Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France

Gilbert, Franck; Souchu, Philippe; Bianchi, Micheline; Bonin, Patricia

doi:10.3354/meps151143

Cited by 137 publications

(96 citation statements)

References 33 publications

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“…The range of potential denitrification was 13-828 ng N g -1 h -1 (mean ± SE = 417 ± 153 ng N g -1 h -1 ). These potential denitrification rates were similar to the maximum rate (V max ) found by Billen (1978) in North Sea sediments, and are comparable with denitrification rates in Delaware Inlet, New Zealand (Kaspar 1983), Chesapeake Bay (Kana et al 1998), Aarhus Bight, Denmark (Nielsen & Glud 1996), and Tomales Bay, California (Joye & Pearl 1994), but considerably less than in enriched estuaries such as the Great Ouse, England (Trimmer et al 1998), the Neuse River, North Carolina (Rizzo & Christian 1996), and around the Gulf of Mexico (RiveraMonroy & Twilley 1996;Flemer et al 1998), or Northern Hemisphere areas associated with intensive shellfish farming such as Thau Lagoon, France (Gilbert et al 1997).…”

Section: Nitrification/denitrificationmentioning

confidence: 84%

Nutrient cycling and fluxes in Beatrix Bay, Pelorus Sound, New Zealand

Gibbs

Ross

Downes³

2002

New Zealand Journal of Marine and Freshwater Research

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Nitrogen (N) and light availability limit phytoplankton growth and hence regulate food supply for mussel farming in Pelorus Sound, New Zealand. In Beatrix Bay, a large 35-m deep embayment off Pelorus Sound, the supply of N is heavily influenced by physical factors. Bottom intrusions of N-rich or depleted oceanic water occur in the main channel of Pelorus Sound and Ndepleted, phytoplankton-enriched Pelorus River water characterises the near-surface low salinity field. Inside Beatrix Bay, nutrient cycling via phytoplankton uptake, sedimentation, and subsequent regeneration from the sediments by mineralisation, also has an important influence on the availability of N in the water column. However, almost continuous salinity or thermally induced density stratification, or both, within Beatrix Bay meant that the upper and lower water columns were often decoupled so that N regenerated from the sediments was not readily available in the upper water column, and phytoplankton settling from the upper water column may not reach the sediments directly below because of large horizontal transport. The N supply in the upper water column of Beatrix Bay, where the mussels are farmed, is most likely regulated by advection in and out of the bay from external sources. Conversely, the N concentrations below the pycnocline could be almost entirely supplied via mineralisation from the sediments. The rates of sediment N regeneration were seasonally dependent. During winter, when sedimentation exceeds mineralisation, N accumulates in the sediments at a rate of up to 10 mg m -2 day -1 , whereas in summer, when mineralisation exceeds sedimenation, N is lost from the sediments at rates of up to 9 mg m -2 day -1 .

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Section: Nitrification/denitrificationmentioning

confidence: 84%

Nutrient cycling and fluxes in Beatrix Bay, Pelorus Sound, New Zealand

Gibbs

Ross

Downes³

2002

New Zealand Journal of Marine and Freshwater Research

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“…This situation is likely to favour benthic flora but also pelagic nitrifying bacteria, although the former can be inhibited by light in summer (Ward 1985). Early autumn is often characterised by an increase of NH 4 + concentration, probably due to the decay of summer communities in the water column (Gilbert et al 1997). In October (Fig.…”

Section: Discussionmentioning

confidence: 99%

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Souchu

Vaquer²,

Collos³

et al. 2001

Mar. Ecol. Prog. Ser.

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144

108

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Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges. The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time. In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by only a few percent of oxygen concentrations in their vicinity, but the mean (± SE) deficits of chlorophyll a and POC concentrations were 44 ± 4% and 26 ± 9% respectively in the eastern zone (8 m). The shift induced by filter feeders in phytoplankton composition favoured picophytoplankton with higher growth rates. But the summer increase in phytoplankton growth rate was stronger than the positive feedback due to filter feeder filtration. Summer was determinant for the growth of oysters owing to enhanced regenerated primary production. During this period, filter feeders were not food limited, while they tended to control phytoplankton biomasses and production the rest of the year. The nutrient excess in shellfish farming zones was highly significant, with increases of 73 ± 16, 36 ± 12 and 19 ± 8% for ammonia, phosphates and silicate respectively in the eastern zone. In the western zone, the nutrient excess was less strong by half for ammonia and phosphate, because the lower depth (4 m) allows light to reach the bottom and enables benthic macroflora to grow on nutrients of benthic origin. The decline of phytoplankton biomasses in shellfish farms induced a decrease in the nutrient demand, especially for ammonia. This situation was likely to favour nitrification, which led during autumn to higher nitrate concentrations within shellfish farming zones than outside. Therefore, filter feeders were able to alter the dominant biogeochemical process in the water column by stimulating nitrification. KEY WORDS: Suspension-feeding bivalves · Phytoplankton · Nutrient cycling · Carrying capacity · Thau lagoonResale or republication not permitted without written consent of the publisher

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“…The Thau Lagoon in southern France is characterized by shellfish farming and a responsive drainage basin. In this lagoon, the changes in environmental conditions associated with shellfish farming and runoff from land strongly influence the nitrogen cycle at the sediment -water interface (Gilbert et al 1997). The seasonal and spatial variations of sedimentary oxygen distributions appeared strongly related to the carbon input and temperature variations .…”

Section: Abstract: Nitrogen Dynamics · Carbon · Oxygen · Coastal Sedmentioning

confidence: 99%

Coupling of carbon, nitrogen and oxygen cycles in sediments from a Mediterranean lagoon: a seasonal perspective

Dedieu¹,

Gilbert²,

Soetaert³

et al. 2007

Mar. Ecol. Prog. Ser.

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International audienceExperimental data and simulations were used to investigate the seasonal coupling between carbon, nitrogen and oxygen cycles in marine sediments from a eutrophic shallow lagoon in the Mediterranean Sea area. A negative seasonal correlation was observed between oxygen consumption and coupled nitrification–denitrification rates in surface sediments. Elevated values of oxygen consumption rates were reached during warm periods (up to 87.7 mmol m–2 d–1) whereas nitrification and denitrification rates remained close to the lowest rates reported for coastal sediments (values around 0.021 to 0.35 mmol N m–2 d–1 for nitrification and 0.014 to 0.045 mmol N m–2 d–1 for denitrification). A steady-state diagenetic model closely represented the seasonal negative correlation of oxygen uptake, coupled nitrification–denitrification rates, the vertical distribution patterns of pore water oxygen and the solid phase distribution of organic carbon when nitrification inhibition by sulfide was included. Simulation adjusted to field data also highlighted the importance of oxygen penetration depth in the seasonal variation of nitrification. The modelling indicated that anaerobic metabolism was the most significant pathway (65 to 80%) during organic matter mineralization with a clear seasonal increase during warm periods. These warm periods were also characterized by the higher benthic demand of oxygen mostly used to re-oxidize the by-products from anaerobic reactions (from 57 to 82%), the other part being used for carbon mineralization

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Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France

Cited by 137 publications

References 33 publications

Nutrient cycling and fluxes in Beatrix Bay, Pelorus Sound, New Zealand

Nutrient cycling and fluxes in Beatrix Bay, Pelorus Sound, New Zealand

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Coupling of carbon, nitrogen and oxygen cycles in sediments from a Mediterranean lagoon: a seasonal perspective

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