Coral Reefs

, Volume 15, Issue 1, pp 21–41 | Cite as

Water column and sediment nitrogen and phosphorus distribution patterns in the Florida Keys, USA

  • A. M. Szmant
  • A. Forrester
Reports

Abstract

Measurements of the distribution patterns of nutrients (ammonium, nitrate, orthophosphate, total N and total P) and chlorophyll concentrations were conducted under an interdisciplinary program known as SEAKEYS, initiated because of concern that anthropogenic nutrients may be impacting Florida coral reefs. Samples were collected along transects that extended from passes or canals to 0.5 km offshore of the outermost reefs. Seven of the transects were either in the Biscayne National Park (BNP) and Key Largo (upper keys) or Seven Mile Bridge/Looe Key (upper part of lower keys) areas, which have the best present-day reef development; the two in the middle keys off Long Key were in an area of minimal reef development where passes allow estuarine Florida Bay water to flow onto the Florida reef platform. Off the upper keys, water column concentrations of N and chl a were elevated near marinas and canals (1 μM NO3, 1 μg/l chl a), but returned to oligotrophic levels (e.g., chl a ⩽ 0.25 μg/l; NO3 ⩽ 0.25 μM; NH4 ⩽ 0.10 μM) within 0.5 km of shore. Phosphorus concentrations, however, were often higher offshore ⩾ 0.2 μM PO4). Sediment interstitial nutrient concentrations decreased from inshore to the offshore reef areas (e.g., ⩾ 100 μM NH4 inshore to ⩽ 50 μM NH4 offshore) and were comparable to those of some presumably pristine coastal and reef carbonate sediments. Sediment bulk N was higher nearshore and decreased steeply offshore ( ⩾ 60 μg-at N/gm sediment to ⩽ 20 μg-at N/gm sediment, respectively); bulk P concentrations (⩽ 6 μg- at P/gm sediment) varied little or exhibited the reverse pattern. Sediment N:P ratios were consistently lower offshore (1–10 vs. 20–40 nearshore). Higher offshore P concentrations are attributed to periodic upwelling along the shelf edge. In the middle keys water column nutrients and chl a concentrations were both higher than those in the upper keys, and there was less of an inshore-offshore decrease than that noted in the upper keys. Sediment nutrients were higher also, and nearshore and offshore areas did not differ. Water column and sediment nutrient concentrations and distribution patterns in the upper part of the lower keys were most similar to those measured in the upper keys. Overall, the present data do not support the contention that reef areas in the upper keys are accumulating elevated loads of land-derived nutrients via surface water flow, but does document moderately elevated nutrient and chl a levels in many developed nearshore areas. Most of the anthropogenic and natural nutrients entering the coastal waters from shore appear to be taken up by near shore algal and seagrass communities before they reach patch reef areas. Further work is needed to determine whether nutrient-enriched ground waters reach the reefs, however these would be expected to cause an enrichment of reef sediments, which was not observed.

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References

  1. Aller RC, Cochran JK (1976)234Th/238U disequilibrium in nearshore sediment: particle reworking and diagenetic time scales. Earth Planet Sci Lett 29:37–50Google Scholar
  2. Atkinson MJ (1987) Low phosphorus sediments in a hypersaline marine bay. Est Coastal Shelf Sci 24:335–347Google Scholar
  3. Atkinson MJ, Smith SV (1983) C:N:P ratios of benthic marine plants. Limnol Oceanogr 28:382–388Google Scholar
  4. Bell PRF (1992) Eutrophication and coral reefs—Some examples in the Great Barrier Reef Lagoon. Water Res 26:553–568Google Scholar
  5. Boesch DF, Armstrong NE, D'Elia CF, Maynard NG, Paerl HW, Williams SL (1993) Deterioration of the Florida Bay ecosystem: an evaluation of the scientific evidence. Report to Interagency Working Group on Florida Bay. Key Largo, September 15, 1993Google Scholar
  6. Crossland CJ (1988) Latitudinal comparisons of coral reef structure and function. Proc 6th Int Coral Reef Symp, Townsville Australia, 1:221–226Google Scholar
  7. D'Elia CF, Wiebe WJ (1990) Biogeochemical nutrient cycles in coral reef ecosystems. In: Dubinsky Z, (ed) Ecosystems of the world vol 25, coral reefs Elsevier, New York, pp 49–74Google Scholar
  8. D'Elia CF, Steudler PA, Corwin N (1977) Determination of total nitrogen in aqueous samples using persulfate digestion. Limnol Oceanogr 22:760–764Google Scholar
  9. D'Elia CF, Webb KL, Porter JW (1981) Nitrate-rich groundwater inputs to Discovery Bay, Jamaica: a significant source of N to local reefs? Bull Mar Sci 31:903–910Google Scholar
  10. Dustan P, Halas JC (1987) Changes in the reef-coral community of Carysfort Reef, Key Largo, Florida: 1974 to 1982. Coral Reefs 6:91–106Google Scholar
  11. EPA (1991) Water quality protection program for the Florida Keys National Marine Sanctuary. Phase 1 Report Prepared for US Environmental Protection Agency, Office of Wetlands, Oceans and Watersheds by Continental Shelf Assoc, Jupiter Fl, USAGoogle Scholar
  12. Entsch B, Boto KG, Sim RG, Wellington JT (1983) Phosphorus and nitrogen in coral reef sediments. Limnol Oceanogr 28:465–476Google Scholar
  13. Fourqurean JW, Zieman JC, Powell GVN (1992) Relationships between porewater nutrients and seagrasses in a subtropical carbonate environment. Mar Biol 114:57–65Google Scholar
  14. Fourqurean JW, Jones RD, Zieman JC (1993) Processes influencing water column nutrient characteristics and phosphorus limitation of phytoplankton biomass in Florida Bay, FL, USA: inferences from spatial distribution. Est Coastal Shelf Sci 36:295–314Google Scholar
  15. Furnas MJ, Mitchell AW, Skuza M (1993) Nitrogen and phosphorus budgets for the Great Barrier Reef. Australian Inst Mar Sci, Final Rep to Great Barr Reef Mar Park Auth, Townville, 234 ppGoogle Scholar
  16. Ginsburg RN (1993) Global aspects of coral reefs: Health, hazards and history. Proc Coll Forum, University of Miami, June 1993Google Scholar
  17. Ginsburg RN, Shinn EA (1964) Distribution of the reef-building community in Florida and the Bahamas. Bull Am Assoc Petrol Geol 66:310–318Google Scholar
  18. Glynn PW, Szmant AM, Corocoran E, Cofer-Shabica S (1989) Condition of coral reef cnidarians from the northern Florida Reef tract: pesticides, heavy metals and histopathological examination. Mar Pollut Bull 20:568–576Google Scholar
  19. Grigg RW (1995) Coral reefs in an urban embayment in Hawaii: a complex case history controlled by natural and anthropogenic stress. Corel Reefs 14:253–266Google Scholar
  20. Hallock P, Schlager W (1986) Nutrient excess and the demise of coral reefs and carbonate platforms. Palaios 1:389–398Google Scholar
  21. Hallock P, Müller-Karger FE, Halas JC (1993) Coral reef decline. Nat Geog Res Explor 9:358–378Google Scholar
  22. Hatcher, BG (1985) Ecological research at the Houtman's Abrohlos: high latitude reefs of Western Australia. Proc. Fifth Int Coral Reef Congr Tahiti 6:291–297Google Scholar
  23. Hines ME, Lyons WB (1982) Biogeochemistry of nearshore Bermuda sediments. I. Sulfate reduction rates and nutrient generation. Mar Ecol Prog Ser 8:87–94Google Scholar
  24. Hudson HJ (1981) Growth raters inMontastrea annularis: a record of environmental change in Key Largo National Marine Sanctuary, Florida. Bull Mar Sci 31:444–459Google Scholar
  25. Hudson HJ, Hanson KJ, Halley RB, Kindinger JL (1994) Environmental implications of growth rate changes inMontastrea annularis: Biscayne National Park, Florida. Bull Mar Sci 54:647–669Google Scholar
  26. Hughes TP (1994) Catastrophes, phase shifts, and large-scale degradation of a Caribbean coral reef. Science 265:1547–1551Google Scholar
  27. Jaap WC (1979) Observations on zoozanthellae explusion at Middle Sambo Reef, Florida Keys. Bull Mar Sci 29:414–422Google Scholar
  28. Jaap WC (1984) The ecology of the South Florida coral reefs: a community profile. FWS/OBS-82/08Google Scholar
  29. Johannes RE, Wiebe WJ, Crossland CJ, Rimmer DW, Smith SV (1983) Latitudinal limits to coral reef growth. Mar Ecol Prog Ser 11:105–111Google Scholar
  30. Keating D (1991) Pollution killing coral reef, biologist says. Miami Herald 13 March 1991Google Scholar
  31. Klump JV, Martens CS (1983) Benthic nitrogen regeneration. In: Carpenter ED, Capone DG, (eds) Nitrogen in the marine environment. Academic Press, New York, pp 411–457Google Scholar
  32. Lapointe BE (1987) Phosphorus- and nitrogen-limited photosynthesis and growth ofGracilaria tikvahiae (Rhodophyceae) in the Florida Keys: an experimental field study. Mar Biol 93:561–568Google Scholar
  33. Lapointe BE (1989) Caribbean coral reefs: are they becoming algal reefs? Sea Front 35:82–91Google Scholar
  34. Lapointe BE, Clark MW (1992) Nutrient inputs from the watershed and coastal eutrophication of the Florida Keys. Estuaries 15:465–476Google Scholar
  35. Lapointe BE, O'Connell JD, Garrett G (1990) Nutrient couplings between on-site sewage disposal systems, groundwaters, and nearshore surface waters of the Florida keys. Biogeochem 10:289–307Google Scholar
  36. Lapointe BE, Tomasko DA, Matzie WR (1994) Eutrophication and trophic state classification of seagrass communities in the Florida Keys. Bull Mar Sci 54:696–717Google Scholar
  37. Leder J, Szmant AM, Swart PW (1991) The effect of prolonged bleaching on skeletal banding and stable isotope composition inMontastrea annularis. Preliminary observations. Coral Reefs 10:19–27Google Scholar
  38. Lee TN, Rooth C, Williams E, McGowan M, Szmant AM, Clarke ME (1992) Influence of Florida Current, gyres and wind-driven circulation on larvae transport and recruitment in the Florida Keys coral reefs. Cont Shelf Res 12:971–1002Google Scholar
  39. Lee TN, Clarke ME, Williams E, Szmant AM, Berger T (1994) Evolution of the Tortugas Gyre and its influence on recruitment in the Florida Keys. Bull Mar Sci 54:621–649Google Scholar
  40. Lidz BH. Hine AC, Shinn EA, Kindinger JL (1991) Multiple outer-reef tracts along the south Florida bank margin: outlier reefs, a new windward-margin model. Geology 19:115–118Google Scholar
  41. Lighty RG (1977) Relic shelf-edge Holocene coral reef: southeast coast of Florida. Proc Third Int Coral Reef Symp Miami 2:215–222Google Scholar
  42. Lighty RG (1981) Fleshy-algal domination of a modern Bahamian barrier reef. example of an alternate climax reef community. Proc Fourth Int Coral Reef Symp, Manila 1:722Google Scholar
  43. Marzelak DS, Babeshoff Jr G, Noel MR, Worley DR (1977) Reef distribution in South Florida. Proc Third Int Coral Reef Sym, Miami 2:223–229Google Scholar
  44. McGlathery KJ, Howarth RW, Marino R (1992) Nutrient limitation of the macroalga,Penicillus capitatus, associated with subtropical seagrass meadows in Bermuda. Estuaries 15:18–25Google Scholar
  45. McGlathery KJ, Marino R, Howarth RW (1994) Variable rates of uptake by shallow marine carbonate sediments: mechanisms and ecological significance. Biogeochem 25:127–146Google Scholar
  46. Morse JW, Zullig JJ, Iverson RI, Choppin GR, Mucci A, Millero FJ (1987) The influence of seagrass beds on carbonate sediments in the Bahamas. Mar Chem 22:71–83Google Scholar
  47. Nixon SW, Pilson MEQ (1983) Nitrogen in estuarine and coastal marine ecosystems. In: Carpenter ED, Capone DG (eds) Nitrogen in the marine environment. Academic Press, New York, pp 565–648Google Scholar
  48. Ogden JC, Porter JW, Smith NP, Szmant AM, Jaap WC, Forcucci D (1994) A long-term interdisciplinary study of the Florida Keys seascape. Bull Mar Sci 54:1059–1071Google Scholar
  49. Parsons TR, Takahashi M, Hargrave B (1984a) Biological oceanographic processes. Pergamon New York USAGoogle Scholar
  50. Parsons TR, Maita Y, Lalli CM (1984b) A manual of chemical and biological methods for seawater analysis. Pergamon, New YorkGoogle Scholar
  51. Pastorok RA, Bilyard GR (1985) Effects of sewage pollution on coralreef communities. Mar Ecol Prog Ser 21:175–189Google Scholar
  52. Paul JH, Rose JB, Brown J, Shinn EA, Miller S, Farrah SR (1995a) Viral tracer studies indicate contamination of marine waters by sewage disposal practices in Key Largo, Florida. Appl Environ Microbiol 61:2230–2234Google Scholar
  53. Paul JH, Rose JB, Jiang S, Kellogg C, Shinn EA (1995b) Occurrence of fecal indicator bacteria in surface waters and subsurface aquifer in Key Largo, Florida. Appl Environ Microbiol 61:2235–2241Google Scholar
  54. Pitts PA (1994) An investigation of near-bottom flow patterns along and across Hawk Channel, Florida Keys. Bull Mar Sci 54:610–620Google Scholar
  55. Porter JW, Miler OW (1992) Quantification of loss and change in Floridian coral reef populations. Am Zool 32:625–640Google Scholar
  56. Powell GVN, Kenworthy WJ, Fourqurean JW (1989) Experimental evidence for nutrient limitation of seagrass growth in a tropical estuary with restricted circulation. Bull Mar Sci 44:324–340Google Scholar
  57. Roberts HH, Rouse Jr LJ, Walker ND, Hudson JH (1982) Coldwater stress in Florida Bay and northern Bahamas: a product of winter cold air outbreaks. J Sediment Petrol 42:145–155Google Scholar
  58. Robblee MB, Barber TR, Carlson PR, Durako MJ, Fourqurean JW, Muehlstein LK, Porter D, Yorbro LA, Zieman RT, Zieman JC (1991) Mass mortality of the tropical seagrassThalassia testudinium in Florida Bay. Mar Ecol Prog Ser 71:297–299Google Scholar
  59. Rosenfeld JK (1979) Interstitial water and sediment chemistry of two cores from Florida Bay. J Sediment Pet 49:989–994Google Scholar
  60. Sheehan K (1991) Keys “environmental summit” report gets mixed reactions. Island Navigator 5(2):1–3Google Scholar
  61. Shinn EA (1989) What is really killing the corals? Sea Front 35:72–81Google Scholar
  62. Shinn EA, Lidz BH, Kindinger JL, Hudson JH, Halley RB (1989) Reefs of Florida and the Dry Tortugas. A guide to the modern carbonate environments of the Florida Keys and the Dry Tortugas. USGS, St Petersburg Fl, MayGoogle Scholar
  63. Short FT, Davis HW, Gibson RA, Zimmerman CF (1985) Evidence for P limitation in carbonate sediments of the seagrassSyringodium filiforme. Est Coastal Res Sci 20:419–430Google Scholar
  64. Smith NP (1994) Long-term Gulf-to-Atlantic transport through tidal channels in the Florida Keys. Bull Mar Sci 54:602–609Google Scholar
  65. Smith SV, Kimmerer WJ, Laws EA, Brock RE, Walsh TE (1981) Kaneohe Bay sewage diversion experiment: perspectives on ecosystem responses to nutritional perturbation. Pac Sci 35:279–395Google Scholar
  66. Szmant-Froelich A (1983) Functional aspects of nutrient cycling on coral reefs. In: The ecology of deep and shallow coral reefs: Symp Ser Undersea Res NOAA Undersea Res Prog, vol 1:133–139Google Scholar
  67. Szmant AM, Forrester A (1994) Temporal and spatial patterns of nutrient and chlorophyll distribution: Florida Reef tract, summer fall 1992. Final Rep to The Nature Conservancy, Florida Inst OceanogrGoogle Scholar
  68. Szmant AM, Ferrer LM, FitzGerald LM (1990) Nitrogen excretion and O:N ratios in reef corals: evidence for conservation of nitrogen. Mar Bio 104:119–127Google Scholar
  69. Tomascik T, Sander F (1985) Effects of eutrophication on reef building corals. I. Growth rate of the reef-building coralMontastrea annularis. Mar Biol 87:143–155Google Scholar
  70. Torrance DC (1991) Deep ecology: rescuing Florida's reefs. Nature Conservancy July–Aug:9–17Google Scholar
  71. Ullman WJ, Sandstrom MW (1987) Dissolved nutrient fluxes from the nearshore sediments of Bowling Green Bay, central Great Barrier Reef lagoon (Australia). Est Coastal Shelf Sci 24:289–303Google Scholar
  72. Vaughan TW (1918) The temperature of the Florida coral reef tract. Carnegie Inst Wash Publ 213:321–339Google Scholar
  73. Walker ND (1981) January water temperatures kill Florida fauna. Coast Oceanogr Climatol News 3:30Google Scholar
  74. Wanless HR, Tagett MG (1989) Origin, growth and evolution of carbonate mudbanks in Florida Bay. Bull Mar Sci 44:454–489Google Scholar
  75. Ward F (1990) Florida's coral reefs are imperiled. Nat Geog 178:114–132Google Scholar
  76. Wells J (1957) Coral reefs. Mem Geol Soc Am 67:609–631Google Scholar
  77. Williams SL (1984a) The uptake of sediment ammonium and translocation in the marine green algaCaulerpa cupressoides. Limnol Oceanogr 29:374–379Google Scholar
  78. Williams SL (1984b) Decomposition of the tropical macroalgaCaulerpa cupressoides: field and laboratory studies. J Exp Mar Biol Ecol 80:109–124Google Scholar
  79. Williams SL, Yarish SM, Gill IP (1985) Ammonium distributions, production, and efflux from backreef sediments, St Croix, US Virgin Islands. Mar Ecol Prog Ser 24:57–64Google Scholar
  80. Zieman JC (1982) The ecology of the seagrasses of South Florida: a community profile. US Fish and Wildlife Service Program FWS/OBS-82/25123Google Scholar

Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • A. M. Szmant
    • 1
  • A. Forrester
    • 1
  1. 1.RSMAS-MBFUniversity of MiamiMiamiUSA

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