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Jim McClelland Rae Mooney University of Texas at Austin

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Presentation on theme: "Jim McClelland Rae Mooney University of Texas at Austin"— Presentation transcript:

1 Watershed Export and Estuarine Ecosystem Response to Pulsed Inputs of Nitrogen to South Texas Bays
Jim McClelland Rae Mooney University of Texas at Austin Marine Science Institute

2 Sampling San Antonio & Guadalupe
Sampling base flow monthly 12/07 – 6/08 • Increased base flow sampling each week 6/08 – 8/08 • 9/08 – present, base flow sampling every 2 weeks • Storm event sampling continuous Mission & Aransas Monthly and event sampling 7/07 – 11/08

3 Analysis Mission & Aransas All analyses ran San Antonio & Guadalupe
Nitrate, ammonium, phosphorus, DON, DOC, PON, δ15N, POC, δ13C, TSS San Antonio & Guadalupe Summer 09 – finish analyses

4 San Antonio, Guadalupe, Mission and Aransas River Watersheds

5 DON: concentration-runoff relationships

6 NO3-: concentration-runoff relationships

7 NH4+: Concentration-runoff relationships

8 Water discharge,

9 Mission and Aransas river export, 2007
% export during July AR MR NO NH DON 9

10 Copano Bay Sampling Sites
East Copano Aransas Copano West Collecting water samples each month and during and after storm events. Quantified nutrient concentrations and then calculated load cultivated crops: Aransas river watershed 45%, mission river 6% Forest/shrub: Aransas 25%, mission 51% 5 km 10

11 Salinity response in Copano Bay

12 Nitrate concentrations in Copano Bay
During storm, average river nitrate conc. ~ 12 µM

13 Ammonium concentrations in Copano Bay
During storm, average river ammonium conc. ~ 3 µM

14 DON concentrations in Copano Bay
During storm, average river DON conc. ~ 31 µM

15 September-January Recovery Period

16 Conclusions Characterization of water chemistry during storm events is necessary for accurate estimation of annual nitrogen export from watersheds to the coastal ocean While nitrogen concentrations in coastal waters return to pre-storm values relatively quickly after individual events, slower recovery of ammonium and DON concentrations compared to nitrate demonstrate the lasting effects of pulsed inputs through recycling Variations in the timing and magnitude of nitrogen inputs to coastal waters may fundamentally alter ecosystem structure and productivity

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