and coastal marine ecosystems.Journal of Limnological Society of South Africa 12:43–71.
Odum, H. T. andR. F. Wilson. 1962. Further studies on reaeration and metabolism of Texas Bays, 1958–1960.Institute of Marine Science Publications 8:23–55.
Orth, R. J. andR. Moore. 1984. Distribution and abundance of submerged aquatic vegetation in Chesapeake Bay: An historical perspective.Estuaries 7:531–540.
Pastorok, R. A. andG. R. Bilyard. 1985. Effects of sewage pollution on coral reef communities.Marine Ecology Progress Series 21:175–189.
Peierls, B. L., N. F. Caraco, M. L. Pace, andJ. J. Cole. 1991. Human influence on river nitrogen.Nature 350:386–387.
Pomeroy, L. R. 1960. Residence time of dissolved phosphate in natural waters.Science 131:1731–1732.
Powell, G. V. N., W. J. Kenworthy, andJ. W. Fourqurean. 1989. Experimental evidence for nutrient limitation of sea-grass growth in a tropical estuary with limited circulation.Bulletin of Marine Science 44:324–340.
Redfield, A. C. 1958. The biological control of chemical factors in the environment.American Scientist 46:205–222.
Robblee, M. B., T. R. Barber, P. R. Carlson, Jr.,M. J. Durako, J. W. Fourqurean, L. K. Muehlstein, D. Porter, L. A. Yarbro, R. T. Zieman, andJ. C. Zieman. 1991. Mass mortality of the tropical seagrassThalassia testudinum in Florida Bay (USA).Marine Ecology Progress Series 71:297–299.
Rogers, C. S. 1990. Responses of coral reefs and reef organisms to sedimentation.Marine Ecology Progress Series 62:185–202.
Short, F. T. 1987. Effects of sediment nutrients on seagrasses: Literature review and mesocosm experiments.Aquatic Botany 27:41–57.
Short, F. T., W. C. Dennison, andD. G. Capone. 1990. Phosphorus-limited growth of the tropical seagrassSyringodium filiforme in carbonate sediments.Marine Ecology Progress Series 62:169–174.
Silberstein, K., Chiffings, A. W., andA. J. McComb. 1986. The loss of seagrass in Cockburn Sound, Australia. III. The effects of epiphytes on productivity ofPosidonia australis. Hook. F.Aquatic Botany 24:355–371.
Simmons, J. A. K., T. Jickells, A. Knap, andW. B. Lyons. 1985. Nutrient concentrations in groundwaters from Bermuda: Anthropogenic effects, p. 383–398. In D. E. Caldwell and J. A. Brierly (eds.), Planetary Ecology. Van Nostrand Reinhold Company, Inc., New York.
Smith, S. V., W. J. Kimmerer, E. A. Laws, R. E. Brock, andT. W. Walsh. 1981. Kaneohe Bay sewage diversion experiment: Perspectives on ecosystem response to nutritional perturbation.Pacific Science 35:279–397.
Suttle, C. S. andP. J. Harrison. 1988. Ammonium and phosphate uptake kinetics of size-fractionated plankton from an oligotrophic freshwater lake.Journal of Plankton Research 10:133–149.
Technicon. 1973. Technicon Autoanalyzer II, Industrial Methods. Technicon Industrial Systems, Tarrytown, New York.
Tomascik, T. andF. Sander. 1985. Effects of eutrophication on reef-building corals. I. Growth rate of the reef-building coralMontastrea annularis.Marine Biology 87:143–155.
Tomascik, T. andF. Sander. 1987. Effects of eutrophication on reef building corals: Reproduction of the reef-building coralPorites porites.Marine Biology 94:77–94.
Tomasko, D. A. andB. E. Lapointe. 1991. Productivity and biomass ofThalassia testudinum as related to water column nutrients and epiphyte levels: Field observations and experimental studies.Marine Ecology Progress Series 75:9–17.
Turner, R. E. andN. N. Rabalais. 1991. Changes in Mississippi River water quality this century.Bioscience 41:140–147.
United States Environmental Protection Agency. 1983. Methods for chemical analysis of water and wastes. EPA-600/4-79-020. Environmental Monitoring and Support Laboratory, United States Environmental Protection Agency, Cincinnati, Ohio. 430 p.
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 10:177–198.
Walker, D. I. andR. F. G. Ormond. 1982. Coral death from sewage and phosphate pollution at Aqaba Red Sea.Marine Pollution Bulletin 13:21–25.
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Authors and Affiliations
Division of Estuarine, Coastal, and Ocean Sciences, Harbor Branch Oceanographic Institution, Inc., Route 3, Box 297A, 33043, Big Pine Key, Florida
Brian E. Lapointe
Florida Keys Land & Sea Trust, P.O. Box 536, 33050, Marathon, Florida
Brian E. Lapointe & Mark W. Clark
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Lapointe, B.E., Clark, M.W. Nutrient inputs from the watershed and coastal eutrophication in the Florida keys.Estuaries15, 465–476 (1992). https://doi.org/10.2307/1352391
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