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Registros recuperados: 67 | |
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Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc. |
Le bassin conchylicole de Marennes-Oléron assure 40 % des 100 000 tonnes d ' huîtres commercialisées annuellement en moyenne en France (20 000 emplois, 1 milliard de chiffre d'affaire) . La modélisation des équilibres qui s'établissent entre l es stocks mis en culture , et la production annuelle , réalisée par la station IFREMER de La Tremblade , a mis en évidence les résultats suivants : Lorsque la biomasse augmente : a) La production plafonne vers 40 000 tonnes pour une biomasse de l'ordre de 80 000 tonnes avec l'huître japonaise, ce qui correspond à une biomasse équivalente de 130 000 tonnes d'huîtres portugaises. b) La durée du cycle de production d'une huître de 70 g passe de 2 ans à 4 ans. c) Les mortalités courantes passent simultanément de 20 % à... |
Tipo: Text |
Palavras-chave: Production; Ostréiculture; Biomasse; Modélisation; Marennes Oléron. |
Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00048/15909/13338.pdf |
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Deslous-paoli, Jean-marc; Masse, Henri. |
Hundred and ten samplings were made in the bay of Marennes Oleron, during the summer 1981. They allow to localize the hight loads of Crepidula fornicata in the middle of the bay (along the mud-bank of Charret and in the courante d'Oleron°. In this two Points, we value the dry biomass at about 2,3 kg/m2 on the mud-bank of Charret and at 1,1 kg/m2 in the courante d'Oleron. The weight present on this two banks (about 550 000 m2) is approximatively 700 tons of slipper limpets. The mean growth rate is 20, 19, 17 and 12 mm respectively on the 1"-, 2n ,3rd and 4th year with a very important variability since the first year. 74,5 %of the individuals form the main chains (mean of 6 slipper limpets) attached on shells of dead slipper limpets. Some solutions of... |
Tipo: Text |
Palavras-chave: France; Marennes Oleron; Geographical repartition; Crepidula fornica; Répartion géographique; Marennes Oléron; Crepidula fornicata; Crépidules. |
Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/1982/acte-2950.pdf |
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Bacher, Cedric; Heral, Maurice; Deslous-paoli, Jean-marc; Razet, Daniel. |
The growth of oysters (Crassostrea gigas) is modeled in order to study the trophic capacity of the Bay of Marennes Oléron. Total seston and amount of protids, lipids, and carbohydrates converted to energy are the environmental factors taken into account. Time series of these variables are derived during 2 yr with a daily time step from a linear regression including the tidal velocity, the height of the water column, and the wind velocity. A model of the energetic budget based on assimilation and respiration terms and depending on the previous time series is run to simulate the individual growth of an oyster. The knowledge of the number of oysters, the flow of water entering the bay, and the volume of the bay allows us then to estimate that 7% of the... |
Tipo: Text |
Palavras-chave: Marennes Oléron; Crassostrea gigas; Huîtres; Croissance; Modélisation; Marennes Oleron bay; Crassostrea gigas; Oysters; Growth; Modelisation. |
Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/publication-3051.pdf |
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Feuillet-girard, Michelle; Heral, Maurice; Sornin, Jean-marc; Deslous-paoli, Jean-marc; Robert, Jean-michel; Mornet, Francoise; Razet, Daniel. |
The respective influences of the sediment and of oyster (Crassostrea gigas) farming on the accumulation and the recycling of different forms of organic and inorganic nitrogen are described. Fluxes of dissolved inorganic and organic forms of nitrogen were studied between the water column, the water overlying the sediment and the pore waters, while for particulate forms the fluxes were studied between suspended material, the "biodeposits" (faeces and pseudofaeces of Crassostrea) and the sediment. The flux of inorganic nitrogen amounts to 10.5 106 g.m(-2). Yr(-1), while that of organic nitrogen is half this figure. The particulate flux is 15.106 g.m(-2).yr(-1). On the other hand, the phytoplanktonic nitrogen accounts for only 6% of the total particulate... |
Tipo: Text |
Palavras-chave: Marenne Oleron; Sediment; Pore water; Interface; Crassostrea gigas; Nitrogen; Marennes Oléron; Sédiment; Eau interstitielle; Adsorption; Interface; Crassostrea gigas; Azote. |
Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/1988/publication-2878.pdf |
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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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Deslous-paoli, Jean-marc. |
Contrairement aux U.S.A., où ils ne représentent que 4,6% de la production marine totale (Chew & Donaldeson, 1985), les productions de mollusques principalement bivalves ne peuvent plus être considérées comme marginales. En France, 100 000 tonnes d'huîtres dont 98% de Crassostrea gigas (Héral & al. 1985) et 85 000 tonnes de moules (Mytilus edulis, Mytilus galloprovinciallis) (Dardignac, 1985) sont produites annuellement. Par ailleurs, de nouveaux élevages se développent, tel ceux des Pectinicidae et de Ruditapes philippinarum sur les côtes atlantiques et méditerranéennes... |
Tipo: Text |
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Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00392/50356/51057.pdf |
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Plus, Martin; Chapelle, Annie; Menesguen, Alain; Deslous-paoli, Jean-marc; Auby, Isabelle. |
A numerical deterministic model for a seagrass ecosystem (Zostera noltii meadows) has been developed for the Thau lagoon. It involves both above- and belowground seagrass biomasses, nitrogen quotas and epiphytes. Driving variables are light intensity, wind speed, rain data and water temperature. This seagrass model has been coupled to another biological model in order to simulate the relative contributions of each primary producer to: (i) the total ecosystem production, (ii) the impact on inorganic nitrogen and (iii) the fluxes towards the detritus compartment. As a first step in the modelling of seagrass beds in the Thau lagoon, the model has a vertical structure based on four boxes (a water box on top of, three sediment boxes) and the horizontal... |
Tipo: Text |
Palavras-chave: Thau lagoon; Nitrogen cycle; Oxygen cycle; Box model; Seagrass ecosystem. |
Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/2003/publication-461.pdf |
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Hebert, M.; Dupre, Nicolas; Barral, M.; Messiaen, Gregory; Oheix, Jocelyne; Deslous-paoli, Jean-marc; Roque D'Orbcastel, Emmanuelle; Laugier, Thierry. |
OBJECTIF DU PROGRAMME - L’objectif de ce projet sur la réimplantation d’herbiers de phanérogames est d’étudier la faisabilité technique et la définition des conditions optimales de réimplantation des herbiers, à petite échelle dans un premier temps (14 m2par site). Les conclusions de cette étude permettront d’étudier la pertinence de poursuivre sur une seconde phase à plus grande échelle. Trois lagunes, caractérisées par un niveau d’eutrophisation compatible avec la réimplantation d’herbiers, ont été sélectionnées pour le projet : l’étang d’Ingril, l’étang de Thau et l’étang de Bages-Sigean . |
Tipo: Text |
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Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00089/20062/17703.pdf |
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Registros recuperados: 67 | |
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