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Conference presentation
Benthic processes in south San Francisco Bay
Seventy-fifth annual meeting of the Pacific Division/ American Association for the Advancement of Science (San Francisco State University, San Francisco, California, 06/19/1994–06/24/1994)
1994
Abstract
Measurements of benthic processes over the last 13 years in South San Francisco Bay have spanned a range of hydrologic and water quality conditions. However, benthic fluxes of O₂, NH₄⁺ and NO₃⁻ have shown little variation. NH₄⁺ and NO₃⁻ flux during this period were relatively constant in magnitude and direction. Sediment O₂ consumption was lower in the early 1980s than in the early 1990s. The reason for this difference is unclear, but may be a result of methodology or a lower density of the tube dwelling Asychis elongata. Although dissolved inorganic phosphate fluxes generally have been close to zero, in fall, there is a net flux into the sediments. Dissolved Si fluxes were consistently out of the sediments, while dissolved organic carbon fluxes were large and exhibited shifts in direction. Compared with other estuarine and coastal systems, temperature was not a major control on benthic fluxes because of the small annual temperature range. Irrigation by macrofauna enhances O₂ consumption and may control NH/ fluxes in the shoals, where NH₄⁺ flux was correlated with the biomass of mollusks. Porewater profiles of NH₄⁺, TCO₂ and radon suggest that irrigation is important in controlling dissolved constituent concentrations. Organic inputs such as deposition of phytoplankton may also affect benthic fluxes. In the channel, NH₄⁺ flux was positively correlated to phaeopigment concentrations in sediments. Ratios of sediment O₂ consumption to DIN (NH₄⁺ + NO₃⁻) or DIP flux were very different than ratios of remineralization of organic matter with a Redfield ratio, and suggest that both denitrification and phosphorus burial were occurring at both locations.
Details
- Title
- Benthic processes in south San Francisco Bay
- Resource Type
- Conference presentation
- Conference
- Seventy-fifth annual meeting of the Pacific Division/ American Association for the Advancement of Science (San Francisco State University, San Francisco, California, 06/19/1994–06/24/1994)
- Copyright
- Permission granted to the University of West Florida Libraries by the author to digitize and/or display this information for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires the permission of the copyright holder.
- Identifiers
- 99380113396506600
- Academic Unit
- Biology; Center for Environmental Diagnostics and Bioremediation ; Hal Marcus College of Science and Engineering
- Language
- English