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| Registros recuperados: 168 | |
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| Smolarz, Kasia; Renault, Tristan; Soletchnik, Patrick; Wolowicz, Macciek. |
| Using flow cytometry, 234 Macoma balthica were examined during a survey to determine frequency of neoplasia in the Gulf of Gdansk (Poland). Clams were collected in 4 locations and DNA content in gill tissue cells was determined by flow cytometry using propidium iodide staining. Cell permeabilization was induced by osmotic shock. Prevalence of neoplasia ranged from 9.6 to 26.7 % depending on location. DNA content in aneuploid cells was higher than in normal dividing cells. The fluorescence value for aneuploid cells corresponded to tetraploid/pentaploid cells. Three stages of neoplasia were defined, based on the percentage of aneuploid cells determined by flow cytometry. Histopathological and cytogenetic analyses were also carried out on the same clams for... |
| Tipo: Text |
Palavras-chave: Prevalence; Macoma balthica; Flow cytometry; Gill neoplasia. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-2919.pdf |
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| Razet, Daniel; Faury, Nicole; Soletchnik, Patrick; Geairon, Philippe; Le Moine, Olivier; Goulletquer, Philippe. |
| Monitoring hydrology is an essential part of studying an ecosystem such as the Marennes-Oléron Bay. Since 1977, bimonthly samples have been taken from five stations in the bay. These samples provide important information on physical characteristics (temperature, oxygen, salinity), nutrients (NH4, NO3, NO2, SiO3, PO4) and particulate matter composition (seston, chlorophyll a and pheophytin). |
| Tipo: Text |
Palavras-chave: Hydrologie; Marennes Oléron; Hydrobiologie. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3250.pdf |
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| Samain, Jean-francois; Degremont, Lionel; Soletchnik, Patrick; Haure, Joel; Bedier, Edouard; Ropert, Michel; Moal, Jeanne; Huvet, Arnaud; Bacca, Helene; Van Wormhoudt, A; Delaporte, Maryse; Costil, K; Pouvreau, Stephane; Lambert, Christian; Boulo, Viviane; Soudant, Philippe; Nicolas, Jean-louis; Leroux, Frederique; Renault, Tristan; Gagnaire, Beatrice; Geret, Florence; Boutet, Isabelle; Burgeot, Thierry; Boudry, Pierre. |
| Summer mortality of Pacific oysters is known in several countries. However no specific pathogen has been systematically associated with this phenomenon. A complex combination of environmental and biological parameters has been suggested as the cause and is now starting to be identified. A high genetic basis was found for survival in oysters when a first generation (G1) was tested in three sites during summer. This paper presents a synthesis on physiological characteristics of two selected groups ('R' and 'S', from families selected for resistance and susceptibility to summer mortality respectively), of the second and third generations. R and S showed improvement or reduction of survival compared with the control in both field and laboratory trials... |
| Tipo: Text |
Palavras-chave: ROS; Temperature; Stress; Hemocytes; Reproduction; Genetic selection; Resistant oyster; Crassostrea gigas; Pacific Oyster; Summer mortality. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2809.pdf |
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| Soletchnik, Patrick; Ropert, Michel; Grangere, Karine; Munaron, Dominique; Struski, C.. |
| The role of freshwater is more difficult to comprehend. It might act as a detrital organic matter "vector" (during floods) or an anthropic waste "vector" (toxic molecules from agriculture or other industries; nutritive salts from leaching...). Its effect has been demonstrated in the Bay of Veys (Ropert and Kopp, 2000; Misko, 2003), and especially its intense but transient action, presenting high freshenings, as recorded by high-frequency multiparameter probes since 1996 [15]. On this oyster culture site, mortality could then result from osmotic shocks. The "mortality-flow" relationship, demonstrated in 2003 in the Bay of Veys (Misko 2003), has to be specified. It is found in a more sustained way in the Marennes Oléron Bay (R2 = 0.40). This result also... |
| Tipo: Text |
Palavras-chave: MOREST; Impact; Physiologie; Pluviométrie; Apport eau douce; Mortalités; Crassostrea gigas; Huîtres. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3409.pdf |
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| Soletchnik, Patrick. |
| Au cours de l’année 2001, dans le cadre de la première année du programme national Morest sur les mortalités estivales d’huîtres creuses, Crassostrea gigas, le laboratoire conchylicole du Poitou-Charentes a été amené à travailler sur plusieurs opérations : les différents types de mortalité, leur caractérisation sur les trois sites ateliers du programme (Baie des Veys, rivière d’Auray et banc de Perquis dans le sud du bassin de Marennes), la caractérisation des familles génétiques produites en écloserie et la cinétique de mortalité sur le site de Fouras : secteur de captage traditionnel dans le bassin de Marennes. Enfin, des tests ont été réalisés sur les naissains produits en écloserie afin de tenter des trouver un indicateur physiologique de leur... |
| Tipo: Text |
Palavras-chave: Mortalité estivale; Huîtres creuses; Crassostrea gigas; Bassin de Marennes Oléron; MOREST. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00164/27548/25713.pdf |
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| Soletchnik, Patrick; Goulletquer, Philippe; Cochennec, Nathalie; Renault, Tristan; Geairon, Philippe. |
| A population of Pacific ovsters, Crassostrea gigas, infected with a Chlamydia-like procaryote was reared to compare infection trends under three different feeding conditions: a starved condition, an intermediate condition with a diet of Skeletonema costatllm, and a mixed algal diet. Several physiological and pathological criteriJ: presence of gill abnormality; microscopic examination, basophilic intracytoplasmic inclusions, Feulgen reaction; condition index, filtration, food consumptiQn; fecal production and respiration were used to compare the various modalities one month after the initiation of the experiment. The Irodality of starved oysters showed reduce physiological performances in terms of scope for growth and condition index compared to oysters... |
| Tipo: Text |
Palavras-chave: Pathogen; Chlamydia; Procaryote; Crassostrea gigas; Oyster; Ecophysiology; Pathogène; Chlamydia; Procaryote; Crassostrea gigas; Huître; Ecophysiologie. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/publication-2741.pdf |
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| Pepin, Jean-francois; Benabdelmouna, Abdellah; Bierne, Nicolas; Costes, Louis; Degremont, Lionel; Garcia, Celine; Guesdon, Stephane; Lamy, Jean-baptiste; Le Moine, Olivier; Morga, Benjamin; Normand, Julien; Robert, Stephane; Saunier, Alice; Soletchnik, Patrick; Travers, Marie-agnes. |
| Depuis 2014, des épisodes de mortalité anormale affectent les cheptels mytilicoles tant adultes que juvéniles. Dès l’année 2015, une étude spécifique cofinancée par la DPMA et réalisée par l’Ifremer a été initiée, l’action de recherche MORBLEU (Mortalité des moules Bleues). Les années 2015 et 2016 ont permis de dégager des éléments de connaissance et des pistes relatifs aux facteurs biotiques et abiotiques qui semblent intervenir dans le phénomène de hausse de mortalité des moules depuis 2014. Pour l’année 2017, les trois objectifs principaux étaient de : i) poursuivre la description du phénomène de mortalité ainsi que le contexte environnemental associé en effectuant une nouvelle campagne d’études et d’observations in situ, ii) tester des hypothèses... |
| Tipo: Text |
Palavras-chave: Moules; Mytilus edulis; Mortalité; Statut cytogénétique; Anomalies génomiques; Populations; Facteurs environnementaux; Ecologie microbienne. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00503/61503/65337.pdf |
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| Grizel, Henri; Renault, Tristan; Cochennec, Nathalie; Tige, Gilbert; Audic, Guylaine; Pichot, Yves; Chollet, Bruno; Goulletquer, Philippe; Soletchnik, Patrick; Geairon, Philippe; Prou, Jean. |
| Le cheptel d'huîtres creuses, Crassostrea gigas, du Bassin de Marennes-Oléron a subi ces dernières années des morta lités (mai 88, mai 91, été 1992 et hiver 92-93). Les examens histopathologiques pratiqués durant celles-ci n'ont pas permis de déceler d'agents pathogènes. Les causes avaient été attribuées essentiellement, pour les premiers cas, à un manque de nourriture corrélé avec des conditions de sécheresse (donc un manque d'apport d'eau douce pour le bassin) et à des surcharges trop importantes des biomasses de fiItreurs, huîtres y compris. L'explication du dernier cas de mortalité survenue au cours de l'hiver serait d'un autre ordre: l'abaissement brutal des salinités, notamment dans les claires où étaient épurées soit des huîtres natives fragilisées,... |
| Tipo: Text |
Palavras-chave: Etude zoosanitaire; Mortalité; Epidémiologie; Pathologie; Marennes Oléron. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00050/16152/13635.pdf |
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| Ropert, Michel; Lefebvre, Sebastien; Soletchnik, Patrick; Blin, J. L.; Faury, Nicole; Struski, Caroline. |
| The "trophic risk" has been demonstrated in the bioenergetic model developed in vivo and based on various diet conditions similar to those of different types of oyster culture basins (eutrophic, heterotrophic and oligotrophic) [22, 23]. The trophic resource mortality relationship differs from one basin to another, according to the quantity of this resource. Multy-varied analysis (ACP) conducted on a total of 11 oyster culture sites and handled in a database matching mortality and environmental data, show that the trophic indicator "chlorophyll a" (often coupled with temperature) is involved in a positive correlation with the mortality of both age classes (1 and 2 years old). The stock transfer from the Bay of Veys to the west coast of Cotentin in spring... |
| Tipo: Text |
Palavras-chave: MOREST; Crassostrea gigas; Physiologie; Phéopigments; Ressources trophiques; Modèle bioénergétique; Mortalités; Huîtres. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3410.pdf |
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| Le Moine, Olivier; Soletchnik, Patrick; Geairon, Philippe; Razet, Daniel; Faury, Nicole; Goulletquer, Philippe. |
| Since 1988, seasonal, chronic mortality (up to 30-40 %) has been occurring at oyster farms in the Marennes-Oléron Bay, namely at the Ronce and Perquis sand flats. The particular geographic position on the southern part of the bay, between the Seudre River and the Maumusson Strait, confers a relative specificity to these oyster farming areas. Production in this area is on the order of 8,000 to 10,000 t of the 30,000 t of oysters produced annually in the Bay. Although limited in surface area (180 ha out of a total of 4,500 ha), this high proportion of production can be attributed to the fact that this zone is mostly dedicated to the finishing process before commercialisation. Due to its economic importance, oyster farming is vital for local businesses. |
| Tipo: Text |
Palavras-chave: Marennes Oléron; Mortalités; Crassostrea gigas. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3249.pdf |
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| Soletchnik, Patrick; Le Moine, Olivier; Geairon, Philippe; Faury, Nicole; Razet, Daniel; Robert, Stephane; Prou, Jean. |
| The objectives for 2004: - Continuation of the study of the "on-bottom/off-bottom" mortality south of the Marennes Oléron Bay with a study of acute stress (sequel to Dynamo & DynamoR studies) (WP 2.2.8). - Continuation of the laboratory analysis of the dynamoR 2003 samples (biological material) and data (WP 2.2.3). - Analysis of the data on the characterisation of summer mortality (WP 2.2.1) in relation to the environment. Through these tasks, the objectives are: (1) understanding the "on-bottom/off-bottom" mortality model of C. gigas in the Marennes Oléron Bay and underlining the environmental causes of summer mortality, (2) bringing a regional answer to this issue, (3) widening the study of the mortality / environment relationship to all the French... |
| Tipo: Text |
Palavras-chave: Ecosystèmes conchylicoles; Modélisation; Bassin de Marennes Oléron; MOREST; Mortalités; Crassostrea gigas; Huîtres. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3388.pdf |
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| Le Moine, Olivier; Geairon, Philippe; Soletchnik, Patrick; Faury, Nicole; Goulletquer, Philippe; Robert, Stephane; Razet, Daniel; Heurtebise, Serge. |
| Thiis report aims to study the oyster Crwsosrrea gigas growth and production over a 12 years time' s span in the bay of Marennes-DIeron. Results of 12 years of oyster growlh did not show any significant oyster biological productivity decrease, nor trend. ln contrast, annual growth showed a large variability, which will be correlated with environmental conditions. Moreover, annual growth variability was greater than the variability due to site location,. besides the Ronce experimental site. The later, located in the south west part of the bay of Marennes-Dleron, has been the leading oyster growth site since 1989. The annual shell growlh variabiliry was greater than oyster dry meat weight fluctuation . Both 1990 and 1991 years were characterized by the... |
| Tipo: Text |
Palavras-chave: Réseau de surveillance; Croissance; Composition biochimique; Mortalité; Crassostrea gigas; Bassin de Marennes-Oléron; Charente-Maritime; Monitoring network; Growth; Biochemical composition; Mortality rate; Crassostrea gigas; Bay of Marennes Oleron; Charente-Maritime. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00031/14244/11520.pdf |
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| Soletchnik, Patrick; Heral, Maurice; Razet, Daniel; Geairon, Philippe. |
| Dans le cadre des études de physiologie, la fonction de filtration intervient dans le calcul du bilan énergétique, ou permet de déterminer la quantité d'aliment consommé par les mollusques filtreurs. Cette fonction peut également être considérée dans les relations avec le poids de l'animal, la température et un certain nombre d'indices de qualité et de quantité de l'aliment dont se nourrit le bivalve. Dans un contexte de coopération internationale entre scientifiques anglais, espagnols et français, une expérimentation physiologique sur les mollusques a été réalisée en septembre 1991 à l'IFREMER La Tremblade. De nombreux objectifs motivent cette expérimentation : la comparaison inter espèces, la confrontation des techniques mises en oeuvre par les... |
| Tipo: Text |
Palavras-chave: Physiologie; Filtration; Huître creuse; Crassostrea gigas; Alimentation. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00102/21303/18916.pdf |
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| Soletchnik, Patrick; Le Moine, Olivier; Geairon, Philippe; Razet, Daniel; Goulletquer, Philippe; Faury, Nicole; Fouche, Dominique; Gras, Paul. |
| Traditionnellement pratiqué dans les marais maritimes autour du bassin de Marennes Oléron, l'affinage des huîtres en claires est destiné à améliorer leur qualité tant d'un point de vue organoleptique et engraissement que du durcissement des animaux. Le but recherché est d'obtenir un gain de poids de chair, une augmentation des réserves glucidiques, une saveur particulière, et un renforcement de la coquille. La claire ostréicole constitue par ailleurs une zone de stockage privilégiée du cheptel avant la commercialisation de la production au cours de la deuxième quinzaine du mois de décembre. Le savoir faire empirique des professionnels ne permet pas de pallier la variabilité importante des caractéristiques de ces élevages, assujettis aux variations... |
| Tipo: Text |
Palavras-chave: Claires ostréicoles; Huîtres creuses; Crassostrea gigas; Affunage; Zootechnie; Production phytoplanctonique; Ressources trophiques; Marennes Oléron. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00199/31007/29410.pdf |
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| 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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| Registros recuperados: 168 | |
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