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| Registros recuperados: 56 | |
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| Rocha, Gra; Rossi-wongtschowski, Cldb; Pires-vanin, Ams; Jarre-teichmann, A. |
| Planktonic and benthic productivity and consumption were estimated to assess the availability of food to higher trophic-level consumers in the Ubatuba ecosystem on the SE coast of Brazil. The study area included waters from 10 to 100 m deep and covered 3800 km(2). The trophic compartments of the system were established on ecologically or taxonomically related species, considering their relative abundance and similarity of diets and habits. The compartments are phytoplankton, zooplankton, salps, bacterioplankton, cnidaria, polyplacophora, mollusca, carnivorous benthos, detritivorous polychaetes, other detritivorous benthos, penaeidea-caridea, brachyura, and echinodermata. Biomass, production, and consumption were estimated in summer and winter. Plankton... |
| Tipo: Text |
Palavras-chave: Biomasse; Production; Consommation; Subtropical; Atlantique Ouest; Biomass; Production; Consumption; Subtropical; Western Atlantic. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00321/43241/42970.pdf |
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| Heral, Maurice; Bacher, Cedric; Deslous-paoli, Jean-marc. |
| Maurice Héral has been studying, since 1976 at the IFREMER Station of La Tremblade (France), the trophic networks of shellfish-farming ecosystems and, especially, the variability of available food, energy assessment, the ecophysiology of the Japanese oyster; he has set up a comprehensive model of shellfish farming production. He has been managing the Shellfish Farming Ecosystems Laboratory (LEC) since 1980. A specialist of digital models, Cédric Bacher has been working at the LEC since 1985. He invented a strategy of sampling farmed molluscs' biomass and a preliminary, analytic trophic model that combines physical and biological systems. Jean-Marc Deslous-Paoli has been a member of the same laboratory since 1979, where his work focuses on monitoring... |
| Tipo: Text |
Palavras-chave: Modèle analytique; Modélisation; Modéle global; Production; Capacité trophique; Biomasse; Climatologie; Captage naissain; Bassin Marennes Oléron. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/publication-3011.pdf |
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| Baleux, B.; Caumette, P.; Trousselier, M.. |
| Numeration, biomass, distribution within time, some physiological characters and a taxonomical outline, with a standardized micro method, of aerobic hétérotrophie bacteria isolated from sediments an waters, from fishponds of "Domaine de Certes" (Arcachon) from june 1977 to may 1978 are described. Number of hétérotrophie bacteria evolved in a significant way, according to seasons, and bacterial biomass is higher in the sediments than in the waters. Metabolic or physiological differences (proteolysis, denitrification) appeared among populations due to the origin of sediments. Moreover the qualitative study pointed out taxonomical units as Bacillus associated to seasons, or Agrobacterium associated to vegetable detritical sediments. |
| Tipo: Text |
Palavras-chave: Lagunes; Bactéries hétérotrophes aerobies; Biomasse; Taxonomie; Micro méthode; Enzymatiques; Lagoons; Aerobic heterotrophic bacteria; Biomass; Taxonomy; Enzymatic micro methods. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00306/41677/40886.pdf |
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| Caryo, Chrystelle. |
| L'estimation des stocks d'huîtres en élevage dans le bassin de Marennes-Oléron réalisée en 1988 est la cinquième opération annuelle consécutive de ce type. A cette occasion, une comparaison a été réalisée entre deux méthodes de traitement des données de surface ou de longueur d'installation à partir des couvertures photographiques aériennes au 1/10 000ème (surfaces en exploitation) et au 1/1 000ème (taux d'occupation des surfaces en exploitation). Les principaux résultats obtenus lors de cette étude montrent que par rapport à l'année précédente, on constate une relative stabilité des surfaces exploitées. Celles-ci sont en légère régression pour l'élevage à plat, et pratiquement inchangées pour l'élevage en surélévation. Par contre, les densités d'élevage... |
| Tipo: Text |
Palavras-chave: Ostréiculture; Huître japonaise; Crassostrea gigas; Bassin de Marennes-Oléron; Stocks; Surfaces exploitées; Densités; Biomasse; Méthodologie. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00105/21654/19235.pdf |
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| Mazurie, Joseph; Bouget, Jean-francois. |
| in order to estimate the carrying capacity of Mont Saint-Michel Bay, the stock (or biomass) of cupped oysters, Crassostrea gigas, cultivated intertidally, in Cancale Bay, has been estimated in october 2002. Aerial photographs, at 2 scales (1/10 000 and 1/2000), provided by the mollusc farmers union, have been used to estimate the cumulative length of surelevaged trestles (« tables ») and the occupation rate by oyster bags. A field survey, between the 7th and 9th of october 2002, has been conducted by Ifremer with the help of « Lycée Maritime de Saint-Malo », on 40 sampled stations : 3 subsample bags per station were examined (counts and weights of different age-class oysters). 309 ha out of 333 leased ha were considered exploited (after elimination of... |
| Tipo: Text |
Palavras-chave: Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Cupped oysters; Production; Biomass; Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Huîtres creuses; Production; Biomasse; Stock. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/rapport-5296.pdf |
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| Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean. |
| The evolution of the production of cupped oysters is estimated on a century (1885-1985) with three different sources of data. The total biomass in culture is calculated from productions by knowing regularly the growing rate and the mortality rate of the populations of oysters. It appears that the efficiencies of the culture (P/B) decrease when the stock increase. The production reaches a plateau maximum of 40 000 tons whereas the stock goes on to growth up to 200 000 tons. This plateau correspond to the maximal capacity of production of the ecosystem limited by the trophic capacities of the bay. This work shows that without management of the cultivated oysters, the stocks tend to exceed the minimal biomass which is necessary to reach the maximal potential... |
| Tipo: Text |
Palavras-chave: Biomasse; Marennes Oléron; Huîtres; Crassostrea angulata; Crassostrea gigas. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/acte-2965.pdf |
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| Cabecadas, L. |
| Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance ((P-I)-I-B) relation was studied based on the light-saturated photosynthesis rate (P(B)m) and the light-limited initial slope (a(B)). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of a(B) [0.10-0.20 mg C (mg Chl a)(-1) h(-1) (W m(-2))(-1)]; however, light seems to limit phytoplankton production in the water... |
| Tipo: Text |
Palavras-chave: Production primaire; Phytoplancton; Estuaire; Biomasse; Turbidité; Primary production; Phytoplankton; Estuary; Biomass; Turbidity. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43621/43310.pdf |
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| Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc; De Pontual, Helene; Raillard, Olivier; Maestrini, Serge; Mornet, Francoise; Menesguen, Alain; Sautour, Benoit; Robert, Jean-michel. |
| Les termes du contrat passé entre le Fond de la Recherche et de la Technologie et l'IFREMER précisent qu ele programmer a pour objectif une gestion rationnelle du milieu conchylicole avec notamment une mise au point de modèles (voir notification de l'aide en annexe). Un premier modèle appelé modèle global par analogie avec les modèles de pêche met en évidence la limite de la capacité trophique du bassin de Marennes-Oléron pour les huîtres cultivées. Un modèle analytique avec un modèle physique simple permet dans un premier temps de développer un modèle de croissance des huîtres en fonction de la nourriture disponible et d'effectuer des simulations qui confirment l'influence du stock sur les performances de croissance des bivalves. Un troisième approche... |
| Tipo: Text |
Palavras-chave: Modèle production; Biomasse; Huître creuse; Crassostrea gigas; Modèle énergétique; Croissance; Modèle multiboîte; Marennes Oléron; Modèle trophique; Marennes Oléron. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00048/15908/13337.pdf |
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| Caill-milly, Nathalie; Duclercq, Benoit; Morandeau, Gilles. |
| Between 1980 and 1986, some Arcachon oyster farmers took up breeding the Japanese clam on the foreshore (Robert et Deltreil, 1990). This production was short lived. The steep fall in prices due to economic competition from Spain, Portugal, Italy and Tunisia, predator action such as the trigger fish (Popovsky et al., 1999), added to the significant amount of mortality that occurred in the summer and autumn of 1992 that affected two-thirds of the total stock, led to clam farming being abandoned at the end of the 1980s. In the Arcachon basin, the Japanese clam (Ruditapes philippinarum) population, now natural to the area, has found favourable conditions for development and is expanding rapidly there. This species has been supplanting the local species... |
| Tipo: Text |
Palavras-chave: Ruditapes philippinarum; Veneridae; Popluation structure; Biomass; Stock assessment; Arcachon Bassin; Veneridae; Ruditapes Philippinarum; Bivalvia; Mollusca; Structure Population; Biomasse; Abondance; Evaluation Stock. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/2006/rapport-2218.pdf |
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| Martin, Jean-louis; Haure, Joel; Dupuy, Beatrice; Nourry, Max; Palvadeau, Hubert; Papin, Mathias; Penisson, Christian; Thouard, Emmanuel. |
| La baie de Bourgneuf est un bassin de 34000 ha dont l'activité ostréicole représente à elleseule plus de 95% du chiffre d'affaire local réalisé par la production conchylicole. Lesdifférentes études qui ont été réalisées ont montré que le stock d'huîtres en élevage (40000t) et la production annuelle (13000 t) qui en est issue variaient peu au cours des années (Barillé-Boyer et al., 1997, Haure et al. , 2003). Toutefois, les performances de croissance, ainsi que la qualité des huîtres produites sont médiocres et place ce bassin au dernier rang des sites français de production (données du réseau REMORA). Plusieurs études ont été entreprises, pour expliquer ce phénomène, par l'approche de la capacité trophique de cet écosystème et l'estimation des biomasses... |
| Tipo: Text |
Palavras-chave: Conchyliculture; Biomasse; Stocks; Huîtres creuses; Crassostrea gigas; Baie de Bourgneuf. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00048/15877/13299.pdf |
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| Registros recuperados: 56 | |
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