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Estuaries

, Volume 22, Issue 2, pp 417–430 | Cite as

Seasonal and long-term trends in the water quality of Florida Bay (1989–1997)

  • Joseph N. BoyerEmail author
  • James W. Fourqurean
  • Ronald D. Jones
Article

Abstract

Analysis of 6 yr of monthly water quality data was performed on three distinct zones of Florida Bay: the eastern bay, central bay, and western bay. Each zone was analyzed for trends at intra-annual (seasonal), interannual (oscillation), and long-term (monotonic) scales. the variables TON, TOC, temperature, and TN∶TP ratio had seasonal maxima in the summer rainy season; APA and Chla, indicators of the size and activity of the microplankton tended to have maxima in the fall. In contrast, NO3 , NO2 , NH4 +, turbidity, and DOsat, were highest in the winter dry season. There were large changes in some of the water quality variables of Florida Bay over the study period. Salinity and TP concentrations declined baywide while turbidity increased dramatically. Salinity declined in the eastern, central, and western Florida Bay by 13.6‰, 11.6‰, and 5.6‰, respectively. Some of the decrease in the eastern bay could be accounted for by increased freshwater flows from the Everglades. In contrast to most other estuarine systems, increased runoff may have been partially responsible for the decrease in TP concentrations as input concentrations were 0.3–0.5 μM. Turbidity in the eastern bay increased twofold from 1991 to 1996, while in the central and western bays it increased by factors of 20 and 4, respectively. Chla concentrations were particularly dynamic and spatially heterogeneous. In the eastern bay, which makes up roughly half of the surface area of Florida Bay, Chla declined by 0.9 μg l−1 (63%). The hydrographically isolated central bay zone underwent a fivefold increase in phytoplankton biomass from 1989 to 1994, then rapidly declined to previous levels by 1996. In western Florida Bay there was a significant increase in Chla, yet median concentrations of Chla in the water column remained modest (∼2 μg l−1) by most estuarine standards. Only in the central bay did the DIN pool increase substantially (threefold to sixfold). Notably, these changes in turbidity and phytoplankton biomass occurred after the poorly-understood seagrass die-off in 1987. It is likely the death and decomposition of large amounts of seagrass biomass can at least partially explain some of the changes in water quality of Florida Bay, but the connections are temporally disjoint and the process indirect and not well understood.

Keywords

Total Organic Carbon Total Phosphorus Alkaline Phosphatase Activity Soluble Reactive Phosphorus Total Phosphorus Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature Cited

  1. Boyer, J. N., J. W. Fourqurean, andR. D. Jones. 1997. Spatial characterization of water quality in Florida Bay and White-water Bay by multivariate analysis: Zones of similar influence (ZSI).Estuaries 20:743–758.CrossRefGoogle Scholar
  2. Boyer, J. N. andR. D. Jones. 1999. Effects of freshwater inputs and loading of phosphorus and nitrogen on the water quality of Eastern Florida Bay, p. 321–329.In K. R. Reddy (ed.), Phosphorus Biogeochemistry in Sub-tropical Ecosystems. CRC/Lewis Publishers, Boca Raton, Florida.Google Scholar
  3. Butler, IV,M. J., J. H. Hunt, W. F. Herrnkind, M. J. Childress, R. Bertelson, W. Sharp, T. Mathews, J. M. Field, andH. G. Marshall. 1995. Cascading disturbances in Florida Bay, USA: Cyanobacteria blooms, sponge mortality, and implications for juvenile spiny lobstersPanulirus argus.Marine Ecology Progress Series 129:119–125.CrossRefGoogle Scholar
  4. Capone, D. G. andB. F. Taylor. 1980. Microbial nitrogen cycling in a seagrass community, p. 153–161.In V. S. Kennedy (ed.), Estuarine Perspectives. Academic Press, New York.Google Scholar
  5. Chatfield, C. 1989. The Analysis of Time Series. Chapman & Hall, New York.Google Scholar
  6. Dennison, W. C. 1987. Effects of light on seagrass photosynthesis, growth and depth distributions.Aquatic Botany 27:15–26.CrossRefGoogle Scholar
  7. Fourqurean J. W., R. D. Jones, andJ. C. Zieman. 1993. Processes influencing water column nutrient characteristics and phosphorus limitation of phytoplankton biomass in Florida Bay, FL, USA: Inferences from spatial distributions.Estuarine Coastal and Shelf Science 36:295–314.CrossRefGoogle Scholar
  8. Fourqurean, J. W., G. V. N. Powell, W. J. Kenworthy, andJ. C. Zieman. 1995. The effects of long-term manipulation of nutrient supply on competition between the seagrassesThalassia testudinum andHalodule wrightii in Florida Bay.Oikos 72:349–358.CrossRefGoogle Scholar
  9. Fourqurean, J. W., G. V. N. Powell, andJ. C. Zieman. 1992. Relationships between porewater nutrients and seagrasses in a subtropical carbonate environment.Marine Biology 114:57–65.Google Scholar
  10. Fourqurean, J. W., andM. B. Robblee. 1999. Florida Bay: A brief history of recent ecological changes.Estuaries 22:345–357.CrossRefGoogle Scholar
  11. Frankovich, T. A., andR. D. Jones. 1998. A rapid, precise, and sensitive method for the determination of total nitrogen in natural waters.Marine Chemistry 60:227–234.CrossRefGoogle Scholar
  12. García, H. E. andL. I. Cordon. 1992. Oxygen solubility in seawater: Better fitting equations.Limnology and Oceanography 37:1307–1312.Google Scholar
  13. Hall, M. O., M. J. Durako, J. W. Fourqurean, andJ. C. Zieman. 1999. Decadal changes in seagrass distribution and abundance in Florida Bay.Estuaries 22:445–459.CrossRefGoogle Scholar
  14. Hela, J. 1952. Remarks on the climate of southern Florida.Bulletin of Marine Science 2:438–447.Google Scholar
  15. Hirsch, R. M., R. B. Alexander, andR. A. Smith. 1991. Selection of methods for the detection and estimation of trends in water quality.Water Resources Research 27:803–813.CrossRefGoogle Scholar
  16. Light, S. S. andJ. W. Dineen. 1994. Water control in the Everglades: A historical perspective, p. 47–84.In S. M. Davis and J. C. Ogden (eds.), Everglades: The Ecosystem and Its Restoration. St. Lucie Press, Delray Beach, Florida.Google Scholar
  17. McGill, R., J. W. Tukey, andW. A. Larsen. 1978. Variations of box plots.American Statistician 32:12–16.CrossRefGoogle Scholar
  18. Phlips, E. J. andS. Badylak. 1996. Spatial variability in phytoplankton standing crop and composition in a shallow innershelf lagoon, Florida Bay, Florida.Bulletin of Marine Science 58: 203–216.Google Scholar
  19. Robblee, M. B., T. B. Barber, P. R. Carlson, Jr.M. J. Durako, J. W. Fourqurean, L. M. Muehlstein, D. Porter, L. A. Yabro, 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.CrossRefGoogle Scholar
  20. Ruddnick, D., Z. Chen, D. Childers, T. Fontaine, andJ. N. Boyer. 1999. Phosphorus and nitrogen inputs to Florida Bay: The importance of the Everglades watershed.Estuaries 22:398–416.CrossRefGoogle Scholar
  21. Schmidt, T. W. 1979. Ecological study of the fishes and the water quality characteristics of Florida Bay, Everglades National Park, Florida. United States National Park Service, Everglades National Park, Homestead, Florida.Google Scholar
  22. Schomer, N. S. and R. D. Drew. 1982. An ecological classification of the lower Everglades, Florida Bay and the Florida Keys. United States Fish and Wildlife Service FWS/OBS-82/58.1. Washington, D. C.Google Scholar
  23. Smith, N. 1994. Long-term Culf-to-Atlantic transport through tidal channels in the Florida Keys.Bulletin of Marine Science 54: 602–609.Google Scholar
  24. Solórzano, L. andJ. H. Sharp. 1980. Determination of total dissolved phosphorus and particulate phosphorus in natural waters.Limnology and Oceanography 25:754–758.CrossRefGoogle Scholar
  25. Tabb, D. C. andM. A. Roessler. 1989. History of studies on juvenile fishes of coastal waters of Everglades National Park.Bulletin of Marine Science 44:23–34.Google Scholar
  26. Tilmant, J. T. 1989. A history and an overview of recent trends in the fisheries of Florida Bay.Bulletin of Marine Science 44:3–22.Google Scholar
  27. Zieman, J. C. 1982. The ecology of seagrasses of south Florida: A community profile. United States Fish and Wildlife Service FWS/OBS-82/25, Washington, D. C.Google Scholar

Copyright information

© Estuarine Research Federation 1999

Authors and Affiliations

  • Joseph N. Boyer
    • 1
    Email author
  • James W. Fourqurean
    • 2
  • Ronald D. Jones
    • 2
  1. 1.Southeast Environmental Research CenterFlorida International UniversityMiami
  2. 2.Southeast Environmental Research Center and Department of Biological SciencesFlorida International UniversityMiami

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