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	Provedor de dados ArchiMer (1) RChHN (1) Autor Bianchi, M (1) Bonin, P (1) Gilbert, F (1) MUÑOZ,PRAXEDES (1) NEIRA,CARLOS (1) SALAMANCA,MARCO A (1) SELLANES,JAVIER (1) Souchu, Philippe (1) Mais... Palavra-chave Sediment-water exchanges (2) Ammonia (1) Coastal upwelling (1) Denitrification (1) El Niño event (1) Mediterranean Sea (1) Nitrate reduction to ammonium (1) Nitrification (1) Nitrogen bacterial processes (1) Pore-water nutrients (1) Shellfish farming (1) Thau lagoon (1) Mais... Tipo do documento Journal article (1) Text (1) Ano 2004 (1) 1997 (1) País Chile (1) France (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France ArchiMer Gilbert, F; Souchu, Philippe; Bianchi, M; Bonin, P. 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 the station B was the reference site. A marked effect of shellfish fanning 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... Tipo: Text Palavras-chave: Shellfish farming; Nitrogen bacterial processes; Nitrification; Nitrate reduction to ammonium; Denitrification; Thau lagoon; Mediterranean Sea; Sediment-water exchanges. Ano: 1997 URL: http://archimer.ifremer.fr/doc/00070/18145/15697.pdf Nitrogen sediment fluxes in an upwelling system off central Chile (Concepción Bay and adjacent shelf) during the 1997-1998 El Niño RChHN MUÑOZ,PRAXEDES; SALAMANCA,MARCO A; NEIRA,CARLOS; SELLANES,JAVIER. Two stations representing coastal and shelf environments (bay of Concepción and adjacent shelf, respectively) were sampled in order to assess benthic nitrogen fluxes. During the study period anomalously high oxygen bottom waters conditions were observed, coinciding with the 1997-1998 El Niño event. From both sites, intact sediment cores were collected for incubation experiments to directly estimate total ammonium fluxes. Pore-water chemistry was also assessed to estimate diffusive fluxes of nitrogen compounds (NH4+, NO3- and NO2-). The NH4+ flux from incubation experiments ranged from 0.55 to 2.18 mmol m-2 day-1 in the inner bay and from 1.84 to 2.14 mmol m-2 day-1 on the shelf. NO3- diffusive fluxes to the sediments were observed in the bay in March (-17... Tipo: Journal article Palavras-chave: Ammonia; Pore-water nutrients; Sediment-water exchanges; Coastal upwelling; El Niño event. Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200009 Registros recuperados: 2 Primeira ... 1 ... Última

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