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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

Gilbert, Franck and Souchu, Philippe and Bianchi, Micheline and Bonin, Patricia Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France. (1997) Marine Ecology Progress Series, 151. 143-153. ISSN 0171-8630

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Official URL: http://dx.doi.org/10.3354/meps151143

Abstract

The seasonal patterns of nitrification, denitrification and dissimilatory ammonium production (DAP) rates were studied in the sediment of 2 stations in the Thau lagoon (south of France). The station ZA was located within the shellfish farming zone and thestation B was the reference site. A marked effect of shellfish farming on bacterial activities was observed. Spatial differences were associated with discrepancies in the organic content and the reduction state of sediments, i.e. highest reductive processes (denitrification and DAP) were noted in shellfish farming area, whereas the oxidative process (nitrification) was predominant outside the farming zone. At both stations, the DAP activity increased in September (autumn) concomitant with an increase of the C/N ratio in the sediment due to the sedimentation of the summer phytoplanktonic production. Nitrification and denitrification rates exhibited maxima in November (winter) corresponding to dissolved inorganic nitrogen inputs from the surrounding land. In the shellfish farming site, 98% of nitrate was reduced to NH4+ and 2% to N2O, showing that the most of the NO3- was reduced to ammonium and remained available for the ecosystem.

Item Type:Article
Additional Information:Thanks to Inter Research editor. The definitive version is available at http://www.
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
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Deposited By: Franck Gilbert
Deposited On:05 Apr 2013 07:20

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