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REMOULA 2001. Réseau de croissance moule des Pertuis Charentais. Mars 2001 - mars 2002 ArchiMer
Robert, Stephane; Guilpain, Patrice; Grizon, James; Garen, Pierre; Geairon, Philippe; Razet, Daniel; Faury, Nicole; Seugnet, Jean-luc; Soletchnik, Patrick; Le Moine, Olivier; Taillade, Sylvie.
La mise en place d'un réseau de suivi de croissance des moules dans les Pertuis Charentais s' inscrit dans la démarche de contractualisation de l'IFREMER (Laboratoire Conchylicole de Poitou-Charentes) avec la Section Régionale Conchylicole de Poitou-Charentes. Les intérêts de la profession pour ce réseau sont multiples : l'évolution du classement des zones d'élevage et les baisses de rendement commerciaux annoncées (bouchots) sur les littoraux charentais et vendéen ces dernières années doivent pouvoir être encadrées par des mesures de référence historique, et explicatives. De cette manière, les informations de ce réseau pourront servir d'outil d'aide à la décision pour la profession pour une gestion du milieu optimisée. Les informations obtenues par les...
Tipo: Text Palavras-chave: Réseau de surveillance; REMORA; Moules; Mytilus edulis; Croissance; Mortalité; Pertuis Charentais.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00251/36234/34795.pdf
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Reproduction de la moule Mytilus edulis et de l'huître Crassostrea gigas dans le bassin de Marennes-Oléron - Saison 2003 ArchiMer
Geay, Amelie; Arnaud, Christophe; Masson, Daniel.
The monitoring of the reproduction of Crassostrea gigas, and more occasionally that of the mussel Mytilus edulis, is carried out in Charente Maritime, each year, from June through to September. This report presents the main results obtained in 2003 and compares the years 2002 and 2003. It also recalls the techniques used and provides, in appendix, some bibliographic information on larval development.
Tipo: Text Palavras-chave: Marennes Oléron; Larves; Captage; Mytilus edulis; Moules; Crassostrea gigas; Huîtres; Reproduction.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-6575.pdf
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In vitro proteolysis of myofibrillar and sarcoplasmic proteins of white muscle of sea bass (Dicentrarchus labrax L.): effects of cathepsins B, D and L ArchiMer
Delbarre Ladrat, Christine; Verrez-bagnis, Veronique; Noel, Joelle; Fleurence, Joel.
The purpose of this study was to obtain additional information regarding proteolysis mechanisms and disorganization of fish myofibrils resulting in a loss of flesh quality. The ability of cathepsins to degrade in vitro myofibrillar and sarcoplasmic proteins from fish muscle was investigated in order to explain their role in post mortem softening. This led to the identification of substrates of the enzymes. Cathepsins degraded myosin heavy chain and a-actinin. Tropomyosin and actin were only susceptible to the action of cathepsin L. Troponin T (assumed 32 kDa component) was resistant only to the action of cathepsin D. Desmin was degraded by cathepsins B and L. Slight changes of some other myofibrillar or cytosolic proteins were also observed (creatine...
Tipo: Text Palavras-chave: Post mortem degradation; Fish muscle proteins; Cathepsins; In vitro proteolysis.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-1684.pdf
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IBGN study: Murgat ArchiMer
Roque D'Orbcastel, Emmanuelle; Ceruti, L; Blancheton, Jean-paul.
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00358/46948/46856.pdf
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Spatial variability in oxygen and nutrient fluxes at the sediment-water interface on the continental shelf in the Gulf of Lions (NW Mediterranean) ArchiMer
Denis, L; Grenz, C.
The spatial variability of oxygen and dissolved nutrient exchanges across the sediment-water interface was studied on the continental shelf in the Gulf of Lions (NW Mediterranean Sea). Replicate sediment cores were sampled at nine stations (64-162 m depth) along two lines parallel to the coast during two cruises in March and June 1998. Sediment-water exchanges were measured using the core incubation technique. Surficial sediments, bottom water and interstitial water characteristics were also described. Fluxes of oxygen (3.72-8.83 mmol m(-2) d(-1)), nitrate (0.026-0.283 mmol m(-2) d(-1)), ammonium (-0.022 to 0.204 mmol m(-2) d(-1)), nitrite (-0.034 to 0.002 mmol m(-2) d(-1)), phosphate (-0.007 to 0.029 mmol m(-2) d(-1)) and silicate (0.504-1.656 mmol m(-2)...
Tipo: Text Palavras-chave: Flux à l’interface eau-sédiment; Sels nutritifs; Minéralisation; Méditerranée nord-occidentale; Plateau continental; Sediment-water fluxes; Nutrients; Mineralization processes; NW Mediterranean; Continental shelf.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43263/42994.pdf
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Environmental status of the european seas ArchiMer
Frid, Chris; Hammer, Cornelius; Law, Robin; Loeng, Harald; Pawlak, Janet F.; Reid, Philip C.; Tasker, Mark; Carlberg, Stig; Jakobsen, Tore Jakobsen; Rice, Jake Rice; Skjoldal, Hein Rune; Andrulewicz, Eugene; Bodoy, Alain; Calabrese, Anthony; Carlberg, Stig; Caspersen, Ove; Daan, Niels; Dahlin, Hans; Ehrich, Siegfried; Gentien, Patrick; Keizer, Paul; Leppänen, Juha-markku; Lima, Carmen; Margonski, Piotr; Noji, Tom; Nunes, Teresa; Rugg, Dornford; Sköld, Mattias.
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00040/15135/12473.pdf
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Rapport d'activité 2002 du Laboratoire Génétique et Pathologie de La Tremblade ArchiMer
Goulletquer, Philippe.
Les principaux objectifs du laboratoire, visent essentiellement à développer des recherches chez les mollusques bivalves marins dans les domaines de : • la pathologie : surveillance des ressources conchylicoles, identification des agents pathogènes, description de leur cycle de développement, mise au point des techniques de reproduction expérimentale des maladies, développement d'outils performants de diagnostic utilisables à des fins de recherche ou de contrôle, étude de l'impact de ces maladies et de leur évolution géographique et temporelle. Et de • la génétique : étude des ressources génétiques, testage de nouvelles espèces, de nouvelles populations et d'hybrides pour limiter les risques liés à la monoculture. Obtention de souches résistantes ou...
Tipo: Text Palavras-chave: Rapport activité; Génétique; Pathologie; Mollusques; Bivalves.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00074/18554/16105.pdf
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Orbital and suborbital climate variability in the Sulu Sea, western tropical Pacific ArchiMer
Oppo, Dw; Linsley, Bk; Rosenthal, Y; Dannenmann, S; Beaufort, L.
A detailed record of planktic delta(18)O from a sediment core in the Sulu Sea, located between the South China Sea and the western Pacific warm pool, reveals that for the past 400 kyr (1 kyr = 1000 years), delta(18)O variability on orbital timescales is similar to that caused by changes in ice volume alone. This result indicates that in the Sulu Sea, temperature-driven changes in planktic delta(18)O on orbital times scales were generally compensated for by the effects of sea level and changes in seasonal monsoon intensity on the local freshwater budget, as well as by other changes in the tropical hydrologic cycle and their attendant effects on surface water delta(18)O. Increased freshening of the western tropical Pacific warm pool is reminiscent of La Nina...
Tipo: Text Palavras-chave: Sulu Sea; Tropical hydrography; East Asian monsoon; IMAGES; Suborbital climate variability; Sea level; Paleoceanography; Marginal and semienclosed seas; Climate dynamics.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00226/33680/32047.pdf
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Economic modelling as a tool to support macroalgal bloom management: a case study (Sacca di Goro, Po river delta) ArchiMer
Cellina, F; De Leo, Ga; Rizzoli, Ae; Viaroli, P; Bartoli, M.
During the last 20, years, intensive mollusk farming has been developed in coastal waters, mostly in sheltered bays and lagoons. Often, mollusk stocks are threatened by frequent anoxic events from macroalgal blooms. Here, a decision support tool is described to select the optimal short-term strategy to control algal biomasses. Even though long-term and detailed studies of the lagoon systems are required to provide reliable, biologically based policies, we have here developed a simplified analysis that overlooks most of the ecological complexity, but explicitly includes environmental variability and uncertainty in parameter estimation in the economic assessment of the performances of different management strategies. The aim is to quickly screen management...
Tipo: Text Palavras-chave: Gestion d'une floraison macroalgale; Analyse bio-économique; Modélisation stochastique; Ulva rigida; Tapes philippinarum; Algal bloom management; Bioeconomic analysis; Stochastic modelling; Ulva rigida; Tapes philippinarum.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43294/43030.pdf
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The Prinsen af Wales Bjerge formation lavas, East Greenland: The transition from tholeiitic to alkalic magmatism during Palaeogene continental break-up ArchiMer
Peate, Dw; Baker, Ja; Blichert-toft, J; Hilton, Dr; Storey, M; Kent, Ajr; Brooks, Ck; Hansen', H; Pedersen, Ak; Duncan, Ra.
We present elemental and isotopic (Sr-Nd-Pb-Hf-Os-He) data on primitive alkalic lavas from the Prinsen af Wales Bjeige, East Greenland. Stratigraphical, compositional and Ar-40-Ar-39 data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also postdated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high He-3/He-4 isotope ratios (R/R-A 12.4-18.5), sub-chondritic Os-187/(OSi)-O-88 (0.120-0.126), low epsilonNd(i) (similar to + 4) and epsilonHf(i) (similar to+ 6) that plot below the...
Tipo: Text Palavras-chave: Alkalic lavas; Flood basalts; High He-3/He-4; East Greenland; Recycled lithosphere; Iceland plume.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00224/33507/31953.pdf
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Diversité génétique chez les huîtres creuses du genre Crassostrea : quelles ressources pour quelle amélioration des productions de C; gigas? ArchiMer
Boudry, Pierre.
Despite the economic importance of oyster farming, knowledge about genetic resources of these species is still limited. The objectives of my research were to provide further information about (1) taxomomy, phylogeny and phylogeography of Crassostrea oysters, (2) to compare C. gigas and C. angulata strains of various geographic origins and (3) to study phenotypic and genetic variation for traits of aquacultural interest in C. gigas. Studies based on DNA polymorphism and chromosomes allowed to improve or correct identification, geographic range and phylogeographic relationships among several species. The comparison of various strains of C. gigas and C. angulata, both in laboratory and field conditions, revealed significant differences among taxa and the...
Tipo: Text Palavras-chave: Crassostrea gigas; Cupped oysters; Genetic improvement by selection; Variability; Strains testing; Phylogeny; Genetic resources; Crassostrea gigas; Huîtres creuses; Amélioration par la sélection; Variabilité; Testage de souches; Phylogénie; Ressources génétiques.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/these-3354.pdf
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Journées Conchylicoles IFREMER Centre de Nantes 12 et 13 mars 2003 ArchiMer
Prou, Jean; Conche, Nelly; Taillade, Sylvie.
Ce rapport synthétise les communications faites lors des "journées conchylicoles" sur les travaux scientifiques de l'Ifremer en soutien aux activités conchylicoles
Tipo: Text Palavras-chave: Génétique; Immunologie; Pathologie; Physiologie; Ecophysiologie; Système d'élevage.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00200/31115/29526.pdf
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Proteinaceous exotoxins of shrimp-pathogenic isolates of Vibrio penaeicida and Vibrio nigripulchritudo ArchiMer
Aguirre-guzman, Gabriel; Labreuche, Yannick; Ansquer, Dominique; Espiau, Benoit; Levy, Peva; Ascencio, Felipe; Saulnier, Denis.
The pathogenicity of two V. penaeicida strains, AM101 and KH-1, with different geographic origin, and V. nigripulchritudo strain AM102, were investigated in juvenile blue shrimp species Litopenaeus stylirostris. Alive bacteria and protein fractions (PFs) obtained from cell-free supernatants (CFS) were used in experimental challenges. Strains AM102, AM101, and KH-1 produced respectively 60, 54 and 12% mortality at 96h after infection using 104 cfu mL-1 of bacterial suspension. Exocellular toxin-like factors were evidenced in CFS from the New Caledonian strains (AM102 and AM101) but not the Japanese strain (KH-1). At 48h post injection of each CFS, mortality rates were respectively 96,98 and 5% when these strains were cultivated at 20°C, whereas only O,16...
Tipo: Text Palavras-chave: Pathogenicity; Exotoxin; Shrimp; Litopenaeus stylirostris; Vibrio nigripulchritudo; Vibrio penaeicida.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-2807.pdf
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Two new species of spionidae (Annelida : polychaeta) from Mid-Atlantic ridge hydrothermal vents ArchiMer
Sigvaldadottir, Elin; Desbruyeres, Daniel.
Two new species of polychaetous annelids Prionospio unilamellata sp. nov. and Laonice asaccata sp. nov. (Spionidae) are described from samples collected at Mid-Atlantic hydrothermal vent fields close to the Azores Triple Junction and in the Snake Pit vent field. These two species are important components of the communities associated with active venting. Prionospio unilamellata differs from all other Prionospio species in the form of anterior notopodial lamellae. Laonice asaccata differs from other Laonice species by lacking interparapodial pouches.
Tipo: Text Palavras-chave: Identification; Prionospio unilamellata; Spionidae; Deep sea; Hydrothermal vent.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-889.pdf
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Modèlisation des transferts de nutriments dans le continuum "Seine, Seine Aval, Baie de Seine" ArchiMer
Billen, Gilles; Cugier, Philippe; Garnier, Josette; Menesguen, Alain; Guillaud, Jean-francois; Durand, I.
Le processus d'eutrophisation des milieux marins côtiers, et le développement épisodiques de dinoflagellés qui en est une des manifestations, dépend de manière complexe de l'équilibre des flux d'azote, de phosphore et de silice en provenance des milieux terrestres du bassin versant. Ceux ci sont déterminés par la manière dont les activités humaines sur le bassin versant interagissent avec les processus naturels. La possibilité de prévoir l'effet sur l'eutrophisation marine des mesures prises pour l'amélioration de la qualité des eaux continentales dépend donc à la fois de notre connaissance du fonctionnement des milieux marins et de celui des bassins versants. En vue de développer les outils de modélisation nécessaire pour prévoir l'Etat de la Baie de...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00106/21695/19274.pdf
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Etude des mouvements calciques dans les hémocytes de l'huître creuse Crassostrea gigas lors de leur immunostimulation : 1ères approches expérimentales ArchiMer
Aton, Emilie; Cognard, C.; Renault, Tristan; Thomas-guyon, Hélène; Imbert, N..
Bivalve mollusc farms are continuously exposed to variations of factors either natural (variation of salinity and temperature) or from man (heavy metals, HAP, phytosanitary) likely to alter the defence systems of bivalve molluscs. These alterations would explain, in certain cases, their sensitivity vis-à-vis certain marine pathogens and could in part be at the source of the episodes of massive mortalities seen periodically in oyster and mussel larval populations. That is why many studies concerning the contaminants' immunotoxicity are currently in progress.
Tipo: Text Palavras-chave: Polluant; Calicum; Hemocytes; Crassostrea gigas.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-2855.pdf
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Réalisation d'un modèle de dispersion d'un rejet de dragage et des contaminants associés. Rapport définitif: contrat « LITEAU » 2ème phase ArchiMer
Alzieu, Claude; Andral, Bruno; Bassoullet, Philippe; Boutier, Bernard; Gonzalez, Jean-louis; Huet, Martial; Jestin, Herve; L'Yavanc, Jacky; Michel, Pierre; Paulet, Yves-marie; Quiniou, Francoise; Silva Jacinto, Ricardo.
Le projet à pour but de modéliser la dispersion des immersions des boues de dragage, à partir de modèles numériques de manière à pouvoir évaluer le devenir de la charge particulaire et des contaminants associés. Les résultats des expérimentations en laboratoire montrent, qu'à l'échelle représentative du temps de séjour des particules dans la colonne d'eau du champ proche (quelques heures), on ne constate pas de solubilisation des métaux. La libération de la fraction associée aux eaux interstitielles et les flux à l'interface eau-sédiment (diagenèse précoce) après dépôt des sédiments rejetés, sont les processus qui pourraient être la cause d'un apport important de Cd (ou autre contaminant) dissous dans le milieu. Les hypothèses retenues pour l'élaboration...
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00075/18621/16172.pdf
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POMME. Reconstruction des champs 4D. Analyse basée sur les profils et mesures eulériennes - Expériences 7 et 9 ArchiMer
Gaillard, Fabienne; Kermabon, Catherine; Mercier, Herle.
We present here the synthesis of in-situ observations and satellite data analyzed with Soprane, as obtained with the Kalman filter.
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00283/39402/37847.pdf
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Evidence for an additional Heinrich event between H5 and H6 in the Labrador Sea ArchiMer
Rashid, H; Hesse, R; Piper, Djw.
An additional Heinrich ice-rafting event is identified between Heinrich events 5 and 6 in eight cores from the Labrador Sea and the northwest Atlantic Ocean. It is characterized by sediment rich in detrital carbonate (40% CaCO3) with high concentration of floating dropstones, high coarse-fraction (% > 150 mum) content, and has a sharp contact with the underlying but grades into the overlying hemipelagic sediment. It also shows lighter delta(18)O(Npl) values, indicating freshening due to iceberg rafting and/or meltwater discharge. This event is correlated with Dansgaard-Oeschger event 14 and interpreted as an additional Heinrich event, H5a. The thickness of H5a in the Labrador Sea reaches up to 220 cm. This additional Heinrich event has also been...
Tipo: Text Palavras-chave: Heinrich events; Nepheloid flow deposits; GISP2; Dansgaard-Oeschger cycle; Labrador Sea.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00225/33658/32098.pdf
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Rapport d'activités 2003 de la station Ifremer de la Tremblade ArchiMer
Shellfish research laboratory in Pertuis Charentais (France) present the main results concerning its activity during the year 2003. Water quality monitoring, growth, mortality and condition indices are performed on oysters ansd mussels all along the year. Shellfich stock assessment and its spatial distribution, summer mortalities events are the main research topics developped
Tipo: Text Palavras-chave: Stock; Mortality; Growth; Hydrology; Mussel culture; Stock; Mortalité; Croissance Organisme; Hydrologie; Conchyliculture.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-333.pdf
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