Freshwater inflow and salinity in San Antonio Bay By Karen A. Bishop.

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Presentation transcript:

Freshwater inflow and salinity in San Antonio Bay By Karen A. Bishop

San Antonio Bay Resource management Ecosystem processes

Freshwater Inundation Events Cause changes in: Salinity Nutrients Organisms Ecosystem structure

Oysters Stationary Filter feeders High tolerance for changes in environment

*Oysters as Indicators* Plankton take up nutrients Oyster tissues take up isotope ratios when plankton consumed 13 C isotope = salinity 15 N isotope = source of nutrients

Past Questions and Research… Summer study questions: –Does 13 C represent salinity? Yes –Nutrient loading high or low? High –Do isotope values vary by location? Yes

Plotting the data points

Traces of flow paths

Plot USGS Gage Points

Salinity Gradient

What’s next… Complete a salinity time series Add 13 C values to Oyster bed points Show relationship of salinity to 13 C values over time *Model inflow and nutrient loads. Prediction model for storm events or long term changes?