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Temporal variability in dissolved inorganic nitrogen fluxes at the sediment-water interface and related annual budget on a continental shelf (NW Mediterranean) ArchiMer
Denis, Lionel; Grenz, Christian; Alliot, Elisabeth; Rodier, Martine.
Sediment-water dissolved inorganic nitrogen fluxes were measured monthly between November 1997 and January 1999 at two sites on the continental shelf in the Gulf of Lions. Exchanges of ammonium, nitrate and nitrite were measured using whole core incubations performed in the laboratory at in situ temperature and in the dark;. Stations were located on the shelf and near the shelf break. Nitrate release represented the major part of total dissolved inorganic nitrogen fluxes (52-98%). At station Soft, nitrate flux doubled from winter-early spring to August (4 to 10 mu mol m(-2) h(-1)). At station R, a large increase (2 to 14 mu mol m(-2) h(-1)) was recorded between December 1997 and January 1998, after which flux tended to decrease. Ammonium flux was generally...
Tipo: Text Palavras-chave: Flux à l’interface eau–sédiment; Azote inorganique dissous; Variabilité temporelle; Cycle de l’azote; Méditerranée nord occidentale; Sediment-water flux; Dissolved inorganic nitrogen; Temporal variability; Nitrogen cycling; NW Mediterranean.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00323/43371/42839.pdf
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Oxygen fluxes involving the benthic micro- and macrophytic components in the Thau Lagoon under pre-anoxic conditions ArchiMer
Plante Cuny, Marie-reine; Plante, Raphaël; Mazouni, Nabila; Fontaine, Marie-france; Souchu, Philippe; Deslous-paoli, Jean-marc; Grenz, Christian.
Measurements of oxygen fluxes at the water-sediment interface (transparent and opaque enclosures) were made on bare sediments inhabited by microphytes on the one hand, and on sediments diversely colonized by macrophytes (macroalgae and seagrasses) on the other hand. Five stations, typical of different biotopes of a Mediterranean shallow lagoon were studied from May to July 1993 in order to observe an anoxic event which usually occurs at that time of the year. Average diurnal respiration of benthic communities ranged from 40 mg (or 1.25 mmol) O-2 m(-2) h(-1) in bare sediments (31 % of the lagoon area) to 76 mg (or 2.37 mmol) O-2 m(-2) h(-1) in sediments with a medium coverage of macroalgae (37 % of the total area) and, finally, to 100 mg (or 3.12 mmol) O-2...
Tipo: Text Palavras-chave: Thau France; Mediterranean coastal lagoon; Micro macrophytobenthos; Oxygen fluxes; Thau (France); Lagune côtière méditerranéenne; Micro macrophytobenthos; Flux d'oxygène.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-839.pdf
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Quantification et destinée de la biodéposition en zones de production conchylicole intensive en Méditerranée ArchiMer
Grenz, Christian.
L'étude des processus de transferts de matière et d'énergie dans les écosystèmes côtiers a été abordée par le biais de l'analyse du fonctionnement des écosystèmes conchylicoles où ces transferts sont amplifiés en raison d'une très forte biomasse monospécifique, concentrée dans un espace restreint. La biodéposition représente le vecteur principal de transfert entre le compartiment pélagique ou benthique "suspendu" et le compartiment benthique sensu stricto. Dans les conditions typiquement méditerranéennes, les études concernant l'émission des fèces et pseudo-fèces sont rares. Pour combler cette lacune et apporter un élément supplémentaire à la connaissance du fonctionnement de tels écosystèmes, une étude in situ de la biodéposition a été entreprise dans...
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Ano: 1989 URL: http://archimer.ifremer.fr/doc/00073/18420/15961.pdf
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