Jim McClelland Rae Mooney University of Texas at Austin

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Presentation transcript:

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

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

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

San Antonio, Guadalupe, Mission and Aransas River Watersheds

DON: concentration-runoff relationships

NO3-: concentration-runoff relationships

NH4+: Concentration-runoff relationships

Water discharge, 2000-2007

Mission and Aransas river export, 2007 % export during July AR MR NO3- 32 40 NH4+ 57 45 DON 70 55 9

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

Salinity response in Copano Bay

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

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

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

September-January Recovery Period

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