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Selenium Distribution and Fluxes in Intertidal Wetlands, San Francisco Bay, California

Earth Sciences Division, Mail Stop 90-1116, Lawrence Berkeley National Lab., Berkeley, CA 94720

View larger version (62K): [in a new window]   Fig. 1. The San Francisco Estuary (central and northern) and location of field sites. Inset maps show the locations of sediment traps, sampling points, and vertical cross-sections of the Benicia State Park (BSP) and Martinez Regional Park (MRP) field sites.

View larger version (51K): [in a new window]   Fig. 2. Depth profiles of Se, organic matter (OM), Al, Fe, Cu, and Mo, averaged by habitat, at the Martinez Regional Park (MRP, upper frames) and Benicia State Park (BSP, lower frames) sites. Error bars, shown on one side of the mean values for the purpose of clarity, are equal to 1 SD. Vertical lines and shaded areas represent the mean elemental concentration and ±1 SD on suspended particulate matter (SPM), respectively.

View larger version (63K): [in a new window]   Fig. 3. Selenium concentrations on particle-size separates and plant fraction in surface sediments from the Martinez Regional Park. The average median particle size in each habitat is shown.

View larger version (57K): [in a new window]   Fig. 4. Selenium normalized to Al in the top 1 cm sediment samples from both Martinez Regional Park (MRP) and Benicia State Park (BSP). Mean Se to Al ratios (±1 SD) on suspended particulate matter (SPM) and in Richardson Bay (RB) sediment cores are shown. Richardson Bay data represent pre-anthropogenic levels.

View larger version (28K): [in a new window]   Fig. 5. Elemental to Al ratios in Martinez Regional Park (MRP) and Benicia State Park (BSP) surface sediments, normalized to the mean suspended particulate matter (SPM) elemental to Al ratio. The organic matter fraction is also shown for both sites.

View larger version (26K): [in a new window]   Fig. 6. Total annual sediment flux at the Martinez Regional Park (MRP) and Benicia State Park (BSP) sites, based on sedimentation traps and sedimentation–erosion pins (February 1996–February 1997). Pin data from BSP are not shown.

View larger version (34K): [in a new window]   Fig. 7. Seasonal average concentrations of Se on sediment trapped in the marsh and tidal flats of Martinez Regional Park (MRP) (a) and Benicia State Park (BSP) (b).

View larger version (32K): [in a new window]   Fig. 8. Seasonal average organic matter (OM) content on sediment trapped in the marsh and tidal flats of Martinez Regional Park (MRP) (a) and Benicia State Park (BSP) (b).

View larger version (34K): [in a new window]   Fig. 9. Seasonal average concentrations of Al on sediment trapped in the marsh and tidal flats of Martinez Regional Park (MRP) (a) and Benicia State Park (BSP) (b).

View larger version (28K): [in a new window]   Fig. 10. Weight-averaged annual mean Se concentrations in trapped sediment and in the top 1 cm of sediment at Martinez Regional Park (MRP) (a) and Benicia State Park (BSP) (b), compared with the mean annual suspended particulate matter (SPM)-Se concentration. The standard deviations represent seasonal variation.

View larger version (51K): [in a new window]   Fig. 11. Weight-averaged annual mean Se concentrations in trapped sediment normalized to the mean Al concentration, and compared with mean Se to Al ratio (±1 SD) on suspended particulate matter (SPM) and in Richardson Bay (RB) sediment cores.