Consulta: subjectFacets:"Biodeposition"
Registros recuperados: 5
Data/hora: 07/06/2024 02:24:19

Bioturbation at the water-sediment interface of the Thau Lagoon: impact of shellfish farming
Provedor de dados: 5
Autores: Schmidt, Sabine; Gonzalez, Jean-louis; Lecroart, Pascal; Tronczynski, Jacek; Billy, Isabelle; Jouanneau, Jean-marie.
Quantifier les processus de remaniement sédimentaire procure une vision nouvelle du fonctionnement des écosystèmes benthiques de l'étang de Thau, lieu d'une importante production ostréicole. Afin d'évaluer les taux de bioturbation des sédiments de surface, des profils de deux traceurs radioactifs, le béryllium 7Be (T1/2 = 53 jours) et le thorium 234Th (T1/2 = 24.1 jours) ont été mesurés à partir de carottes sédimentaires prélevées entre décembre 2001 et décembre 2006. La sélection de plusieurs sites a permis de couvrir la diversité de l'étang de Thau : C4, T10, et T11 dans le bassin central, C5, T7 et T8 au niveau des secteurs ostréicoles, T2 et T4 à l'ouest du bassin, et T12 à l'est près de la zone industrielle. Le 234Th en excès (234Thxs ; i.e. apporté...
Tipo: Text
Palavras-chave: Mediterranean Lagoon; Radionuclides; Biodeposition; Sedimentation.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2584.pdf

Evolutions quantitatives et qualitatives du seston dans une claire à huîtres : relation avec la sédimentation et la biodéposition
Provedor de dados: 5
Autores: Sornin, Jean-marc; Delmas, Daniel; Deslous-paoli, Jean-marc.
Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne d'une augmentation de matière organique importante (jusqu'à 17 mg.1(-1). Pendant cette période, la sédimentation naturelle est supérieure à 350 g.m(-2).j(-1). La biodéposition (fèces + pseudofèces) suit l'évolution des capacités de rétention des huîtres. Dans ce type de bassin fermé, cette capacité est liée à la qualité des matières en suspension. En période estivale, les fortes teneurs en matière organique du seston (entre 5 et 17 mg.1(-1)) dispensent les mollusques...
Tipo: Text
Palavras-chave: Crassostrea gigas; Oysters; Biodeposition; Sedimentation; Suspension; Particulate organic matter; Crassostrea gigas; Huîtres; Biodéposition; Sédimentation; Suspension; Matière organique particulaire.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-7309.pdf

Effects of water viscosity upon ventilation and metabolism of a flatfish, the common sole Solea solea (L.)
Provedor de dados: 5
Autores: Couturier, Christine; Rouault, Alice; Mckenzie, David; Galois, Robert; Robert, Serge; Joassard, Lucette; Claireaux, Guy.
The French Atlantic coast contains large highly productive intertidal mudflats that are colonised by juveniles of numerous flatfish species, including the common sole (Solea solea, L.). These ecosystems are also heavily exploited by the shellfish farming industry. Intensive bivalve culture is associated with substantial biodeposition (1-6 t-dw ha(-1) day(-1)), which directly or indirectly contributes to increase exopolysaccharide (EPS) concentrations at the interface between water column and seabed. EPS are long-chain molecules organised into colloids, which influence rheological properties of water, particularly viscosity. Increased water viscosity had consequences for ventilatory activity of juvenile flatfish, whereby the minimal pressure required to...
Tipo: Text
Palavras-chave: EPS; Hypoxia; Metabolism; Water viscosity; Biodeposition; Solea solea.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2801.pdf

In situ suspension feeding behaviour of the pearl oyster, Pinctada margaritifera: combined effects of body size and weather-related seston composition
Provedor de dados: 5
Autores: Pouvreau, Stephane; Bodoy, Alain; Buestel, Dominique.
In situ clearance rate (CR) and biodeposition of the black pearl oyster, Pinctada margaritifera, were followed during several field experiments from 1996 to 1998 in the lagoon of Takapoto. Serial measurements of total particulate matter (TPM, mg l(-1)), particulate inorganic matter (PLM, mg l(-1)), and particulate organic matter (POM, mg l(-1)) were related to meteorological conditions, especially wind speed. As a general case, POM and PLM increased with wind speed. Nevertheless, PLM increased faster than POM so that the organic content (OC, %) of the TPM decreased progressively when wind speed increased. These TPM variations induced direct changes in feeding processes of P. margaritifera. CR (l h(-1)) averaged 22 l h(-1) for a pearl oyster of 1 g dry...
Tipo: Text
Palavras-chave: Biodeposition; Clearance rate; Seston; Filter feedings behaviour; Tropical lagoon; Tropical bivalve.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-382.pdf

Variations saisonnières in situ de la production et de la composition des biodépots de trois mollusques estuariens (Mytilus edulis, Crassostrea gigas, Crepidula fornicata)
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Sornin, Jean-marc; Heral, Maurice.
The biodeposition was quantified on the field with sediment traps. All over the year, the biodeposition was the lowest for Crepidula fornicata. Mytilus edulis rejected more biodeposits during winter, and Crassostrea gigas during spring and autumn. The percentage of organic matter sonsumed and digested was higher during summer. The constituttive elements of the digested organic matter was not always the same, all over the year. The energy content of the digest fraction was higher in spring. For Mytilus edulis the ration intake was higher in winter and spring, related with the gametogenetic ans spawning period. An analysis of the mineral constutents of the natural food was made.
Tipo: Text
Palavras-chave: Crepidula fornicata; Crassostrea gigas; Mytilus edulis; Digestibility; Biodeposition; Crepidula fornicata; Crassostra gigas; Mytilus edulis; Digestibilité; Biodéposition.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2691.pdf