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Registros recuperados: 11
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Caractérisation sur estran et en laboratoire des 3 séries produites en troisième génération : G3SD - G3C1 - G3C2 ArchiMer
Degremont, Lionel; Fortin, Adeline; Boudry, Pierre.
Dans le cadre du programme MOREST, une première génération d'huître creuse Crassostrea gigas (G1) a été réalisée en 2001 à partir d'un plan de croisement hiérarchisé par les mâles. La caractérisation sur estran de 44 familles de plein-frères réparties en 17 familles de demi-frères a permis d'estimer l'héritabilité de la survie des naissains en période estivale. La valeur obtenue (h2 = 0,81 ± 0,29) indique que la majorité de la variance phénotypique est d'origine génétique. A partir de familles G1 sélectionnées pour les performances de survies, une sélection divergente visant à améliorer ou diminuer la survie du naissain en période estivale a été réalisée en 2002 et constitue la seconde génération (G2). La sélection divergente comprend deux séries de...
Tipo: Text Palavras-chave: Huître creuse; Crassostrea gigas; Génétique; Sélection; Estran.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00035/14668/11970.pdf
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Contrôle des performances biologiques de populations diploïdes et triploïdes d'huîtres creuses Crassostrea gigas ArchiMer
Benhaim, David.
Un programme concerannt le contrôle des perforùances biologiques de lots diploïdes et triploïdes d'huîtres creuses Crassostrea gigas a débuté en mars 1993 à La Tremblade et dans d'autres station IFREMER associées. Le présent rapport rend compte des cinq premiers mois d'analyses faisant partie d'un contrôle qui devrait se poursuivre jusqu'en 1994. A La Tremblade, l'expéreince repose principalement sur la comparaison des paramètres biométriques et biochimiques des lots diploïdes et triploïdes en deux sites d'étude : un parc ostréicole sur le bassin de Marennes-Oléron et une claire. Les individus diploïdes réfractaires du lot triploïde, sont identifiés par imagerie numérique et écartés des analyses. Les résultats obtenus montrent une difféence marquée entre...
Tipo: Text Palavras-chave: Crassostrea gigas; Triploïdes; Diploïde; Estran; Croissance; Biochimie.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00411/52220/52948.pdf
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Diversification de la production conchylicole : cultures de palourdes sur estran (Compte rendu n°4) ArchiMer
Goulletquer, Philippe.
Winter mortalities of the manila clam rl1d1 tapes philippinarum along the french atlantic coasts : biochemical and ecophysio-logical aspects. For some years, high mortalities on Manila clam's breeding occured at the end of Winter on Atlantic coasts. The ecophysioIogicaI survey of population was performed using a ground culture technique. This permitted to characterize the conditions related with mortalities such as a loss in dry weight and a decrease of metabol ic reserves. A comparison of biochemical composition was conducted during the occurence of mortality on different sites along the Atlantic coast, and in different ecosystems (tidal land, oysters ponds).
Tipo: Text Palavras-chave: Tidal bottom; Oyster pond; Glycogen; Ruditaoes phiIippinarum; Mortality; Estran; Claire ostréicole; Glycogène; Ruditaoes phiIippinarum; Mortalité.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/rapport-1566.pdf
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Diversification de la production : culture de palourdes sur estran, premiers résultats 1984 semis expérimentaux 1985 ArchiMer
Goulletquer, Philippe.
The study of foreshore clam culture with three immersion levels (40, 50, 70) has demonstrated a backlog in clam growth on the highest level, as well as a reproduction backlog and a weakened physical state during winter for populations unimmersed with a tide coefficient of 40-50. But the available areas for these cultures (areas that have not been allocated to oyster or mussel culture) are those unimmersed with those tide coefficients. Thus, it is not advised to extend the surfaces granted in the Marennes-Oléron basin, but on the contrary to use those granted to oyster culture but which are not exploited. This solution was the one accepted for the 1985 experimental seedings conducted over a 3 000 m² area on the Isles of Ré and Oléron and in Marennes, on...
Tipo: Text Palavras-chave: Marennes Oléron; Mortalité; Biomasse; Croissance pondérale; Croissance linéaire; Estran; Elevage; Palourdes.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-3839.PDF
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Etude Sédimentaire Appliquée à l'Aquaculture pour Cinq Estrans de Bretagne Sud (Morbihan et Loire Atlantique). ArchiMer
Lemoine, Gérard.
Within the national molluscan monitoring network, a sedimentary study was carried out on five experimental sites located in southern Brittany (i.e., from Etel to Pen-Bé rivers). The study aimed to specify sediment integrating characteristics with regards to hydrobiological variables. Moreover, interactions between sediment and water column characteristics were specified. It appears that this approach is likely unappropriate to characterize interdical rearing area productivity. However, this approach can support the site evaluation on a long term basis to sustain shellfish culture management. This would require additional study to assess sediment reactivity to abnormal events like drastic salinity decrease.
Tipo: Text Palavras-chave: Sédiment; Ostréiculture; Estran; Phosphore; Eutrophisation; Sediment; Oyster culture; Intertidal area; Phosphorus; Eutrophication.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00102/21344/18967.pdf
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Golfe Normano-Breton - Carte biomorphosédimentaire de la zone intertidale au 1/25 000 ArchiMer
Guillaumont, Brigitte; Hamon, Dominique; Piriou, Jean-yves; Lafond, L.r.; Le Rhun, J.; Levasseur, J..
Ce document, réalisé sous l'égide de l'IFREMER avec la collaboration du Laboratoire de Géomorphologie de l'Ecole Pratique des Hautes Etudes de Dinard et le Laboratoire Botanique de l'Université de Rennes 1, constitue la synthèse des travaux réalisés par le groupe "Estrans et Zones humides" dans le cadre de l'Etude Régionale Intégrée du Golfe Normano-Breton. Il se présente sous la forme d'une cartographie biomorphosédimentaire (7 cartes au 1/25 000) de la zone intertidale de la Côte Ouest du Cotentin et de la Baie du Mont Saint-Michel, complétée par une notice explicitant la légende des cartes et présentant les principaux ensembles biosédimentaires observés sur le littoral du golfe.
Tipo: Text Palavras-chave: Cartographie; Estran; Zones humides; Géologie; Morphologie; Sédimentologie; Zoobenthos; Phytobenthos; Végétation phanérogamique; Golfe Normano-Breton; Ouest Cotentin; Baie du Mont Saint-Michel.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00047/15851/13270.pdf
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Mortalité hivernale chez la palourde japonaise Ruditapes philippinarum sur le littoral atlantique : aspects biochimique et écophysiologique ArchiMer
Goulletquer, Philippe.
For some years, high mortalities on Manila clam's bredding occured at the end of winter on Atlantic coasts. The ecophysiological survey of population was performed using a ground culture technique. This permitted to characterize the conditions related with mortalities such as a loss in dry weight and a decrease of metabolic reserves. A comparison of biochemical composition was conducted during the occurence of mortality on different sites along the Atlantic coast, and in different ecosystems (tidal land, oysters ponds).
Tipo: Text Palavras-chave: Tidal bottom; Oyster pond; Glycogen; Ruditapes philippinarum; Mortality; Estran; Claires ostréicoles; Glycogène; Ruditapes philippinarum; Mortalité.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/publication-3019.pdf
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Mortalité hivernale chez la palourde japonaise Ruditapes philippinarum sur le littoral atlantique : aspects biochimique et écophysiologique ArchiMer
Goulletquer, Philippe.
For some years, high mortalities on Manlia clam's breeding occured at the end of winter on Atlantic coasts. The ecophysiological survey of population was performed using a ground culture technique. This permitted to characterize the conditions related with mortalities such as a loss in dry weight and a decrease of metabolic reserves. A comparison of biochemical composition was conducted during the occurence of mortality on different sites along the Atlantic coast, and in different ecosystems (tidal land, oysters ponds).
Tipo: Text Palavras-chave: Mortalité; Ruditapes philippinarum; Glycogène; Claires ostréicoles; Estran; Mortality; Ruditapes philippinarum; Gycogen; Oyster pond; Tidal bottom.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00134/24517/22546.pdf
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On the effect of tidal flats on the hydrodynamics of the Tagus estuary ArchiMer
Fortunato, Ab; Oliveira, A; Baptista, Am.
The effects of tidal flats on the hydrodynamics of the Tagus estuary are analysed using an accurate high-resolution shallow water model, supported by field data. Tidal flats act mainly as energy filters, rather than sinks, transferring energy from astronomic to non-linear frequencies. They also play a major role in determining the strong resonance mode that amplifies semi-diurnal constituents. We show that the upper estuary, with extensive tidal flats, has an increasing accretion rate. This "filling-up" results from a positive feedback between sediment deposition and the hydrodynamics: accretion in the upper estuary lengthens the duration of ebbs, decreasing sediment flushing and further increasing accretion.
Tipo: Text Palavras-chave: Estran; Propagation de marée; Modèle numérique; Estuaire du Tage; Tidal flats; Tidal propagation; Numerical model; Tagus estuary.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43626/43257.pdf
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Prévention des mortalités estivales de naissain d'huîtres creuses. Expérimentations sur estran (Rivière d'Auray, été 1998). 1 : comparaison de différents lots de naissain. 2 : tentative "d'endurcissement» du naissain". ArchiMer
Mazurie, Joseph; Kuntz, Gregoire; Claude, Serge; Hirata, Toshio.
Cupped oysters, Crassostrea gigas, often suffer abnormal mortalities during summer, at one year of age. Both scientists and professionnals are interested in finding practical methods to reduce these mortalities. The present study tries to answer two questions : 1- are there any differences of summer mortalities among various batches of spat available from spat collection areas (Arcachon and Charentes) ? 2- is it possible to improve summer survivals by wintering the spat at high air exposure locations (« hardening » procedure) ? The first comparison did not reveal any significant difference between the 16 batches of spat tested (mortalities between 5 % and 30 %). The second comparison in the same summer conditions was not able to show to any improvement...
Tipo: Text Palavras-chave: Huître creuse; Mortalité; Estran; Vitalité; Endurcissement; Gigas oyster; Mortality; Intertidal zone; Vitality; Hardening.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00105/21665/19243.pdf
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Signatures spectrales des objets du littoral ArchiMer
Viollier, Michel; Belsher, Thomas; Loubersac, Lionel.
Spectral signatures were measured on the coast using a "high-resolution" spectroradiometer and a SPOT simulation radiometer. These data allow to define optical indexes that are useful for the characterization of seaweeds and of intertidal areas.
Tipo: Text Palavras-chave: Radiometrie de terrain; Littoral; Algues; Estran; Teledetection; Spot.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/00143/25436/23589.pdf
Registros recuperados: 11
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