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Les cartographies annuelles des biomasses microphytobenthiques ont été réalisées pour le bassin de Marennes-Oléron. Parallèlement les cartographies des caractéristiques sédimentaires ont été établies simultanément aux cartes d'abondance et biomasse macrofauniques en portant un effort particulier sur les densités des compétiteurs des huîtres notamment les Crépidules. Simultanément les études des mécanismes contrôlant le réseau trophique sur la vasière de Brouage ont été poursuivies notamment les relations entre les flux de sels nutritifs et le microphytobenthos. L'importance de ce dernier compartiment dans la nutrition de l'huître a été clairement mis en évidence par l'utilisation des traçeurs isotopiques naturels. Enfin, les caractéristiques de filtration... Tipo: Text Palavras-chave: Bassin de Marennes Oléron; Microphytobenthos; Physiologie; Crassostrea gigas; Crépidules; Modèle réseau trophique; Cartographie; Charente-Maritime. Ano: 1996 URL: http://archimer.ifremer.fr/doc/00102/21294/18911.pdf Feeding responses of Crassostrea gigas (Thunberg) to inclusion of different proportions of toxic dinoflagellates in their diet ArchiMer Bardouil, Michele; Bohec, Madeleine; Bougrier, Serge; Lassus, Patrick; Truquet, Philippe. An experimental flow-through system allowing determination of the feeding behaviour of individual molluscs was used to study oysters exposed to mixed diets composed of varying proportions of the diatom Thalassiosira weissflogii and two strains (toxic and nontoxic) of the dinoflagellate Alexandrium larnarense. Our results show that, when compared to a T. weissflogii unialgal diet, even a diatomltoxic dinoflagellate ratio as low in biomass as 90/10 reduced clearance rates and biodeposit production by oysters. Consumption was slightly but significantly decreased for a 50/50 diatomltoxic dinoflagellate mixture. For the toxic dinoflagellate unialgal diet, ingestion, absorption and consumption were completely inhibited. Thus, the inclusion of low amounts of... Tipo: Text Palavras-chave: Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiologie; Toxine paralysante des coquillages; Crassostrea gigas; Thalassiosira weissflogii; Alexandrium tamarense; Ecophysiology; Paralytic shellfish poison. Ano: 1996 URL: http://archimer.ifremer.fr/doc/00017/12788/9729.pdf Alimentation expérimentale de l'huître Crassostrea gigas à l'aide de navicules bleus Haslea ostrearia (Simonsen) de différentes tailles ArchiMer Barille, Laurent; Bougrier, Serge; Geairon, Philippe; Robert, Jean-michel. The influence on the feeding physiology (clearance, filtration, ingestion, absorption) of the Japanese oyster Crassostrea gigas of low concentrations of suspended particulate matter (SPM ranging from 2 to 20 mg.l-l) and high food quality (mean organic fraction =54 %) was studied in the laboratory. Experimental diets were made up with three strains of the "blue diatom" Haslea ostrearia, which is responsible of the greening of oyster-ponds. The strains were characterized by different sizes (48, 65 and 98 µm respectively) but possessed the same density and biochemical composition. Clearance rate was found constant at 2.2 1.h(-l).g-l dry weight and therefore was not influenced by increasing seston load. Pseudofaeces production was observed for SPM... Tipo: Text Palavras-chave: Taille des particules; Qualité alimentaire; Haslea ostrearia; Crassostrea gigas; Alimentation; Particle size; Food quality; Haslea ostrearia; Crassostrea gigas; Feeding. Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-3070.pdf Retention efficiency in oyster Crassostrea gigas exposed to variable food quantity and quality ArchiMer Barille, Laurent; Prou, Jean; Heral, Maurice; Bougrier, Serge. Relative retention efficiency (Er%) of Crassostrea gigas was estimated in the laboratory with 7 diets consisting of algae and silt. Total particulates varied from 1.34 mg/l in natural sea water to 27.65 mg/l in natural sea water enriched with silt. It was also calculated from field experiment to get high concentration of seston up to 66 mg/l. It appeared that Crassostrea gigas did not adjust its retention according to the food quality and the gill porosity was controlled by the concentration of particulate matter. In low seston load (1.34 mg/l) the oyster showed no change in retention for particles larger than 3-4 µm (Equivalent Spherical Diameter, ESD) but at the highest concentration (66 mg/l) it could only retain with a maximum efficiency particles... Tipo: Text Palavras-chave: Crassostrea gigas; Dietary quality; Particle concentration; Physiological model; Retention efficiency. Ano: 1992 URL: http://archimer.ifremer.fr/doc/00100/21096/18721.pdf Does the prevalence of Bonamia and Marteilia diseases be reduced on flat oysters (Ostrea edulis) of Atlantic and Mediterranean origin, when they are reared together with the Japanese oyster (Crassostrea gigas) in tidal ponds? ArchiMer Bodoy, Alain; Bougrier, Serge; Geairon, Philippe; Garnier, Jacqueline; Boulo, Viviane; Heurtebise, Serge. The flat oyster Ostrea edulis was originally reared in several regions of the European waters. The tidal saline ponds on the Atlantic coasts of France were highly productive before being hit by two consecutive epizooties. Parasitic diseases were described on this species, both of them leading 10 economic losses, as heavy mortalities have usually been recorded before the oysters reach the commercial size. Repeated experiments showed that the two diseases, Marteilia refringens and Bonamia ostreae are still active in this environment. Recently, some evidences were given that haemocytoblasts of Crassostrea gigas had the ability to lyze the Bonamia cells. Therefore, in an experiment of contiguous culture of the two species of oysters, the growth, mortality and... Tipo: Text Palavras-chave: Molluscs; Mortalities; Growth; Pathology; Crassostra gigas; Ostrea edulis; Marteilia refringens; Bonamia ostreae. Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-3049.pdf Amélioration de la qualité chez l'huître creuse Crassostrea gigas par sélection de souches performantes - Contrat de Plan Etat Région Poitou-Charentes 1994-1998 - Rapport année 1995 ArchiMer Boudry, Pierre; Naciri, Yamama; Heral, Maurice; Collet, Bertrand; Bougrier, Serge; Geffard, Olivier; Ledu, Christophe; Phelipot, Pascal; Heurtebise, Serge; Gerard, Andre. Le programme de recherche présenté ci-dessous est le fruit d'une réflexion conjointe entre généticiens et physiologistes afin de mettre sur pied un ensemble d'expériences permettant d'étudier les bases génétiques de la variabilité des caractères impliqués dans la croissance chez l'huître creuse, Crassostrea gigas. Tipo: Text Palavras-chave: Génétique; Sélection génétique; Génétique des populations; Croissance; Crassostrea gigas. Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15518/12905.pdf Contribution à l'étude de la variabilité phénotypique et génétique des crustacés isopodes (Idotea balthica Pallas et Metoponorthus pruinosus Brandt) et pénéides (Penaeus japonicus Bate) ArchiMer Bougrier, Serge. Les travaux, mentionnés dans ce mémoire, ont été effectués au laboratoire de Biologie Animale, "Physiologie et Génétique des Crustacés", de l'Université de Poitiers. Nous avons entrepris dans une première partie la comparaison morphologique de trois populations (une togolaise et deux françaises), dont nous mettons en doute l'appartenance de la même espèce Metoponorthus pruinosus. En effet des essais de croisements (JUCHAULT et KOUIGAN), communications personnelles) entre diverses populations africaines d'une part et françaises d'autre part ne fournissent aucune descendance, bien que dans certains il y ait accouplement. Le but de notre étude est donc de mettre en évidence les différences statistiquement significatives, qui peuvent exister entre les... Tipo: Text Ano: 1981 URL: http://archimer.ifremer.fr/doc/00451/56300/57888.pdf Activité respiratoire en continu de l'huître Crassostrea gigas : mise au point d'une nouvelle méthodologie ArchiMer Bougrier, Serge; Geairon, Philippe. A continuous monitoring system to measure the respiration of Crassostrea gigas has been developped. The metabolic function estimated by oxygen consumption has been monitored during periods of 24 h, without food, at a temperature constant of 15°C. Preliminary results showed that the mean percentage of oyster activities was 50 % with a high variability from 0 to 100 %. The number of activity periods per day (24 h) is function of the oysters with variation between 0 and 7. Tipo: Text Palavras-chave: Physiology; Respiration; Crassostrea gigas; Oysters; Physiologie; Respiration; Crassostrea gigas; Huîtres. Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-3046.pdf Le tri préingestif particulaire chez l'huître Crassostrea gigas et la moule Mytilus edulis ArchiMer Bougrier, Serge; Heral, Maurice; Hawkins, Andrew; Bayne, Barry. Using flow cytometry techniques, it is possible to study both the potential impact of filter-feeder bivalves on microalgal communities as well as the changes in the grazed microalgae and the behaviour of these bivalves whose diet is composed of a mixture of different species. Tipo: Text Palavras-chave: Physiologie; Mytilus edulis; Crassostrea gigas; Tri préingestif. Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3252.pdf Paralytic shellfish poison accumulation yields and feeding time activity in the Pacific oyster (Crassostrea gigas) and king scallop (Pecten maximus) ArchiMer Bougrier, Serge; Lassus, Patrick; Bardouil, Michele; Masselin, Pierre; Truquet, Philippe. Pacific oysters and king scallops placed individually in a recirculating flume were fed for 2 weeks with a constant concentration (120 cell ml(-1)) of a toxic strain of Alexandrium minutum. Fluorescence at the outlet of each experimental unit was measured continuously, and biodeposits were recovered twice daily to evaluate feeding time activity (FTA) and rates of organic filtration (OFR), ingestion (OIR) and organic absorption (OAR). Ion-pairing high performance liquid chromatography (IP-HPLC) was performed concurrently to quantify paralytic phycotoxins both (i) individually in shellfish at the end of the contamination period and (ii) in A. minutum cultures to estimate cellular toxin concentration. These data allowed comparison of the actual tissue toxin... Tipo: Text Palavras-chave: Alexandrium minutum; Crassostrea gigas; Feeding activity; Paralytic shellfish poisoning. Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-576.pdf Métabolisme de l'huître Crassostrea gigas stockée dans des dégorgeoirs conchylicoles, à différentes densités et saisons ArchiMer Bougrier, Serge; Masson, Daniel; Geairon, Philippe; Fouche, Dominique; Leroy, Anne; Faury, Nicole; Ratiskol, Jacqueline. One of the problems faced by oyster farmers in France is the immediate or delayed mortality of oysters in the storage tanks prior to shipping. This may be due to overstocking and/or improper water management. To investigate the problem, experiments were performed in commercial storage tanks stocked with oysters at different densities. The aim of this study was to provide some basic experimental data and guidelines for better handling of oysters prior to shipping Tipo: Text Palavras-chave: Physiology; Oyster farmers; Crassostrea gigas; Oysters; Storage tanks; Physiologie; Ostréiculture; Dégorgeoirs; Crassostrea gigas; Huîtres; Bassin stockage. Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-3047.pdf Essai de réimplantation de Crassostrea angulata en France. Résistance au chambrage et comportement des hybrides C. angulata - C. gigas ArchiMer Bougrier, Serge; Raguenes, Gerard; Bachere, Evelyne; Tige, Gilbert; Grizel, Henri. The inability to rear the oysters C. gigas and O. edulis in certain Brittany waters has prompted us to conduct breeding trials with C. angulata C. gigas and their hybrids. Results have revealed that all the strains tested were sensitive to Tributyl tin (TBT), showing atnormal shell thickness and their growth was lower than C. gigas. In addition, C. angulata was still affected by the presence of the Iridovirus in France. Tipo: Text Palavras-chave: TBT; Breeding trials; Hubrids; Crassostrea gigas; Crassostrea angulata; TBT; Chambrage; Croisement; Hybrides; Crassostrea gigas; Crassostrea angulata. Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-3102.pdf Programme général de recherche sur la nacre. Écophysiologie de l'huître perlière, approche des relations entre la croissance de l'huître Pinctada margaritifera et le milieu dans le lagon de Takapoto ArchiMer Buestel, Dominique; Pouvreau, Stephane; Tiapari, Jerome; Bougrier, Serge; Chabirand, Jean-michel; Geairon, Philippe; Fougerouse, A. A study of pearl oysters Pinctada margaritifera growth and mortality was done on a monthly basis between June 1990 and September 1991 in Takapoto atoll (Tuamotu archipelago). Meanwhile, sampling parameters representative of bivalves food showed a remarquable spatial stability whithin the lagoon. The amplitude of temporal variability varied in the order of some days. Carrying capacity appears low : energetic content of particulate material in waters is about 2 joules/liter, ten times lower than in temperate areas. On the opposite, seasonal effect is reduced and particulate food is always available. Oysters rearing conditions were appropriate during the studied period with a low mortality rate and a regular growth in size (from 97 mm to 136 mm). Pearls... Tipo: Text Palavras-chave: Atoll; Pearl oyster; Carrying capacity; Growth; Pinctada margaritifera; Atoll; Huître perlière; Capacité Trophique; Croissance; Pinctada margaritifera. Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-1642.pdf Etudes des bases génétiques et de la varibailité des caractères physiologiques impliqués dans la croissance chez l'huître creuse Crassostrea gigas ArchiMer Collet, Bertrand; Boudry, Pierre; Bougrier, Serge; Heurtebise, Serge; Phelipot, Pascal; Ledu, Christophe; Morand, Berenice; Heral, Maurice; Gerard, Andre. A European programme (GENEPHYS) was launched in 1996 to study the genetic basis and variability of physiological characters involved in growth in Crassostrea gigas. This research programme was a prerequisite for any genetic selection programme on physiological functions. Research groups from Ireland, England, Greece and France are involved in this project and participate in genetic analyses (allozymes and microsatellites) and physiological analyses (ecophysiology, enzymology, stress proteins). Ifremer at La Tremblade was responsible for producing the biological material while Ifremer-CREMA (human-influenced marine ecosystems research centre) was responsible for carrying out non-destructive physiological analyses. Tipo: Text Palavras-chave: Sélection génétique; Croissance; Crassostrea gias; Génétique. Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3243.pdf Compte-rendu et recommandations de l'atelier RINBIO tenu au Centre de Nantes les 19 et 20 janvier 1997 - De l'usage de la méthode des transplants de moule pour le suivi de la contamination chimique le long des côtes méditerranéennes françaises ArchiMer Cossa, Daniel; Abarnou, Alain; Andral, Bruno; Bougrier, Serge; Buestel, Dominique; Claisse, Didier; Hatt, Philippe-jacques; Stanisiere, Jean-yves. Ce rapport fait suite à la création par les directions DEL et DRV de l'IFREMER d'un groupe de travail, dit RlNBIO, chargé d'étudier les implications de l'usage des transplants de populations de moules pour évaluer la contamination chimiques des zones côtières méditerranéennes. L'objectif du Réseau Intégrateurs Biologiques (RlNBIO) est en effet d'obtenir une évaluation des niveaux de la contamination chimique à l'échelle du bassin méditerranéen français. La méthodologie s'appuie sur la mesure des concentrations en contaminants métalliques et organiques bioaccumulés dans les tissus de moules transplantées (Mytilus galloprovincialis) pendant plusieurs dans les zones à étudier. Or, la phase exploratoire a mis en évidence une interdépendance entre les niveaux... Tipo: Text Ano: 1998 URL: http://archimer.ifremer.fr/doc/00086/19715/17356.pdf Comparison of growth of mussel, Mytilus edulis, on longline, pole and bottom culture sites in the Pertuis Breton, France ArchiMer Garen, Pierre; Robert, Stephane; Bougrier, Serge. Growth of the mussel, Mytilus edulis, was compared for the first time under three culture regimes, longline located in open sea, pole and on-bottom both situated on an intertidal flat, in the Pertuis Breton, on the Atlantic coastline of France. Mussel sampling was performed on a monthly basis over 1 year while monitoring of hydrobiological parameters was conducted on a biweekly basis. Fluctuation of environmental parameters showed a similar pattern on both sea and shore locations with generally higher concentration levels for the intertidal area compared with the open sea, i.e. 4.07 and 3.17 mg 1(-1) for particulate organic matter, 3.16 and 2 mug 1(-1) for chlorophyll-a, 58.43 and 38.72 mg 1(-1) for inorganic-N, respectively. A clear seasonal growth... Tipo: Text Palavras-chave: Condition index; Emersion; Food resource; Water quality; Growth; Mytilus edulis. Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-581.pdf Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - Third Progress Report 1st January-31st December 1998 - Contract N°FAIR 95-421 Commission of the European Communities ArchiMer Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Buestel, Dominique; Samain, Jean-francois; Hawkins, A. J. S.; Wilins, N.; Zouros, Eleftherios; Bonhomme, Francois; Thiriot Quievreux, Catherine. The EU project "GENEPHYS", initiated by the IFREMER laboratory GAP-La Tremblade (Génétique Aquaculture et Pathologie) and CREMA-l'Houmeau (Centre de Recherche en Ecologie Marine et Aquaculture), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main bjectives are : 1. To express the maximum variability of growth, both at the larval stage and at the adult stage, in a oyster population originating from parents of various origins. 2. To check the persistence over the time, of growth performance and related physiological functions. 3. To explain... Tipo: Text Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Growth; Absorption efficiency; Oysters; Crassostrea gigas. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00050/16151/13634.pdf Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - First Progress Report 1st January-31st December 1996 - Contract n° FAIR 95-421 Commission of the European Communities ArchiMer Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Hawkins, A. J. S.; Thiriot Quievreux, Catherine; Wilkinns, N. P.; Zouros, Eleftherios; Bonhomme, Francois. The EEC project "Genephys 1996-2000", initiated by the IFREMER laboratory GAP (Génetique, Aquaculture et Pathologie, La Tremblade and CREMA (Centre de Recherche en Ecologie Marine et Aquaculture, l'Houmeau), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main objectives are: 1- To express the maximum variability of growth, both at the larval stage and at the adult stage, in an oyster population originating from parents of various origins. 2- To check the persistence over the time, of growth performance and related physiological functions. 3-... Tipo: Text Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Absorption efficiency; Growth; Oysters; Crassostrea gigas. Ano: 1996 URL: http://archimer.ifremer.fr/doc/00050/16149/13632.pdf Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - Second Progress Report 1st January-31st December 1997 - Contract n° FAIR 95-421 Commission of the European Communities ArchiMer Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Hawkins, A. J. S.; Thiriot Quievreux, Catherine; Wilkins, N. P.; Zouros, Eleftherios; Bonhomme, Francois; Buestel, Dominique; Samain, Jean-francois. The UE project "GENEPHYS", initiated by the IFREMER laboratory GAP-La Tremblade (Génétique Aquaculture et Pathologie) and CREMA-L'Houmeau (Centre de Recherche en Ecologie marine et Aquaculture), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main objectives are : 1. To express the maximum variability of growth, both at the larval stage and at the adult stage, in a oyster population originating from parents of various origins. 2. To check the persistence over the time, of growth performance and related physiological functions. 3. To explain... Tipo: Text Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Absorption efficiency; Growth; Oysters; Crassostrea gigas. Ano: 1997 URL: http://archimer.ifremer.fr/doc/00050/16150/13633.pdf Compte rendu de la réunion des 14 et 15 Avril 1993 - La Tremblade - Réseau Génétique Mollusques (REGEMO) ArchiMer Gerard, Andre; Naciri, Yamama; Coatanea, Denis; Martin, Anne-genevieve; Barret, Jean; Claude, Serge; Heurtebise, Serge; Devauchelle, Nicole; Joly, Jean-pierre; Goulletquer, Philippe; Baud, Jean-pierre; Nourry, Max; Bougrier, Serge; Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno; Le Deuff, Rose-marie; Peignon, Jean-marie. La discussion générale organisée à la fin de la deuxième journée a fait ressortir les points suivants: 1- Les participants se sont déclarés satisfaits de la tenue de la réunion, tant dans son déroulement, que dans les échanges d'informations auxquels elle a donné lieu. La quantité et la qualité des résultats présentés a permis de mettre en évidence la puissance d'analyse que représente le travail en réseau. 2-L'importance de la valorisation des résultats a été soulignée à plusieurs reprises. La diffusion de l'information devrait se faire dans un premier temps par la voie de rapport internes à la DRV, puis par la voie d'articles publiés dans des revues scientifiques. Sur le programme "C. gigas triploïdes", une première diffusion des résultats obtenus en... Tipo: Text Palavras-chave: Génétique; Sélection génétique; Huître plate; Ostrea edulis; Génétique population; Croissance. Ano: 1993 URL: http://archimer.ifremer.fr/doc/00049/15981/13423.pdf Registros recuperados: 32 Primeira ... 1 2 ... Última

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