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A nutrient loading budget for Biscayne Bay, Florida.

Valentina G Caccia1, Joseph N Boyer

  • 1Southeast Environmental Research Center, OE-148, Florida International University, Miami, FL 33199, USA.

Marine Pollution Bulletin
|April 10, 2007
PubMed
Summary
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Canals are the primary source of nitrogen and phosphorus pollution in Biscayne Bay, significantly impacting water quality due to coastal development. Understanding these nutrient loadings is crucial for bay ecosystem health.

Area of Science:

  • Environmental Science
  • Water Quality Management
  • Ecosystem Health

Background:

  • Biscayne Bay's water quality is heavily impacted by coastal and watershed development.
  • Urbanization has altered natural freshwater inputs, leading to increased nutrient concentrations.
  • The Miami metropolitan area's expansion contributes significantly to these changes.

Purpose of the Study:

  • To evaluate nutrient loadings to Biscayne Bay from 1994-2002.
  • To identify and quantify contributions from canal, atmospheric, and groundwater sources.
  • To understand the influence of land use and geographic location on nutrient loads.

Main Methods:

  • Analysis of nutrient concentrations (Dissolved Inorganic Nitrogen - DIN, Total Phosphorus - TP) from various sources.

Related Experiment Videos

  • Calculation of annual nutrient budgets for Biscayne Bay.
  • Comparison of nutrient loads based on geographic location, land use, and proximity to landfills.

    • Main Results:

    • Canals were the dominant source of nitrogen (N) loading (88% of total load).
    • Nitrate+nitrite (NO(x)(-)) comprised a larger proportion of canal DIN load than ammonium (NH(4)(+)).
    • Canals contributed 66% of phosphorus (P) load, with atmospheric and groundwater also significant, especially in the south.

    Conclusions:

    • Canal discharges are the primary drivers of nutrient pollution in Biscayne Bay.
    • Land use significantly influences the type and amount of nutrients entering the bay.
    • Groundwater is an important nutrient source in the southern part of the bay.