Annual cycle of dissolved silicate in Chesapeake bay: implications for the production and fate of phytoplankton biomass

Dj, Conley; Malone, TC

doi:10.3354/meps081121

Cited by 237 publications

(121 citation statements)

References 24 publications

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“…These features seem to be a regular feature of Nenriched ecosystems. The same result is reported in the Chesapeake Bay (Conley and Malone, 1992;D'Elia et al, 1992;Fisher et al, 1998). In spring, D 'Elia et al (1992) observed a potential P-limitation with rapid turnover rates for phosphate, while in summertime, the ratios fall well below the level at which potential N-limitation can occur.…”

Section: Discussionsupporting

confidence: 76%

“…In the same way, several studies have highlighted the hypothesis of Si-limitation for diatom growth in nitrate-rich coastal waters (Schelske and Stoermer, 1971;Schelske and Stoermer, 1972;Officer and Ryther, 1980;Smayda, 1989;Smayda and White, 1990;Maestrini and Graneli, 1991;Conley and Malone, 1992;Egge and Aksnes, 1992;Rabalais et al, 1996;Rahm et al, 1996). It is believed to cause a shift in species composition which may result in harmful phytoplankton blooms (Schelske and Stoermer, 1972;Smayda, 1989;Smayda and White, 1990;Maestrini and Graneli, 1991;Egge and Aksnes, 1992).…”

Section: Discussionmentioning

confidence: 99%

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Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000

Loyer¹,

Lampert²,

Ménesguen³

et al. 2006

Sci. Mar.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000

Loyer¹,

Lampert²,

Ménesguen³

et al. 2006

Sci. Mar.

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“…An example is the Chesapeake Bay where dissolved silicate concentrations and loading determine the magnitude of the diatom bloom during the spring, causes the collapse of the spring diatom bloom and leads to changes in floristic composition of phytoplankton communities (Conley & Malone, 1992) allowing for diatoms to be replaced by species not requiring dissolved silicate for growth. In the Bay of Brest, dissolved silicate limitation appears to be a relatively recent phenomena first observed in the 1990s, whereas prior to this time the Bay of Brest was primarily N limited (Del Amo et al, 1997).…”

Section: Nutrient Limitationmentioning

confidence: 99%

Biogeochemical nutrient cycles and nutrient management strategies

Conley¹

1999

Man and River Systems

173

154

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Nutrient loading by riverine input into estuarine systems has increased by 6-50 times for the N load from pristine conditions to present, whereas a 18-180 times increase has been observed in the P load. Reductions in the ratio of N to P delivery has also occurred with time. In a review of nutrient limitation in estuarine systems, it is shown that many estuarine systems display P limitation in the spring, switching to N limitation in the summer with some estuaries displaying dissolved silicate limitation of the spring diatom bloom. Historical and recent changes in nutrient loading and their effect on nutrient limitation have intensified the debate on the control of nutrient delivery to estuaries from both agricultural and point sources, and as to what nutrient (N or P) should be managed for in estuarine systems. It is hypothesized that potential reductions in P may help oxygen depletion especially in deep estuaries and reduce fast growing macrophytes such as Ulva sp., although P reductions probably will have little effect on summer chlorophyll concentrations, an important recreational management goal. Reductions in N loading should reduce summer chlorophyll concentrations and improve the conditions for submerged aquatic vegetation and thus improve ecosystem functioning. Finally, if only P reductions are pursued, that is if we are able to reduce P such that it is limiting year around in estuarine systems, it is likely that the export of N from estuarine systems would increase to the bordering N-limited marine systems, thus only exporting the problem of enhanced production with eutrophication.

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“…Nitrogen (N), phosphorus (P) and silica (Si) are essential elements controlling primary production in estuarine environments (Ryther & Dunstan 1971, Howarth 1988, Conley & Malone 1992. These cycles are interrelated by organic matter production and decomposition.…”

Section: Introductionmentioning

confidence: 99%

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.

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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

Annual cycle of dissolved silicate in Chesapeake bay: implications for the production and fate of phytoplankton biomass

Cited by 237 publications

References 24 publications

Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000

Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000

Biogeochemical nutrient cycles and nutrient management strategies

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

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