Influence of oyster culture on biogeochemistry and bacterial community structure at the sediment-water interface
Bacterial community structure and some biogeochemical parameters were studied in the sediment of two Pacific oyster farming sites, Aber Benoît (AB) and Rivière d'Auray (RA) in Brittany (France), to examine the ecological impact of oysters and to evaluate the emission of sulfide and ammonia from sediment. At AB, the organic matter accumulated in the sediment beneath the oyster tables was rapidly mineralized, with strong fluxes of ammonia and sulfide that reached 1014 ?mol m?2 h?1 - and 215 ?mol m?2 h?1, respectively, in June 2007. At RA, the fluxes were about half as strong on average and better distributed through the year. The ammonia and sulfide concentrations in the overlying water never reached levels that would be toxic to oysters in either site, nor did hypoxia occur.
Total culturable bacteria (TCB) varied greatly according to the temperature: from 1.6 104 to 9.4 107.cell g?1 sediment. Inversely, the bacterial community structure remained surprising stable through the seasons, marginally influenced by the presence of oysters and by temperature. Bacterial communities appeared to be characteristic of the sites, with only one common phylotype, Vibrio aestuarianus a potential oyster pathogen. These data refine the hypothesis of seawater toxicity to oysters due to ammonia and sulfide fluxes and show that the measured environmental factors only had a weak influence on bacterial community structure.
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|keyboard_arrow_right||Titre :||Influence of oyster culture on biogeochemistry and bacterial community structure at the sediment-water interface|
|keyboard_arrow_right||Type de documentation :||Articles|
|keyboard_arrow_right||Auteur(s) personne(s) :||Nicolas, Jean-louis , Philippon, Xavier , Kerouel Roger, Andrieux-Loyer Françoise, Poly, Franck , Azandegbe, Afi|
|keyboard_arrow_right||Date de publication :||20 octobre 2012|
|keyboard_arrow_right||Editeur(s) :||John Wiley & Sons|
|keyboard_arrow_right||Tags thématiques :||eaux côtières, qualité de l'eau, sédimentologie|
|keyboard_arrow_right||Mots-clés libres :||sediment/biogeochemical parameters/fluxes/bacterial structure/Crassostrea gigas|
|keyboard_arrow_right||Localisation :||FINISTERE, MORBIHAN|
|keyboard_arrow_right||N° d'édition (ISBN,DOI...) :||10.1111/j.1574-6941.2012.01410.x|
|keyboard_arrow_right||Collection :||FEMS Microbiology Ecology|