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Registros recuperados: 74
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Infection dynamics of Marteilia refringens in flat oyster Ostrea edulis and copepod Paracartia grani in a claire pond of Marennes-Oleron Bay ArchiMer
Audemard, Corinne; Sajus, Marie-céline; Barnaud, Antoine; Sautour, Benoît; Sauriau, Pierre-guy; Berthe, Franck.
The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M refringens in French shallow-water oyster ponds ('claires'). This study reconsidered M refringens transmission dynamics in the light of this finding, taking into account not only oyster infection dynamics and environmental factors but also data concerning the copepod host. P. grani population dynamics in the claire under study revealed that this species is the dominant planktonic copepod in this confined ecosystem. During winter, M refringens overwintered in O. edulis, with P. grani...
Tipo: Text Palavras-chave: Claire pond; Infection dynamics; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-2858.pdf
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Spatio-temporal differentiation in the population structure of Hydrobia ulvae on an intertidal mudflat (Marennes-Oleron Bay, France) ArchiMer
Haubois, Anne-gaelle; Guarini, Jean-marc; Richard, Pierre; Blanchard, Gerard; Sauriau, Pierre-guy.
Spatio-temporal changes in density, breeding cycle, growth and population structure of Hydrobia ulvae (Gastropoda: Prosobranchia) were studied by monthly sampling of a wide bare mudflat in Marennes-Oleron Bay. Four stations, located along a cross-shore transect and characterized by different geomorphological structures, were investigated from March 2000 to February 2001. Hydrobia ulvae was mainly distributed in the upper half part of the mudflat and no individuals were found in the lower part. The breeding cycle extended from March to December and showed two annual peaks, in spring and in autumn. Three cohorts were recruited during the year and showed high growth rates during summer; the parameters of the von Bertalanffy model describing the growth curves...
Tipo: Text Palavras-chave: Gastropoda; Mudflat; Spatio temporal change; Population dynamic.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-598.pdf
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Réseau trophique du bassin de Marennes-Oléron (rapport 1996). Région Poitou-Charentes ArchiMer
Bacher, Cedric; Blanchard, Gerard; Bougrier, Serge; Cariou-le Gall, Valerie; Delmas, D.; Deslous Paoli, Jean-marc; Dinet, A.; Garet, Marie-josee; Geairon, Philippe; Jonquieres, Gerard; Laisne, A.; Maffei, E.; Montagna, P. A.; De Montaudouin, Xavier; Morin, S.; Richard, P.; Riera, Pascal; Sauriau, Pierre-guy; Vrignaud, N..
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
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Anthrophisation in introduction d'espèces exogènes: mise en place de l'analyse génétique d'une population invasive de bigorneaux perceurs Ocinebrellus inornatus (Recluz, 1851) dans le bassin de Marennes-Oléron ArchiMer
Garcia-meunier, Pascale; Saab, Lucie; Pigeot, Jacques; Chevalier, Guillemette; Goulletquer, Philippe; Sauriau, Pierre-guy.
bien qu'elles aient existé depuis plusieurs siècles, les invasions biologiques en milieu marin se sont considérablement accélérées durant les dernières décennies, suite à l'accroissement du trafic maritime à travers les océans et aux transferts intercontinentaux d'espèces à des fins d'aquaculture. Ainsi, la découverte dans le bassin de Marennes-Oléron d'une nouvelle espèce de bigorneau perceur Ocinebrellus inornatus (Récluz,1851), originaire du Pacifique asiatique, laisse présager un accroissement des risques de mortalité pour les cheptels cultivés (huître, moule) et pour les ressources de la pêche littorale. Notre premier objectif est avant d'en étudier la dynamique de population d'en définir les caractéristiques génétiques en comparaison de celles de...
Tipo: Text Palavras-chave: Ocinebrellus inornatus; Invasions biologiques; Pression anthropique; Marqueurs moléculaires; Pertuis Charentais.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00065/17582/15105.pdf
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Echantillonnage des populations naturelles de mollusques compétiteurs trophiques des huîtres cultivées Crassostrea gigas du bassin de Marennes-Oléron : aspects méthodologiques ArchiMer
Sauriau, Pierre-guy.
The main problems involved in making biomass and density estimates of benthic mol1uscs are the choice of a sampling plan, the level of systematic errors and random errors. A stratified random sampling after optimum allocation was used in the case. The benthic molluscs estimates (biomass or density) are highly variable, due to their aggregated distribution. The sampling gear used is a Smith Mc-lntyre grab which introduce a bias in the estimates. Nevertheless, the Macoma baLthica community was predominant in the bay but Cerastoderma edul.e appeared to be the dominant specie.
Tipo: Text Palavras-chave: Cerastoderma edule; Macoma balthica; Marennes Oleron Bay; Crassostrea gigas; Stock assessment; Cerastoderma edule; Macoma balthica; Marennes Oléron; Crassostrea gigas; Echantillonnage.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-2971.pdf
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Gestion des bassins conchylicoles ArchiMer
Heral, Maurice; Prou, Jean; Sauriau, Pierre-guy; Goulletquer, Philippe.
The excess of farmed mollusc biomass in some French shellfish-farming basins (Marennes-Oléron basin, Isle of Ré, Isle of Bourgneuf) has been clearly highlighted. This manifests itself as a decrease of growth consistency of the molluscs and an increase in chronic mortality rates not linked to pathogenic agents. To this excess of farmed biomass are added the biomass of oysters or "wild" mussels or biomass linked to abandoned concessions.
Tipo: Text Palavras-chave: Estimation; Croissance; Biomasse; Conchylicultre.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/acte-3084.pdf
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Evaluation du stock de palourdes du bassin d'Arcachon ArchiMer
Bertignac, Michel; Auby, Isabelle; Sauriau, Pierre-guy; De Montaudouin, Xavier; Foucard, Julie; Martin, Sophie.
As part of a larger project financed by the European Union programme "Community initiative PESCA" on the study of "small scale fisheries" in Aquitaine (France), an estimation of the stock of clams in the Bassin d'Arcachon has been conducted. A two-stage stratified random sampling survey has been designed. Samples have been collected using a Hamon bottom sampler in 237 locations distributed over 24 km2. The clam Tapes philippinarum, which appeared in the basin following a series of aquaculture experiments in the mid eighties, is now the main species accounting for more than 90% of the abundance and the biomass, largely overcoming the European species Tapes decussata. The mean abundance and biomass (26 clams / m2 et l28g / m2) are above those estimated in...
Tipo: Text Palavras-chave: Palourde; Tapes philippinarum; Tapes decussata; Evaluation stock; Pêche; Pêche à pied; Echantillonnage; Bassin d'Arcachon; Clam; Tapes philippinarum; Tapes decussata; Stock assessment; Fishery; Sampling; Bassin d'Arcachon.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00105/21658/19240.pdf
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Effects of short-term environmental disturbances on living benthic foraminifera during the Pacific oyster summer mortality in the Marennes-Oléron Bay (France) ArchiMer
Bouchet, Vincent; Debenay, Vincent; Sauriau, Pierre-guy; Radford Knoery, Joel; Soletchnik, Patrick.
Sediment cores were collected from April to August 2004 on tidal mudflats of the macrotidal Marennes-Oléron Bay (SW France), famous for the cultivation of Pacific oysters (Crassostrea gigas). The response of living (stained) benthic foraminifera to short-term biogeochemical disturbances in the sediment and overlying water, which may be involved in oyster summer mortality, was monitored. Short-term hypoxia occurred in early June, in conjunction with a sudden rise in temperature. In mid-June, the ammonia content of sediment porewater increased, leading to potentially maximal flux towards overlying waters. Foraminiferal assemblages, particularly in the topmost layer, were altered. Ammonia tepida was the most tolerant to temperature increase and hypoxic...
Tipo: Text Palavras-chave: Marennes Oléron bay; Aquaculture; Crassostrea gigas; Intertidal; Ammonium; Hypoxia; Organic matter; Living benthic foraminifera.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2586.pdf
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Zostères de Manche-Atlantique : de la DCE aux questions de recherche ArchiMer
Oger-jeanneret, Helene; Trut, Gilles; Ganthy, Florian; Sauriau, Pierre-guy; Budzinski, Hélène; Gonzalez, Patrice; Gamain, Perrine; Maury-brachet, Régine; Feurtet-mazel, Agnès; Auby, Isabelle; Dalloyau, Sébastien; Rollet, Claire; De Casamajor, Marie-noelle; Sanchez, Florence; Rigouin, Loic; Fortune, Mireille; Lejolivet, Aurore; Thevand, Adeline; Grall, Jacques; Hily, Christian; Lamouroux, Mélina; Fera, Philippe.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00310/42085/41387.pdf
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Contrôle de surveillance 2017 DCE de la masse d’eau côtière «FRGC53 - Pertuis Breton» et de la masse d’eau de transition «FRGT30 - Estuaire du Lay» pour les herbiers de Zostera (Zosterella) noltei Hornemann : rapport final ArchiMer
Aubert, F.; Sauriau, Pierre-guy; Pineau, P..
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00438/54974/56378.pdf
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La Crépidule : identifier les mécanismes de sa prolifération et caractériser ses effets sur le milieu pour envisager sa gestion (Chantier : Baie de Marennes-Oléron) ArchiMer
Sauriau, Pierre-guy; De Montaudouin, Xavier; Gomez, Stéphane; Joassard, Lucette; Breret, Martine.
Les points forts des résultats acquis sur le chantier Marennes-Oléron au cours du programme LITEAU Crépidule sont énumérés : 1- Introduite dans le bassin de Marennes-Oléron à la fin des années soixante, Crepidula fornicata y a depuis colonisé principalement les bordures de chenaux et fonds subtidaux répondant à ses exigences écologiques. Ce nouveau biotope représente moins de 13% des surfaces de la baie pour un stock vivant ne dépassant pas quelques milliers de tonnes frais. De plus, du fait des opérations de nettoyage organisées depuis 1980 en baie de Marennes-Oléron, une relative stabilité du stock de crépidule est à noter dans cette baie depuis 25 ans. Ce n’est en revanche pas le cas du site de Fouras, où les opérations de nettoyage ne sont pas...
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00032/14293/11572.pdf
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La Crépidule : identifier les mécanismes de sa prolifération et caractériser ses effets sur le milieu pour envisager sa gestion (Chantier : Bassin d'Arcachon) ArchiMer
De Montaudouin, Xavier; Sauriau, Pierre-guy; Nauleau, Peggy; Labarraque, Dorothée; Giraud, Karen; Tiozzo, Julien.
Le stock de crépidules dans le Bassin d’Arcachon est estimé à 155 t (poids frais). La faible expansion de cette espèce dans la lagune est sans doute liée à la rareté de son substrat de prédilection (vases subtidales) et à l’interdiction des engins de pêche traînants, agents dispersifs. Même si les crépidules subissent une légère compétition intraspécifique au niveau du recrutement, la production des populations est proportionnelle à la biomasse, même pour des valeurs de 256 g poids sec m-2, soit 8 kg poids frais m-2. Aucun seuil d’autolimitation n’a donc été détecté. Les crépidules présentes en milieu sableux ont tendance à envaser le milieu. La signature isotopique des huîtres et des crépidules suggère certaines sources trophiques communes aux deux...
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00032/14289/11568.pdf
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Making water flow: a comparison of the hydrodynamic characteristics of 12 different benthic biological flumes ArchiMer
Jonsson, Per R.; Van Duren, Luca A.; Amielh, Muriel; Asmus, Ragnhild; Aspden, Rebecca J.; Daunys, Darius; Friedrichs, Michael; Friend, Patrick L.; Olivier, Frédéric; Pope, Nick; Precht, Elimar; Sauriau, Pierre-guy; Schaaff, Estelle.
Flume tanks are becoming increasingly important research tools in aquatic ecology, to link biological to hydrodynamical processes. There is no such thing as a "standard flume tank", and no flume tank is suitable for every type of research question. A series of experiments has been carried out to characterise and compare the hydrodynamic characteristics of 12 different flume tanks that are designed specifically for biological research. These facilities are part of the EU network BioFlow. The flumes could be divided into four basic design types: straight, racetrack, annular and field flumes. In each facility, two vertical velocity profiles were measured: one at 0.05 m s(-1) and one at 0.25 m s(-1). In those flumes equipped with Acoustic Doppler Velocimeters...
Tipo: Text Palavras-chave: Methods; Hydrodynamics; Flume tanks; Biological physical interaction; Benthic boundary layer.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2242.pdf
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Effect of seasonal variation in trophic conditions and the gametogenic cycle on d13C and d15N levels of diploid and triploid Pacific oysters Crassostrea gigas ArchiMer
Malet, Nathalie; Sauriau, Pierre-guy; Faury, Nicole; Soletchnik, Patrick; Guillou, Gael.
Carbon and nitrogen stable isotopes were investigated in separate organs of diploid and sterile triploid Pacific oysters Crassostrea gigas for 13 mo, together with changes in chemical and isotope composition of suspended matter sampled from an intertidal mudflat within Marennes-Oléron Bay, France. Particulate organic matter (POM) was a mixture of pelagic and benthic material with a predominance of neritic phytoplankton in spring, and resuspended microphytobenthos in summer and autumn. A remarkable shift of +30/00 in d13C was reflected in both diploids and triploids from spring to summer, and further temporal differences were observed amongst their tissues. Seasonal changes in POM d15N were also reflected in oyster tissues, with digestive gland and muscle...
Tipo: Text
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2828.pdf
Registros recuperados: 74
Primeira ... 1234 ... Última
 

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