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Les facteurs de verdissement de l'huître en claires : le milieu hydrobiologique et benthique et ses variations ArchiMer
Moreau, Jean.
In a preliminary work (MOREAU, 1967), the importance of the role of pigments in fattening ponds and the part they played in the process of Navicula ostrearia B.'s pigmentation had been studied in fattening ponds situated at two different points of the Marennes-Oléron basin. The first of these fattening ponds were located in the Seudre Valley, at La Tremblade and at Eguillate, the second ones in the Daire area more widely fed by coastal waters and where the greening conditions of the fattening ponds are different from those observed in Seudre (figure 1 and table 1). 370 Dosing the potency of various chlorophylls had highlighted a noticeable constancy of chlorophyll B and, a variance for those of type A and C (table 2) which had made it possible to conclude...
Tipo: Text Palavras-chave: Marennes Oléron; Navicula ostrearia; Pigment; Facteurs; Verdissement; Claire à huîtres.
Ano: 1968 URL: http://archimer.ifremer.fr/doc/1968/publication-2982.pdf
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Recherche préliminaires sur le verdissement en claires : l'évolution de leurs divers pigments liée au complexe pigmentaire de Navicula ostrearia Bory ArchiMer
Moreau, Jean.
The greening of oysters in fattening ponds, known of since SPRAT (1669), was made clear by GAILLON (1820) who described "the green coloration that oysters placed in basins acquired" and observed that this coloration was localised particularly in the gills. He specified the agent of this phenomenon, which he call Vibrio ostrearia, a spindle-shaped organism, about 100µ long, placed since then in the genus Navicula by BORV DE SAINT-VINCENT (1823). The pigment emitted by this navicular, classified today as one of the Pennales, was called "Marennine" in 1886 by RAY-LANCASTER.
Tipo: Text Palavras-chave: Marennes Oléron; Charente Maritime; Navicula ostrearia; Verdissement; Claire à huîtres.
Ano: 1967 URL: http://archimer.ifremer.fr/doc/1967/publication-2981.pdf
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Production des micro-algues des claires ostréicoles en relation avec l'azote organique dissous excrété par les huîtres ArchiMer
Robert, Jean-michel; Maestrini, Serge; Heral, Maurice; Zanette, Yvan.
Estimations of algal growth potential (AGP) of oyster-pond waters have been made by the use of bioassays and nutrient analysis. Data obtained demonstrated that nitrogen is the nutrient Iimiting AGP and that an important part of algal biomass is supported by organic nutrients. Such an uptake ranges from 0.6 to 30.7 µg-at.I-1 nitrogen ; which represents up to six times the total amount of inorganic nitrogen taken up. U.V oxydation and subsequent chemical analysis shown DON concentrations in oyster-pond waters varied with oyster presence or absence: values recorded were 10-40 µg-at N.I-1 when oysters were not present, and up to 50-60 µg-at N.I-1 when oysters were covering the bottom of the pond. The oyster Crassostrea gigas was demonstrated to excrete 77-93 %...
Tipo: Text Palavras-chave: Photoheterotrophy; Excretion by oysters; Dissolved organic nitrogen; Yield index; Oyster pond; Photohétérotrophie; Excrétion de l'huître; Azote organique dissous; Indice de fertilité; Claire à huîtres.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/acte-2946.pdf
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