Benthic fluxes in San Francisco Bay

Hammond, Douglas E.; Fuller, Christopher C.; Harmon, Dana D.; Hartman, Blayne; Korosec, Michael; Miller, Laurence G.; Rea, Rebecca; Warren, Steven D.; Berelson, William M.; Hager, Stephen W.

doi:10.1007/978-94-009-5528-8_5

Cited by 21 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic matter content usually exceeded 10% (Table 1). These organic matter values were much higher than values observed in other estuarine sediments such as Long Island Sound (Mackin & Swider 1989), Buzzards Bay (Banta et al 1995), Chesapeake Bay (Roden & Tuttle 1993, Reay et al 1995 and San Francisco Bay (Hammond et al 1985, Caffrey 1995, where values range between 2 and 8%. Decomposition of this organic matter led to high pore water NH 4 + , DIP and S 2 -concentrations, particularly in the summer.…”

Section: Discussioncontrasting

confidence: 59%

“…Given the high nutrient inputs to Elkhorn Slough, further studies examining the role of benthic Benthic flux and pore water NH 4 + measurements from this study were similar to previous measurements in Elkhorn Slough (Caffrey 1996). SOC and NH 4 + flux from sites in Elkhorn Slough receiving agricultural and other non-point source runoff are among the highest recorded values from the literature (Nixon 1981, Hammond et al 1985, Mackin & Swider 1989, Enoksson et al 1990, Dollar et al 1991, Kamp-Nielsen 1992, Rizzo et al 1992, Upton et al 1993, Banta et al 1995, Lohse et al 1995, Reay et al 1995, Hopkinson et al 1999, Twilley et al 1999, Mortazavi et al 2000. In contrast, benthic fluxes from Vierra mudflat at the well-flushed mouth of Elkhorn Slough were similar to other estuarine and shallow coastal systems.…”

Section: Discussionmentioning

confidence: 73%

“…Benthic macrofauna can greatly enhance fluxes across the sedimentwater interface by bioturbation as well as excretion of NH 4 + (Hammond et al 1985, Mackin & Swider 1989, Peligri & Blackburn 1994, Banta et al 1995. Often the diffusion coefficient used in the diffusive flux calculation is increased to account for macrofauna bioturbation (Hammond et al 1985, Mackin & Swider 1989.…”

Section: Discussionmentioning

confidence: 99%

“…Often the diffusion coefficient used in the diffusive flux calculation is increased to account for macrofauna bioturbation (Hammond et al 1985, Mackin & Swider 1989. In general, benthic macrofauna were not very abundant at these sites (J. Caffrey pers.…”

Section: Discussionmentioning

confidence: 99%

“…These factors lead to large differences in nutrient and oxygen status of local environments, which can differ significantly from nearby sites and from the overall average conditions of the estuary. (Caffrey 1996), 7 San Francisco Bay (Hammond et al 1985, 8 Chesapeake Bay , Reay et al 1995, 9 Narragansett Bay (McCaffrey et al 1980, Seitzinger et al 1984, 10 Neuse River (Rizzo et al 1992), 11 North Sea (Upton et al 1993), 12 Bering Sea (Henriksen et al 1993), 13 Parker River (Hopkinson et al 1999), 14 Baltic Sea (Enoksson et al 1990, Jørgensen 1996b, 15 Ochlockonee Bay (Twilley et al 1999), 16 Mobile Bay (Twilley et al 1999), 17 Fourleague Bay (Twilley et al 1999), 18 Trinity-San Jacinto estuary (Twilley et al 1999), 19 Guadeloupe estuary (Twilley et al 1999), 20 Nueces estuary (Twilley et al 1999), 21 Laguna Madre (Twilley et al 1999), 22 Flax Pond (Mackin & Swider 1989) …”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Biogeochemical processes in a small California estuary. 1. Benthic fluxes and pore water constituents reflect high nutrient freshwater inputs

Caffrey¹,

Harrington²,

Ward³

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Elkhorn Slough, a small estuary in central California, receives nutrient inputs from agricultural and other non-point source runoff. To evaluate the effect of nutrient loading on ecosystem processes, rates of sediment oxygen consumption, benthic nutrient fluxes, pore water ammonium (NH 4 + ), dissolved inorganic phosphate (DIP) and sulfide (S 2 -) concentrations were measured at 5 sites several times each year between 1998 and 1999. Two sites near the head of the slough receive direct runoff from agricultural fields, while the sites in the middle reaches and mouth receive direct runoff from grasslands and woodlands. Sites receiving agricultural runoff usually had high water column concentrations of dissolved inorganic nitrogen and chlorophyll a (50 µM and 30 µg l -1 , respectively). High precipitation in the winter of 1998 caused low salinities in the slough at that time. In general, salinity and nutrient concentrations were inversely correlated. Sites receiving agricultural runoff had high pore water NH 4 + , DIP and dissolved S 2 -concentrations, particularly in the summer. Oxygen penetration into sediments was the greatest at the sites adjacent to grasslands and woodlands, and least at the sites receiving high nutrient runoff. Sediment oxygen consumption was 4 times greater at sites near agricultural fields than the site near the mouth, while NH 4 + flux out of sediments was between 4 and 20 times greater at agricultural sites than at non-agricultural sites. This study suggests that high nutrient runoff has primarily a local rather than estuary-wide effect on sediment biogeochemical processes in Elkhorn Slough, perhaps due to longer water residence time at the head of the slough compared to the mouth. KEY WORDS: Estuary · Eutrophication · Nutrients · Oxygen · Elkhorn SloughResale or republication not permitted without written consent of the publisher

show abstract

Section: Discussioncontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Biogeochemical processes in a small California estuary. 1. Benthic fluxes and pore water constituents reflect high nutrient freshwater inputs

Caffrey¹,

Harrington²,

Ward³

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

Spatio-temporal variability in benthic mineralization processes in the eastern English Channel

Rauch

Denis

2008

Biogeochemistry

View full text Add to dashboard Cite

The effect of phytodetritus derived from Phaeocystis sp. bloom on benthic mineralization processes has been determined at four intertidal stations along the French coast of the eastern English Channel. Sites were chosen to offer a diversity of sediment types, from permeable sandy beach to estuarine mudflats. Sediment Oxygen Demand (SOD) as well as total fluxes of Dissolved Inorganic Nitrogen (DIN) at the sediment-water interface were determined by using whole core incubation technique and diffusive fluxes were predicted from interstitial water concentrations. In the absence of phytodetritus deposits, a marked gradient of granulometric characteristics and organic matter contents were observed, and resulted in more intensive mineralization processes in muddy sediments. Highly significant correlations (P \ 0.05) were evidenced between SOD and porosity, bacterial biomass, Organic Carbon and Organic Nitrogen, evidencing the direct link between sediment texture, organic matter accumulation and microbial activity. The spring bloom led to a massive input of organic matter in surficial sediments and mineralization rates significantly increased while higher DIN release towards the water column was observed. A modification of the mineralization pathways was evidenced but clearly depended on the sediment type. With a global view, benthic mineralization processes in the intertidal zone provided significant a part of DIN inputs in the coastal zone while water column was depleted in nutrients.

show abstract

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

2006

View full text Add to dashboard Cite

Water quality data from two different monitoring periods are used to evaluate the trophic state and effectiveness of various protective measures on the restoration of a eutrophic, coastal Mediterranean lagoon. Main protective measures included elimination of municipal/industrial raw wastewater discharges in the rivers outflowing to the lagoon, sediment/erosion control practices in the lagoon's drainage basin (i.e., construction of sediment/debris dams and grade control structures, reforestation and ban on livestock grazing), and reduction of fertilizer application quantities as a result of changes in crops. Water quality data include, among others, chlorophyll a, dissolved oxygen and nutrient concentrations, various physicochemical parameters, and transparency, measured during two monitoring periods, i.e., before and after (1998-99) implementation of protective measures. Rainfall depth for the two time periods was also available. Empirical equations were developed, from statistical analyses of the data, relating the water quality parameters during the two monitoring periods. These models help identify water quality trends. Based on the analyses, it seems that measures were effective in reducing sediments transported into the lagoon. However, the lagoon remains eutrophic to hypereutrophic, mostly due to phosphorus released in the water column from bottom sediments. Therefore, future restoration efforts should be directed towards the management of bottom sediments.

show abstract

Benthic fluxes in San Francisco Bay

Cited by 21 publications

References 23 publications

Biogeochemical processes in a small California estuary. 1. Benthic fluxes and pore water constituents reflect high nutrient freshwater inputs

Biogeochemical processes in a small California estuary. 1. Benthic fluxes and pore water constituents reflect high nutrient freshwater inputs

Spatio-temporal variability in benthic mineralization processes in the eastern English Channel

Water Quality Trends in a Coastal Lagoon Impacted by Non-point Source Pollution after Implementation of Protective Measures

Contact Info

Product

Resources

About