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Effets d'un mélange de pesticides sur les hémocytes d'huître creuse, Crassostrea gigas. ArchiMer
Gagnaire, Beatrice; Geret, Florence; Haure, Joel; Martin, Jean-louis; Burgeot, Thierry; Thomas-guyon, Hélène; Renault, Tristan.
Shellfish industry is often realised in estuarine areas, subjected to pollutions due to agricultural activities. The harmful effects of pesticides on animals inhabiting these estuarine zones are poorly documented. Bivalve molluscs represent an interesting model because they are sedentary and they filter water intensively. Effects of pesticides on haemocytes functions were tested in Pacific oyster, Crassostrea gigas and analysed by flow cytometry. A combination of pesticide at environmental concentrations was tested in vivo. Animals used corresponded to two genetically selected populations produced in hatchery.
Tipo: Text Palavras-chave: Haemocytes; Flow cytometry; Pesticides; Crassostrea gigas.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-924.pdf
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Environment and immunomodulation : effects of the soluble fraction of Norwegian heavy fuel on the immune system of Pacifc oyster, Crassostrea gigas ArchiMer
Bado-nilles, Anne; Auffret, Michel; Quentel, Claire; Le Floch, Stéphane; Arzel, Jacqueline; Gagnaire, Beatrice; Renault, Tristan; Thomas-guyon, Hélène.
Estuaries and coastal areas are often subjected to much pollution, including pesticides and polycyclic aromatic hydrocarbons (PAHs) produced by anthropic activities. Bay of Marennes-Oléron is an estuarine coastal zone in which there is a high level of aquacultural production and this has adverse effects in aquatic organisms. In fact, PAHs, which are widely spread throughout aquatic ecosystems, have a low polarity and so there is a clear tendency to bioaccumulate in marine organisms (1). The harmful effects of such contaminants on the organism's immune system, leading to a decreased resistance to pathogens, is a relatively new area of research and it still poorly understood. The aim of the present work was to detect the impact in vivo of PAHs on the immune...
Tipo: Text Palavras-chave: PaHs; Contamination; Crassostrea gigas; Oyster.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3428.pdf
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Environment and immunomodulation : effects of the soluble fraction of Norwegian heavy fuel on the immune system of Sea bass, Dicentrarchus labrax ArchiMer
Bado-nilles, Anne; Quentin, Claire; Le Floch, Stéphane; Arzel, Jacqueline; Auffret, Michel; Gagnaire, Beatrice; Renault, Tristan; Thomas-guyon, Hélène.
Estuaries and coastal areas are often subjected to much pollution, including pesticides and polycyclic aromatic hydrocarbons (PAHs) produced by anthropic activities. Bay of Marennes-Oléron is an estuarine coastal zone in which there is a high level of aquacultural production and this has adverse effects in aquatic organisms. In fact, PAHs, which are widely spread throughout aquatic ecosystems, have a low polarity and so there is a clear tendency to bioaccumulate in marine organisms (1). The harmful effects of such contaminants on the organism's immune system, leading to a decreased resistance to pathogens, is a relatively new area of research and it still poorly understood. The aim of the present work was to detect the impact in vivo of PAHs on the immune...
Tipo: Text Palavras-chave: PaHs; Fish; Contamination; Dicentrarchus labrax.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3427.pdf
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Environmental stress in the pacific oyster Crassostrea gigas during gametogenesis : role of herbicides? ArchiMer
Burgeot, Thierry; Quirion, Sophie; Quiniou, Francoise; Knoery, Joel; Soletchnik, Patrick; Gagnaire, Beatrice; Renault, Tristan; Osada, M.; Geret, F.; Communal, P. Y.; Jadas-hecart, A.; Gagne, F..
In the Atlantic French coast, significant mortalities were observed in oyster communities during gametogenesis. These deaths possibly result from the cumulative effects of various stressors such as seasonal temperature variations, pesticide application and the release of contaminants from the resuspension of sediments. A field survey, based on aquaculture conditions at 15 and 70 cm from the sediment bed with genetically-resistant (R) and -sensitive (S) lines, showed a stress condition. Significant weight loss was observed during May 14th through June 10th for both R and S lines. On one hand, the levels of the egg yolk vitellin in females were decreased at May 14th for both R and S lines. On the other hand, a significant increase in vitellin production was...
Tipo: Text Palavras-chave: Mortalities; Herbicides; Sediment; Biomarkers; Gametogenesis; Crassostrea gigas; Pacific oysters.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3384.pdf
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Epidémiologie analytique et descriptive des agents pathogènes, étude de la diversité des virus de type herpès (action 1). Etude des relations hôtes/agents pathogènes, pathogénèse des infections à virus de type herpèsvirus (action 2) - Contrat Région Poitou-Charentes 2000-2006 ArchiMer
Renault, Tristan; Le Roux, Frederique; Berthe, Franck; Arzul, Isabelle; Miossec, Laurence; Robert, Maeva; Chollet, Bruno.
Nous disposons aujourd'hui d'o utils diagnostiques sensibles et spécifiques (PCR, HIS ... ) et d'un protocole de transmission de l' infection qui permettent d'assurer un suivi des productions larvaires en écloserie de bivalves pour les espèces considérées comme sensibles aux infections à herpèsvirus, mais également pour de nouvelles espèces. En effet, des mortalités massives (100 %) ont été rapportées dans une écloserie de coquille St-Jacques en Bretagne et ont pu être associées à la détection de OsHV -1. Les résultats obtenus concernant cette espèce, Pecten maximus, complètent et reflètent l'ensemble des travaux réalisés.
Tipo: Text Palavras-chave: Pathologie; Epidémiologie; Virus; Herpès virus; Bivalves; Crassostrea gigas; Ruditapes philippinarum; Pecten maximus.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00043/15472/12851.pdf
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Episodes de mortalité massive de moules bleues observés en 2014 dans les Pertuis charentais ArchiMer
Bechemin, Christian; Soletchnik, Patrick; Polsenaere, Pierre; Le Moine, Olivier; Pernet, Fabrice; Protat, Martin; Fuhrmann, Marine; Quere, Claudie; Goulitquer, Sophie; Corporeau, Charlotte; Lapegue, Sylvie; Travers, Marie-agnes; Morga, Benjamin; Garrigues, Manon; Garcia, Celine; Haffner, Philippe; Dubreuil, Christine; Faury, Nicole; Baillon, Laury; Baud, Jean-pierre; Renault, Tristan.
Mass mortality outbreaks (90-100%) in both juvenile and adult blue mussels were reported in 2014 along the Pertuis Charentais area of the French Atlantic coast. A series of studies were carried out to learn more about the phenomenon through detecting pathogens, describing environmental conditions and establishing the physiological status of the animals. Bacteria identif ied as belonging to the V. splendidus species were detected in dying mussels and seem able to cause mortality in blue mussels in the laboratory. Unusual environmental conditions (large amounts of fresh water, re-suspension of sediments during a series of storms, and a high renewal rate of specific water masses in Brittany’s Pertuis area) may be partially responsible for sparking the phenomen
Tipo: Text Palavras-chave: Mortalités; Moules; Pertuis Charentais; Vibrio splendidus; Environnement; Mortality; Mussels; Pertuis Charentais; Vibrio splendidus; Environment.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00312/42343/41682.pdf
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Essai d'acclimatation de Crassostrea virginica et performances biologiques comparées avec Crassostrea gigas (1ère partie) ArchiMer
Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Nourry, Max; Renault, Tristan; Cochennec, Nathalie.
Premier volet du programme d'essai d'acclimatation de l'huître américaine Crassostrea virginica, ce rapport présente les actions et les résultats de l'année 1992 qui a été consacrée à : • l'importation selon les normes du CIEM d'un lot de 50 huîtres en provenance d'Angleterre, • leur élevage en salle de quarantaine et leur conditionnement en vue d'une accélération de la maturation sexuelle, • l'obtention d'une première génération, ainsi que son suivi en élevage larvaire et en micronurserie à l'URGE-La Tremblade, • au contrôle des performances comparées des deux populations de C. virginica et de C. gigas en nurserie de prégrossissement à l'URRA-Bouin pendant toute la période automnale et hivernale. Au terme de cette première année d'étude il apparait que la...
Tipo: Text Palavras-chave: Mollusques; Acclimatation; Crassostrea virginica; Crassostrea gigas; Génétique; Pathologie.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00077/18843/16417.pdf
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Essai d'acclimatation de Crassostrea virginica et performances biologiques comparées avec Crassostrea gigas (2ème partie) ArchiMer
Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Heurtebise, Serge; Nourry, Max; Renault, Tristan; Cochennec, Nathalie; Zanette, Yvan; Blachier, Philippe.
Deuxième volet du programme d'essai d'acclimatation de l'huître américaine Crassostrea virginica, ce rapport présente les actions et les résultats de l'année 1993 qui a été consacrée au suivi des performances comparées de croissance des populations de C. gigas et C. virginica produites en 1992, ceci en trois sites différents: • dans le bassin de Marennes-Oléron en claire et sur estran, à la station IFREMER de Bouin en élevage intensif, au CREAA sur l'Ile d'Oléron en marais extensif. Au terme de cette seconde année d'étude, il est d'ores et déjà possible d'affirmer que que la souche anglaise de C. virginica étudiée ne présente pas de caractéristiques de croissance susceptibles de la rendre compétitive par rapport au témoin Crassostrea gigas et cela d'autant...
Tipo: Text Palavras-chave: Mollusques; Acclimatation; Crassostrea virginica; Crassostrea gigas; Génétique; Pathologie.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00077/18846/16419.pdf
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Establishing causal link between an infectious agent and mortalities in marine molluscan aquaculture on the example of Bonamia ostreae and Herpèsvirosis in oysters : proposal of a causal grid analysis ArchiMer
Thebault, Anne; Cochennec, Nathalie; Arzul, Isabelle; Renault, Tristan.
In marine molluscan aqauculture, infectious agents are regularly cited in literature associated with mass mortalities as emergin diseases, but the causal link is often based on very few argumeents. 24 ways to demonstrate causal links from epidemiolgical, ecological and marine pathology literature feasible for marine molluscs are given. Those criteria were applied to the ewample of Bonamia ostreae for Ostrea edulis and Herpesvirus for spats and larvae of Crassostrea gigas. Three principles could be applied in marine field for choosing criteria wich should be taken in priority : the demonstration must be given at three levels of organization, organ individual, population, the demonstration must keeps maximum epidemiological criterias, and then mixes...
Tipo: Text Palavras-chave: Herpesvirus; Bonamia ostrea; Crassostrea gigas; Ostrea edulis; Marine pathology; Ecology; Epidemiology; Infectious agents; Molluscan aquaculture.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3341.pdf
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Etude de l'herpès virus de l'huître - Fonds d'Aide à la Recherche et à l'Innovation - Décision d'Aide à la Recherche n° 95-07-01 - Rapport Final Août 1998 ArchiMer
Renault, Tristan.
Depuis 1991, des mortalités massives sporadiques sont rapportées, en France, de manière régulière chez des larves et des juvéniles de différentes espèces de mollusques bivalves marins. Certains de ces épisodes de mortalité ont pu être associés à la détection de virus. Ces derniers par leur morphologie, leur cycle de réplication et leur localisation ont été apparentés à la famille des Herpesviridae. Cependant, les outils de diagnostic disponibles jusqu'alors (histologie et microscopie électronique à transmission) n'étaient pas adaptés à l'étude de ces virus du fait de leur manque de spécificité et de la lourdeur de leur mise en œuvre. Par ailleurs, se posait la question de l'implication des virus détectés dans les phénomènes de mortalité observés. En effet,...
Tipo: Text Palavras-chave: Virus; Pathologie; Herpès virus; Crassostrea gigas; Pathogène; Herpesviridae.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00043/15451/12826.pdf
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Etude de l'herpès virus de l'huître. Fonds d'Aide à la Recherche et à l'Innovation. Décision d'Aide à la Recherche n° 95-07-01 (Rapport intermédiaire) ArchiMer
Renault, Tristan.
L'Unité de Recherche en Pathologie et Immunologie Générales (Station IFREMER de La Tremblade) se propose dans le présent projet d'étudier le virus de type herpès observée chez les huîtres (pouvoir pathogène, conditions d'expression de l'infection, transmission, etc ... ) et de développer des réactifs permettant de réaliser un diagnostic rapide, sensible et fiable de l'infection qu'il occassionne. Les diagnostics proposés seront basés sur la détection directe du virus, soit au moyen de réactifs immunologiques spécifiques des antigènes viraux, soit par des techniques de biologie moléculaire permettant de détecter l'ADN viral (hybridation de sondes nucléiques et réaction PCR : Polymerase Chain Reaction). Ce projet, proposé sur une durée de trois années...
Tipo: Text Palavras-chave: Virus; Herpès; Pathogène; Purification; Herpesviridae; Crassostrea gigas.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00043/15447/12818.pdf
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Etude de l'herpès virus de l'huître. Fonds d'Aide à la Recherche et à l'Innovation. Décision d'Aide à la Recherche n° 95-07-01 (Rapport intermédiaire) 1997 ArchiMer
Renault, Tristan.
Le Laboratoire de Génétique, Aquaculture et Pathologie (GAP) de la Station IFREMER de La Tremblade, se propose dans le présent projet d'étudier le virus de type herpès observée chez les huîtres (pouvoir pathogène, conditions d'expression de l'infection, transmission, etc ... ) et de développer des réactifs permettant de réaliser un diagnostic rapide, sensible et fiable de l'infection qu'il occasionne. Les diagnostics proposés seront basés sur la détection directe du virus, soit au moyen de réactifs immunologiques spécifiques des antigènes viraux, soit par des techniques de biologie moléculaire permettant de détecter l'ADN viral (hybridation de sondes nucléiques et réaction PCR : Polymerase Chain Reaction). Ce projet, proposé sur une durée de trois années...
Tipo: Text Palavras-chave: Virus; Herpès virus; Crassostrea gigas; Pathogènes; Diagnostic; Herpesviridae.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00043/15448/12821.pdf
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Etude de l'herpès virus de l'huître - Fonds d'Aide à la Recherche et à l'Innovation - Décision d'Aide à la Recherche n° 95-07-01 - Rapport intermédiaire 1998 ArchiMer
Renault, Tristan.
Le Laboratoire de Génétique, Aquaculture et Pathologie (GAP) de la Station IFREMER de La Tremblade, se propose dans le présent projet d'étudier le virus de type herpès observée chez les huîtres (pouvoir pathogène, conditions d'expression de l'infection, transmission, etc ... ) et de développer des réactifs permettant de réaliser un diagnostic rapide, sensible et fiable de l'infection qu'il occasionne. Les outils de diagnostic développés sont basés sur la détection directe du virus, soit au moyen de réactifs immunologiques spécifiques des antigènes viraux, soit par des techniques de biologie moléculaire permettant de détecter l'ADN viral (hybridation de sondes nucléiques et réaction PCR). Ce projet, proposé sur une durée de trois années (1995-1998),...
Tipo: Text Palavras-chave: Virus; Pathologie; Herpès virus; Crassostrea gigas; Pathogène; Herpesviridae.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00043/15450/12825.pdf
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Etude des agents pathogènes et épidémiologie ArchiMer
Renault, Tristan; Le Roux, Frederique; Berthe, Franck; Robert, Maeva; Chollet, Bruno; Gerard, Andre.
Le programme 4 portant sur la pathologie des coquillages dans le cadre d'une gestion durable des productions ostréicoles, comporte 2 actions principales réparties en une étude d'épidémiologie analytique et descriptive des agents pathogènes (Action 1), et l'étude des relations hôtes/agents pathogènes (Action 2). Les résultats 2001 présentés ici sont relatifs à ces 2 actions, avec notamment des informations sur les infections à virus de type herpès, et de recherche de bactéries pathogènes chez Crassostrea gigas lors des épisodes de mortalités estivales. Par ailleurs, l'émergence d'un programme national, intitulé MOREST (pour Mortalités Estivales) sur l' huître creuse C. gigas va permettre de rappeler le contexte scientifique des relations hôtes/pathogènes.
Tipo: Text Palavras-chave: Pathologie; Agents pathogènes; Epidémiologie; Huître creuse; Crassostrea gigas.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00199/31011/29414.pdf
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Etude des intéractions entre le parasite Bonamia ostreae et son hôte, huître plate Ostrea edulis in vitro ArchiMer
Morga, Benjamin; Arzul, Isabelle; Chollet, Bruno; Gagnaire, Beatrice; Renault, Tristan.
Bonamiosis is a disease affecting the flat oyster Ostrea edulis and caused by the protozoa parasite Bonamia ostreae, which is affiliated to the haplosporidia order and the cercozoa phylum. This parasite is mainly intracellular, infecting haemocytes, circulating cells playing an important role in the oyster's defence mechanisms. Even though the parasite's cycle has not been completely understood yet, direct infection from infected oysters to healthy oysters is possible. This leads us to think that there is no intermediary host in the cycle. Very little data on the parasite's infection mechanisms or the host's defence mechanisms is available. In order to better comprehend the Bonamia ostreae / host interaction, some flat oyster's haemocytes have been put in...
Tipo: Text Palavras-chave: Hémocytes; Ostrea edulis; Bonamia ostreae; Parasite; Huîtres.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/acte-3368.pdf
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Etude des intéractions entre le parasite Bonamia ostreae et son hôte, huître plate Ostrea edulis in vitro (Diaporama) ArchiMer
Morga, Benjamin; Arzul, Isabelle; Chollet, Bruno; Gagnaire, Beatrice; Renault, Tristan.
Bonamiosis is a disease affecting the flat oyster Ostrea edulis and caused by the protozoa parasite Bonamia ostreae, which is affiliated to the haplosporidia order and the cercozoa phylum. This parasite is mainly intracellular, infecting haemocytes, circulating cells playing an important role in the oyster's defence mechanisms. Even though the parasite's cycle has not been completely understood yet, direct infection from infected oysters to healthy oysters is possible. This leads us to think that there is no intermediary host in the cycle. Very little data on the parasite's infection mechanisms or the host's defence mechanisms is available. In order to better comprehend the Bonamia ostreae / host interaction, some flat oyster's haemocytes have been put in...
Tipo: Text Palavras-chave: Intéraction; Hémocytes; Ostrea edulis; Bonamia ostreae; Parasitologie.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/acte-3366.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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Etude du virus de type herpes observé chez les huîtres ArchiMer
Le Deuff, Rose-marie; Lipart, Cecile; Chollet, Bruno; Haffner, Philippe; Delsert, Claude; Cochennec, Nathalie; Renault, Tristan.
Since 1991, sporadic, but high mortality in larvae of the Pacific oyster (Crassostrea gigas) has been observed during the summer in various French hatcheries. This mortality was concomitant with the detection of a virus by transmission electron microscopy. This virus, by virtue of its morphological characteristics and developmental cycle, seems to belong to the Herpesviridae family. The pathogenicity of this viral agent has been demonstrated in the laboratory by experimentally induced mortality on healthy larvae. Moreover, concomitant mortality has been reported in larvae of Crassostrea gigas and Ostrea edulis reared in the same tanks, with detection of a herpes-type virus.
Tipo: Text Palavras-chave: Virus; Herpeviridae; Pathologie; Crassostrea gigas.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3248.pdf
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Etude in vivo et in vitro des effets du mercure sur la réponse hémocytaire de l'huître creuse, Crassostrea gigas : développement de techniques évaluant les impacts de la pollution estuarienne ArchiMer
Gagnaire, Beatrice; Renault, Tristan; Thomas-guyon, Hélène.
In the last decades, shellfish industry represents an important economic activity in France and particularly in Charente-Maritime. Marennes-Oleron basin is the first French area of oyster production, especially Pacific oyster, Crassostrea gigas. But this area is also subjected to many pollution due to anthropic activities. Industrial wastes are sources of mercury pollution in the Charente river. The harmful effects of such contaminants on animals inhabiting these estuarine zones are poorly known, although many studies begin to be developed. Most of these studies use bivalve molluscs as biological indicators : these animals can bioaccumulate pollutants within their tissues by filtration. Moreover, they are sedentary so they cannot escape in the case of a...
Tipo: Text Palavras-chave: Flow cytometry; Haemocytes; Mercury; Crassostrea gigas; Cytométrie de flux; Hémocytes; Mercure; Crassostrea gigas.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/acte-830.pdf
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Etude pluridiciplinaire de la DYNAmique des MOrtalités estivales dans le bassin de Marennes- Oléron : Dynamique des mortalités en relation avec la reproduction in situ et la température - Suivi de paramètres hémocytaires - Synergie écologie côtière et activité hémocytaire ArchiMer
Renault, Tristan; Soletchnik, Patrick; Le Moine, Olivier; Faury, Nicole; Guilpain, Patrice; Geairon, Philippe; Razet, Daniel; Seugnet, Jean-luc; Gagnaire, Beatrice; Kerdudou, Nolwenn.
Massive abnormal mortalities of flat oysters Crassostrea during the summer period are nothing new, and such episodes have been described in scientific literature for about forty years. Numerous studies demonstrate that there is not one single identified cause to this phenomenon and that it is, on the contrary, a combination of different parameters. This program proposes a multidisciplinary approach to the problem of summer mortality of C. gigas in which the working hypothesis is that these mortalities result from the interaction of three parameters: environment, host and pathogens. As a consequence, this program gathers all the necessary competences for the study of these interactions: competences in genetics, physiology, immunology, ecotoxicology,...
Tipo: Text Palavras-chave: Marennes Oléron; Activité hémoctyaire; Synergie écologie côtière; Pathologie; Paramètres hémocytaires; Physiologie; Paramètres; Reproduction; Mortalités; Crassostrea gigas; Huîtres.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/acte-3404.pdf
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