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Registros recuperados: 8
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Action de l'épandage de carbonate de calcium en poudre (hydral) sur les vases des parcs à huîtres de la région de Fouras ArchiMer
Feuillet, Michelle; Gouleau, Dominique.
Certains parcs à huîtres du bassin charentais sont le siège d'une intense sédimentation de vase par suite des apports continentaux permanents, et du phénomène de filtration des eaux turbides par les huîtres (5 à 20 litres d'eau à l'heure,Loosanoff, 1958 ; Collier, 1959 ; Galtsoff, 1964) comme par les moules. Les tables supportant les poches d'huîtres sont de plus en plus ennoyées par les vases et il n'y a pratiquement que l'enlèvement manuel par hersage qui améliore la situation.
Tipo: Text
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-7154.pdf
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Action des epandages de craie (ou CaCO3) sur les vases des claires et des parcs ostreicoles. ArchiMer
Feuillet, Michelle; Gouleau, Dominique.
Tipo: Text Palavras-chave: Water quality; Mineralization; Mud; Oyster pond; Chalk spreeding.
Ano: 1977 URL: http://archimer.ifremer.fr/doc/1977/publication-1993.pdf
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Dynamic model of the short-term variability of microphytobenthic biomass on temperate intertidal mudflats ArchiMer
Guarini, Jean-marc; Blanchard, Gf; Gros, Philippe; Gouleau, Dominique; Bacher, Cedric.
In the present paper, we list and document the relevant behavioral and physiological processes controlling primary productivity of epipelic microalgae on intertidal mudflats in order to develop a simplified model. We first propose, in an attempt to characterize the 'photosynthetically active biomass' of the epipelic community, a new approach to describe the photic environment at the sediment surface, by substituting a discrete a-layer model in place of continuous vertical light distribution. This concept thus allows us to build a functional representation of the distribution of the photosynthetically active biomass in the sediment and, by then integrating the light and temperature forcing of the latter biomass, to predict the dynamics of the whole epipelic...
Tipo: Text Palavras-chave: Microphytobenthos; Intertidal mudflat; Primary production; Dynamic model; Migratory rhythm; Ecophysiological response.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10540/7601.pdf
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Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France) ArchiMer
Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that...
Tipo: Text Palavras-chave: Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-3820.pdf
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Effets de l'assèchement des bassins ostréicoles sur le cycle biogéochimique de nutriments azotés: ammonification préférentielle ArchiMer
Gouleau, Dominique; Feuillet-girard, Michelle; Germaneau, James; Robert, Serge.
Oyster ponds behave as organic matter accumulators, unlike wetlands which export a large part of their natural productivity towards the ocean as well as inorganic nitrogen towards the atmosphere through denitrification. Thus, to prevent eutrophication temporary drying-out is necessary, the physical effects of which are weIl known but who se biogeochemical processes are still poorly documented. The aim of the present study was to perform a drying -out operation in an oyster pond, and to describe the modifications which occurred within the nitrogen cycle: i.e. mineralization processes within the top 5 cm of the sediment; changes in nutrient pore-water concentrations; and fluxes through the water/sediment interface. Prior to the operation, ammonia was the...
Tipo: Text
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00017/12789/9730.pdf
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Nutrient fluxes on an intertidal mudflat in Marennes-Oleron Bay, and influence of the emersion period ArchiMer
Feuillet-girard, Michelle; Gouleau, Dominique; Blanchard, Gérard; Joassard, Lucette.
Fluxes of nutrients (NH sub(4) super(+), NO sub(3) super(-), PO sub(4) super(3-) and Si(OH) sub(4)) were studied on an intertidal mudflat in Marennes-Oleron Bay, France, at two different seasons and at different times of the emersion period. Fluxes through the sediment-water interface were both calculated from vertical profiles of nutrient concentration in pore-water (diffusive fluxes, JD) and measured in light and dark benthic mini-chambers (measured fluxes, J sub(0)). Results indicate that ammonia was mainly released in summer while nitrate was mainly taken up in late winter. This uptake from the overlying water was probably due to the coupling of nitrification-denitrification within the sediment. The J sub(0) /J sub(D) ratio further indicates that...
Tipo: Text Palavras-chave: Estran vaseux; Flux de nutriments; Microphytobenthos; Bioturbation; Marennes-Oléron; Intertidal mudflat; Nutrient fluxes; Microphytobenthos; Bioturbation; Marennes-Oleron Bay.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00038/14893/12220.pdf
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Stimulation de la productivité naturelle par enrichissements minéraux et organiques : étude en mésocosmes naturels ArchiMer
Hussenot, Jerome; Castel, J; Fardeau, Jean-claude; Feuillet-girard, Michèle; Gautier, Dominique; Gouleau, Dominique; Legrand, C; Martin, Jean-louis; Pirastru, L; Ravail, Brigitte; Rince, Y; Sautour, Benoit.
Il a été étudié sur 9 bassins de terre expérimentaux de 200 m3, à l'état initial identique, l'influence de 2 types de stimulation sur les populations naturelles planctoniques et benthiques et sur la qualité physico-chimique de I'eau et du sédiment en comparaison avec des bassins de référence non stimulés.
Tipo: Text Palavras-chave: Marais aquacoles; Productivité naturelle; Fertilisants.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00020/13115/10124.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
Registros recuperados: 8
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