Impact of Nutrient Loading and Hydrodynamics on Algal Biomass in the Suwannee River Estuary Erin Bledsoe and Edward Phlips Department of Fisheries and.

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Presentation transcript:

Impact of Nutrient Loading and Hydrodynamics on Algal Biomass in the Suwannee River Estuary Erin Bledsoe and Edward Phlips Department of Fisheries and Aquatic Sciences Institute of Food and Agricultural Sciences University of Florida

High Nutrient Concentrations High Nutrient Concentrations Short Residence Time Short Residence Time Low Light Availability Low Light Availability Low Phytoplankton Biomass High Nutrient Potential Estuary D. Hornsby

GOALS: to determine the relationship between spatial and temporal patterns of nutrient loading and the concentration and distribution of phytoplankton standing crops Nutrient Loading Bioavailable Nutrients Light Availability Hydraulic Flushing Macroalgal Distribution and Abundance Micro-zooplankton Grazing

POTENTIAL LIGHT LIMITATION I m, Mean Irradiance in the Mixing Zone 2 to 4 mol photon m -2 s -1 Average Discharge April March 1999 Low Discharge April April 2001

ESTIMATED SUWANNEE RIVER LOADING RATES Nitrate SRP Apalachicola River Neuse River, NC

NUTRIENT LIMITATION BIOASSAYS Average Discharge April March 1999 Low Discharge April April 2001 No Nutrient Limitation N Limitation P Limitation N and P Co-Limitation

EFFECTS OF NUTRIENT LOADING ON PHYTOPLANKTON BIOMASS

MEAN PHYTOPLANKTON BIOMASS 321 Low Discharge April April 2001 Average Discharge April March 1999 Chlorophyll a (µg chl a L -1 )

FLUSHING RATE IN THE REEF REGION BASED ON RIVERINE DISCHARGE Mean Discharge, 310 m 3 s -1

WIND DYNAMICS

Meteorological changes in rainfall-related nutrient loading and wind-driven circulation play a significant role in defining the abundance and distribution of phytoplankton in the Suwannee River and its estuary SUMMARY Wind-forcing (reef region) Nutrient limitation (nearshore region) Flushing time (river region and reef region) Light limitation (river region)

Funding : Suwannee River Water Management District Thanks to: Susan Badylak Jason Hale Thomas FrazerMary CichraChristina Jett Shirley BakerKaren DonnellyNatalie Love Thomas CrismanJessica Frost-Fajans Beth Sargent Charles CichraTammy Grosskopf Michael Quinlan Special thanks to: Rob Mattson and David Hornsby of the Suwannee River Water Management District ACKNOWLEDGMENTS