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In situ estimations of uptake and release of material by oysters in the Bay of Marennes-Oléron (France) ArchiMer
Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert.
The uptake and release of material by oysters (Crassostrea gigas) in the intertidal zone were estimated in situ in the Bay of Marennes-Oléron (France) in spring and autumn. 10 m long plexiglass tunnels were placed over small tables with bags containing oysters or empty oyster shells (control). Although in the very turbid conditions of the water column sedimentation of suspended particulate material could be observed in control experiments, higher fluxes (uptake) of seston, POC and PON and especially chlorophyll occurred in the presence of live animals. Release of dissolved nutrients was not evident from the tunnel with oysters, which is in contrast with studies in other areas with bivalves. This is ascribed to limited mineralization of biodeposits as an...
Tipo: Text Palavras-chave: Chlorophyll; Seston; Oysters; Nutrient release; Material uptake.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-6842.PDF
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Seston dynamics and bivalve feeding in the Bay of Marennes-Oléron (France) ArchiMer
Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert.
Within the framework of an investigation into the carrying capacity of the Bay of Marennes-Oléron (France) for bivalve culture, the in situ uptake of suspended particulate material by oysters (Crassostrea gigas) and mussels (Mytilus edulis) was determined in experiments with benthic ecosystem tunnels. Very high fluctuations in seston quantity and quality were observed within and between tidal cycles. The percentage of organic carbon was inversely related to seston quantity at low concentrations. Organic carbon was diluted by resuspension of material rich in inorganic matter. At high seston concentrations a constant level of about 2% organic carbon was found. The CIN ratio was relatively constant throughout the seasons and fairly low (6.5 to 8.4). Owing to...
Tipo: Text Palavras-chave: Microphytobenthos; Chlorophyll; Feeding; Mussel; Oyster; Seston quality; Seston load.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-6843.PDF
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The measurements of nutrient fluxes at the water-sediment interface : incubation methods (in laboratory and in situ) ; gradient method (calculated fluxes) ; benthic ecosystem tunnel ArchiMer
Feuillet-girard, Michelle; Gouleau, Dominique; Zurburg, Wouter; Small, A. C.; Dankers, N.; Heral, Maurice.
Many flux measurements methods have been described in the literature. The purpose of our study was to compare results obtained by these different methods : gradient method, incubation method (Laboratory and in situ), benthic ecosystem tunnel. The field experiment has been performed in the Marennes Oleron Bay since May 1991 (Contrat C. E. E. FAR)
Tipo: Text Palavras-chave: Nutrient fluxes; Measurements; Methods; Incubation; Benthic ecosystem tunnel; Marennes Oleron; Charente Maritime.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00102/21304/18923.pdf
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