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Bilan des essais d'élevage du pétoncle noir, Chlamys vria (Linné) dans le Bassin d'Arcachon France ArchiMer
Robert, Rene; Trut, Gilles; Laborde, Jean-louis; Miner, Philippe.
Until 1960, the black scallop Chlamys varia (Linné, 1758) was largely distributed over the French Atlantic coast. Nowadays, most of the deposits are gone. Since controlled mollusc reproduction techniques are now relatively mastered, some reimplatation attempts have been conducted on a number of oyster culture sites, including the Arcachon Bay, from 1989 to 1992. Despite some good results in hatchery and nursery, the rearing attempts failed. If some good growth rates have been monitored in the Arcachon Bay over these three years, these performances have been frustrated by very high mortality rates occurring shortly after the setting up of the farms. Although this species is known to be relatively sensitive to environmental factors, the hydrobiological...
Tipo: Text Palavras-chave: Bassin Arcachon; Elevage; Chlamys varia; Pétoncle.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/publication-6193.PDF
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Bioactive extracellular compounds produced by the dinoflagellate Alexandrium minutum are highly detrimental for oysters ArchiMer
Castrec, Justine; Soudant, P.; Payton, L.; Tran, D.; Miner, Philippe; Lambert, C.; Le Goic, N.; Huvet, Arnaud; Quillien, Virgile; Boullot, F.; Amzil, Zouher; Hegaret, Helene; Fabioux, C..
Blooms of the dinoflagellate Alexandrium spp., known as producers of paralytic shellfish toxins (PSTs), are regularly detected on the French coastline. PSTs accumulate into harvested shellfish species, such as the Pacific oyster Crassostrea gigas, and can cause strong disorders to consumers at high doses. The impacts of Alexandrium minutum on C. gigas have often been attributed to its production of PSTs without testing separately the effects of the bioactive extracellular compounds (BECs) with allelopathic, hemolytic, cytotoxic or ichthyotoxic properties, which can also be produced by these algae. The BECs, still uncharacterized, are excreted within the environment thereby impacting not only phytoplankton, zooplankton but also marine invertebrates and...
Tipo: Text Palavras-chave: Harmful algal bloom (HAB); Crassostrea gigas; Paralytic shellfish toxins (PST); Bioactive extracellular compounds (BEC); Histology; Behavior.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00435/54637/56042.pdf
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Copepod Grazing Influences Diatom Aggregation and Particle Dynamics ArchiMer
Toullec, Jordan; Vincent, Dorothée; Frohn, Laura; Miner, Philippe; Le Goff, Manon; Devesa, Jérémy; Moriceau, Brivaela.
In marine ecosystems, carbon export is driven by particle flux which is modulated by aggregation, remineralization, and grazing processes. Zooplankton contribute to the sinking flux through the egestion of fast sinking fecal pellets but may also attenuate the flux by tearing apart phytoplankton aggregates into small pieces through swimming activity or direct ingestion. Freely suspended cells, artificial monospecific aggregates from two different diatom species (Chaetoceros neogracile and Skeletonema marinoi) and natural aggregates of Melosira sp. were independently incubated with five different copepod species (Acartia clausi, Temora longicornis, Calanus helgolandicus, Euterpina acutifrons, and Calanus hyperboreus). During the grazing experiments initiated...
Tipo: Text Palavras-chave: Diatom aggregate; Grazing experiment; Copepod; Sinking velocity; Particle dynamics.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00594/70605/68799.pdf
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Effect of a mono-specific algal diet on immune functions in two bivalve species - Crassostrea gigas and Ruditapes philippinarum ArchiMer
Delaporte, Maryse; Soudant, Philippe; Moal, Jeanne; Lambert, Christophe; Quere, Claudie; Miner, Philippe; Choquet, Gwenaelle; Paillard, Christine; Samain, Jean-francois.
The impact of diets upon the fatty acid composition of haemocyte polar lipids and consequently upon immune parameters has been tested in the oyster Crassostrea gigas and the clam Ruditapes philippinarum. Oysters and clams were fed each of three cultured algae: Chaetoceros calcitrans, which is rich in 20:5(n-3) and 20:4(n-6) and poor in 22:6(n-3) fatty acids; T-Iso (Isochrysis sp.), which is rich in 22:6(n-3) and deficient in 20:5(n-3) and 20:4(n-6); and Tetraselmis suecica, which is deficient in 22:6(n-3) and contains only small amounts of 20:5(n-3) and 20:4(n-6). Fatty acid composition of haemocyte polar lipids was greatly affected by the diet. Oysters and clams fed C. calcitrans maintained a higher proportion of 20:5(n-3) and 20:4(n-6) in their haemocyte...
Tipo: Text Palavras-chave: Ruditapes philippinarum; Crassostrea gigas; Polyunsaturated fatty acids; Phagocytosis; Oxidative activity; Haemocyte membrane; Nutrition; Immunology; Bivalve; Immunologie; Bivalve; Ruditapes philippinarum; Crassostrea gigas; Acides gras poly insatures; Phagocytose; Flambee respiratoire; Membrane; Hemocyte; Nutrition.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-354.pdf
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Effect of Rhodomonas salina addition to a standard hatchery diet during the early ontogeny of the scallop Pecten maximus ArchiMer
Tremblay, Rejean; Cartier, Simon; Miner, Philippe; Pernet, Fabrice; Quere, Claudie; Moal, Jeanne; Muzellec, Marie-louise; Mazuret, Michel; Samain, Jean-francois.
The main objective of this study was to identify algal diets that maximize the survival and growth and alter the biochemical content of Pecten maximus larvae with the aim of improving metamorphosis. We also evaluated the potential of the cryptophyceae Rhodomonas salina as a food source for these larvae. Two flagellates, Isochrysis aff. galbana (T) and Pavlova lutheri (P), and two diatoms, Chaetoceros gracilis (C) or Skeletonema costatum (S), were tested as two ternary diets, namely PTC and PTS. PTC and PTS were compared with diets that also included R. salina (R). The addition of R. salina and the replacement of C. gracilis by S. costatum in the traditional hatchery diet seem to be two interesting alternatives for increasing the productivity of larval...
Tipo: Text Palavras-chave: Algal fatty acids and sterols; Energetic content; Metamorphosis; Nutrition; Scallop.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2404.pdf
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Effect of sampling location, release technique and time after activation on the movement characteristics of scallop (Pecten maximus) sperm ArchiMer
Suquet, Marc; Quere, Claudie; Mingant, Christian; Lebrun, Luc; Ratiskol, Dominique; Miner, Philippe; Cosson, Jacky.
Sperm characteristics of scallops have not been well described in the scientific literature. The effects of sperm release technique (thermal shock versus serotonin injection), of sperm collection technique (testis sampling versus serotonin injection), of sperm sampling location along the genital tract, of in vitro sperm maturation, and of time post activation on scallop sperm characteristics were assessed in the present work. Whatever sperm release technique used, no significant differences were observed regarding the percentage of motile spermatozoa and the velocity of the average path (YAP). Compared to testicular sperm, a higher percentage of motile spermatozoa, YAP and intracellular adenosine triphosphate (ATP) content were observed for sperm shed...
Tipo: Text Palavras-chave: Spermatozoa; CASA; Maturation; Sperm motility; Bivalve; Pecten maximus.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26852/24983.pdf
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Effect of shear velocity and flow regimes on scallop post-larval detachment feed on two different diets ArchiMer
Gagne, Renee; Tremblay, Rejean; Olivier, Frederic; Pernet, Fabrice; Miner, Philippe; Samain, Jean-francois.
Through biological flume experiments, we studied the effect of shear velocity and attachment period on the percent detachment of Pecten maximus post-larvae of different sizes reared on two experimental diets. The first diet, (Pavlova lutheri, Isochrysis galbana, Chaetoceros calcitrans), which served as a reference diet (PTC), is commonly used in bivalve hatcheries; the second is the PTC diet with the addition of Rhodomonas salina (PTCR). Our results indicate that the detachment of post-larvae fed PTCR diet showed significant interactions between scallop length, attachment period and shear stress, while the post-larvae feed with the PTC diet showed only effect of shear stress factor. Furthermore, post-larvae exposed to various flume velocities showed...
Tipo: Text Palavras-chave: Attachment; Pecten maximus; Benthic boundary layer; Flume; Diet.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00111/22219/20056.pdf
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Effect of the probiotic strain Phaeobacter gallaeciensis after bacterial challenge on the complete larval development of Pecten maximus ArchiMer
Genard, Bertrand; Larouche, Olivier; Nicolas, Jean-louis; Miner, Philippe; Beaudin, Marie-lou; Tremblay, Rejean.
The aim of this project was to evaluate the impact of probiotic (Phaeobacter gallaeciensis, X34 strain) treatment on the complete development (from veliger to metamorphosis) of Pecten maximus larvae in the context of a bacterial challenge and in conditions more representative of hatchery practices. To that effect, the present study was divided into two main steps. In the first, we used in vitro analyses (antibiograms and microplate assays) to validate the inhibition abilities of X34 on the growth of four Vibrio pathogen species. During the second step, we added pathogens (Vibrio pectenicida) into rearing tanks after two weeks of pre-treatment with the probiotic and then followed the larval development of Pecten maximus through the monitoring of survival...
Tipo: Text Palavras-chave: Probiotics; Hatchery; Bacterial challenge; Larval development; Pecten maximus; Phaeobacter gallaeciensis; Vibrio.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00213/32429/30895.pdf
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Effects of bioactive extracellular compounds and paralytic shellfish toxins produced by Alexandrium minutum on growth and behaviour of juvenile great scallops Pecten maximus ArchiMer
Borcier, Elodie; Morvezen, Romain; Boudry, Pierre; Miner, Philippe; Charrier, Gregory; Laroche, Jean; Hegaret, Helene.
Dinoflagellates of the genus Alexandrium are a major cause of harmful algal blooms (HABs) that have increasingly disrupted coastal ecosystems for the last several decades. Microalgae from the genus Alexandrium are known to produce paralytic shellfish toxins (PST) but also bioactive extracellular compounds (BEC) that can display cytotoxic, allelopathic, ichtyotoxic or haemolytic effects upon marine organisms. The objective of this experimental study was to assess the effects of PST and BEC produced by A. minutum upon juvenile great scallops Pecten maximus. Scallops were exposed for one week to two different strains of A. minutum, the first producing both PST and BEC and the second producing only BEC. Escape response to starfish, daily shell growth,...
Tipo: Text Palavras-chave: Harmful Algal Bloom (HAB); Alexandrium minutum; Pecten maximus; Paralytic Shellfish Toxins (PST); Extracellular compounds; Behaviour; Histology.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00368/47878/47893.pdf
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Effects of hydrodynamic factors on Pecten maximus larval development ArchiMer
Holbach, Marine; Robert, Rene; Miner, Philippe; Mingant, Christian; Boudry, Pierre; Tremblay, Rejean.
Hatchery production of great scallop, Pecten maximus, remains unpredictable, notably due to poor larval survival. Large-scale flow-through systems up to 3500 L have been developed to avoid the use of antibiotics in static systems. Alternatively, small-scale flow-through systems have been successfully applied for oysters but they proved to be unsuitable to rear scallop larvae. By focusing on physical factors presumed to limit P. maximus larval development, this study aimed to optimize great scallop larvae rearing parameters under controlled conditions. First, the influence of aeration on larval performances, energetic metabolism and antioxidant defences were studied both in static and flow-through systems. Aeration depressed larval food intake, regardless...
Tipo: Text Palavras-chave: Aeration; Flow-through; Larval physiology; Pecten maximus.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00384/49508/51151.pdf
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Etudes sur les mortalites larvaires de la coquille st Jacques Pecten maximus en ecloserie ArchiMer
Robert, Rene; Miner, Philippe; Nicolas, Jean-louis; Mazuret, Michel; Connan, Jean-paul.
Larval mortalities occurring in molluscan hatcheries have often been associated with bacterial contamination. Although batches of oyster and clam larvae have been routinely reared in the hatchery of Argenton without antibiotics, high larval mortalities have been recorded with Pecten maxirnus under similar conditions. For this species, an addition of chloramphenicol was found necessary. However, this chemical has now been banned in Europe. Thus either substitition products or an improvement in the rearing procedures is essential. Studies carried out have shown that neither a decrease in larval density (1 larvae. ml"l) nor sea water change frequency (1 per day) had any positive effects. Furthermore, elective substances such as sugars were not suitable and...
Tipo: Text Palavras-chave: Mortality; Pecten maximus; Hatchery; Larvae; Mollusc; Mortalité; Pecten maximus; Ecloserie; Larve; Mollusque.
Ano: 1995 URL: https://archimer.ifremer.fr/doc/1995/rapport-1568.pdf
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Exposure to the toxic dinoflagellate Alexandrium catenella modulates juvenile oyster Crassostrea gigas hemocyte variables subjected to different biotic conditions ArchiMer
Lassudrie, Malwenn; Soudant, Philippe; Nicolas, Jean-louis; Miner, Philippe; Le Grand, Jacqueline; Lambert, Christophe; Le Goic, Nelly; Hegaret, Helene; Fabioux, Caroline.
The Pacific oyster Crassostrea gigas is an important commercial species cultured throughout the world. Oyster production practices often include transfers of animals into new environments that can be stressful, especially at young ages. This study was undertaken to determine if a toxic Alexandrium bloom, occurring repeatedly in French oyster beds, could modulate juvenile oyster cellular immune responses (i.e. hemocyte variables). We simulated planting on commercial beds by conducting a cohabitation exposure of juvenile, “specific pathogen-free” (SPF) oysters (naïve from the environment) with previously field-exposed oysters to induce interactions with new microorganisms. Indeed, toxic Alexandrium spp. exposures have been reported to modulate bivalve...
Tipo: Text Palavras-chave: Crassostrea gigas; Alexandrium; Harmful algal blooms; Hemocyte; Microbial challenge.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00314/42523/41894.pdf
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Impact of the toxic dinoflagellate Alexandrium catenella on Pacific oyster reproductive output: application of flow cytometry assays on spermatozoa ArchiMer
Le Goic, Nelly; Hegaret, Helene; Fabioux, Caroline; Miner, Philippe; Suquet, Marc; Lambert, Christophe; Soudant, Philippe.
The toxic dinoflagellate Alexandrium catenella recurrently blooms on the coasts of France and produces Paralytic Shellfish Toxins (PSTs) that accumulate in bivalves. These toxins can affect various physiological functions including reproduction. The present study aims to validate measurements of sperm viability, DNA content and mitochondrial membrane potential in Pacific oyster Crassostrea gigas using flow cytometry coupled with fluorescent markers, and to use these measurements to assess the cellular parameters of sperm from Pacific oysters exposed to A. catenella. These parameters may influence fertilization, embryogenesis and larval development in free-spawning shellfish. Sperm viability and DNA content estimation were assessed using SYBR-14, which only...
Tipo: Text Palavras-chave: Harmful algal bloom; Sperm quality; Cellular parameters; Flow cytometry; Pacific oyster; Crassostrea gigas; Alexandrium catenella.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26853/24982.pdf
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Impacts of ocean acidification and warming stress on juvenile growth and metabolism in two populations of Pecten maximus ArchiMer
Harney, Ewan; Rastrick, Samuel; Artigaud, Sébastien; Pisapia, Julia; Miner, Philippe; Pichereau, Vianney; Strand, Oivind; Boudry, Pierre; Charrier, Gregory.
Elevated atmospheric CO2 is a major driver of global change in the ocean, causing sea surface temperatures to rise and acidification of marine environments. Together these stressors may have additive, synergistic or unforeseen consequences for many marine organisms, particularly during early life stages. The economically important King Scallop (Pecten maximus) is found along a large latitudinal gradient in the Eastern Atlantic, but it is unclear how this species will respond to changing environmental conditions. Studies of genetic structure suggest that Atlantic populations (from Spain to the UK) are genetically distinct from Norwegian populations, a result that is borne out by phenotypic differences. Yet whether genetic differences arise as a result of...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00404/51520/52114.pdf
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Integrative Study of Physiological Changes Associated with Bacterial Infection in Pacific Oyster Larvae ArchiMer
Genard, Bertrand; Miner, Philippe; Nicolas, Jean-louis; Moraga, Dario; Boudry, Pierre; Pernet, Fabrice; Tremblay, Rejean.
Background: Bacterial infections are common in bivalve larvae and can lead to significant mortality, notably in hatcheries. Numerous studies have identified the pathogenic bacteria involved in such mortalities, but physiological changes associated with pathogen exposure at larval stage are still poorly understood. In the present study, we used an integrative approach including physiological, enzymatic, biochemical, and molecular analyses to investigate changes in energy metabolism, lipid remodelling, cellular stress, and immune status of Crassostrea gigas larvae subjected to experimental infection with the pathogenic bacteria Vibrio coralliilyticus. Findings: Our results showed that V. coralliilyticus exposure induced (1) limited but significant increase...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00144/25504/23662.pdf
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Interaction between toxic dinoflagellate Alexandrium catenella exposure and disease associated with herpesvirus OsHV-1μVar in Pacific oyster spat Crassostrea gigas ArchiMer
Lassudrie, Malwenn; Soudant, Philippe; Nicolas, Jean-louis; Fabioux, Caroline; Lambert, Christophe; Miner, Philippe; Le Grand, Jacqueline; Petton, Bruno; Hegaret, Helene.
Blooms of toxic dinoflagellates can co-occur with mass mortality events associated with herpesvirus OsHV-1 μVar infection that have been decimating Pacific oyster Crassostrea gigas spat and juveniles every summer since 2008 in France. This study investigated the possible effect of a harmful dinoflagellate, Alexandrium catenella, a producer of Paralytic Shellfish Toxins (PSTs), upon the oyster spat–herpesvirus interaction. Oyster spat from a hatchery were challenged by cohabitation with oysters contaminated in the field with OsHV-1 μVar and possibly other pathogens. Simultaneously, the oysters were exposed to cultured A. catenella. Infection with OsHV-1 μVar and PST accumulation were measured after 4 days of experimental exposure. Exposure to Alexandrium...
Tipo: Text Palavras-chave: Crassostrea gigas; OsHV-1 mu Var; Harmful algal blooms; Alexandrium; Host-pathogen interaction; PST accumulation.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00269/38000/36101.pdf
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La production aquacole de coquille Saint-Jacques (Pecten maximus) et le soutien scientifique à l'operation pilote ArchiMer
Dao, Jean-claude; Barret, Jean; Carval, Jean-pierre; Connan, Jean-paul; Corre, Christian; Devauchelle, Nicole; Fleury, Pierre-gildas; Laurent, Pascale; Mazuret, Michel; Miner, Philippe; Mingant, Christian; Muzellec, Marie-louise; Robert, Rene.
Aquaculture production of scallop has been identified by a series of technical operations during the past ten years programme under a partnership involving the fishermen organizations with regional and national grants. 3 million juveniles have been produced annually, giving a potential recapture by fishing of 100 to 120 tonnes 3 years later. Results in terms of technical and economical approach have pointed out the principal unknown factors responsable for high costs. 7he pilot programme aims to increase the production to reach a level of 5 million juveniles to support the fishery of the rade de Brest and induce new management of the resources. Two priorities were selected, control of the reproduction in the hatchery to obtain reliable larval and...
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Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15494/12860.pdf
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Lipid requirements of the scallop Pecten maximus (L.) during larval and post-larval development in relation to addition of Rhodomonas sauna in diet ArchiMer
Gagne, Renee; Tremblay, Rejean; Pernet, Fabrice; Miner, Philippe; Samain, Jean-francois; Olivier, Frederic.
The main objective of this study was to evaluate the effect of the addition of Rhodomonas salina in the diet of Pecten maximus on growth, survival and metamorphosis success in relation to biochemical content. Food quality is an essential factor in the success of larval, post-larval and juvenile development. A diet rich in polyunsaturated fatty acids present an advantage for growth, survival and metamorphosis success. Larvae and post-larvae fed with the diet containing R. sauna showed a higher accumulation of arachidonic acid (20:4n-6) and generally a lower concentration of docosahexaenoic acid (22:6n-3). Addition of R. sauna in diet was related with higher level of eicosapentaenoic acid (20:5n-3) in larval stages, but lower level in post-larvae. Addition...
Tipo: Text Palavras-chave: Nutrition; Biochemical characteristics; Fatty acids; Sterol profiles.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13045/10205.pdf
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Long dsRNAs promote an anti-viral response in Pacific oyster hampering ostreid herpesvirus 1 replication ArchiMer
Pauletto, Marianna; Segarra, Amelie; Montagnani, Caroline; Quillien, Virgile; Faury, Nicole; Le Grand, Jacqueline; Miner, Philippe; Petton, Bruno; Labreuche, Yannick; Fleury, Elodie; Fabioux, Caroline; Bargelloni, Luca; Renault, Tristan; Huvet, Arnaud.
Double-stranded RNA (dsRNA)-mediated genetic interference (RNAi) is a widely used reverse genetic tool for determining the loss-of-function phenotype of a gene. Here, the possible induction of an immune response by long dsRNA was tested in a marine bivalve (Crassostrea gigas), as well as the specific role of the subunit 2 of the nuclear factor kappa B inhibitor (I kappa B2). This gene is a candidate of particular interest for functional investigations in the context of oyster mass mortality events, as Cg-I kappa B2 mRNA levels exhibited significant variation depending on the amount of ostreid herpesvirus 1 (OsHV-1) DNA detected. In the present study, dsRNAs targeting Cg-I kappa B2 and green fluorescent protein genes were injected in vivo into oysters...
Tipo: Text Palavras-chave: Anti-viral response; RNA interference; Inhibitor of NF-kappa B; Marine bivalve; Ostreid herpesvirus 1.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00409/52011/52698.pdf
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Non-additive effects of ocean acidification in combination with warming on the larval proteome of the Pacific oyster, Crassostrea gigas ArchiMer
Harney, Ewan; Artigaud, Sebastien; Le Souchu, Pierrick; Miner, Philippe; Corporeau, Charlotte; Essid, Hafida; Pichereau, Vianney; Nunes, Flavia.
Increasing atmospheric carbon dioxide results in ocean acidification and warming, significantly impacting marine invertebrate larvae development. We investigated how ocean acidification in combination with warming affected D-veliger larvae of the Pacific oyster Crassostrea gigas. Larvae were reared for 40 h under either control (pH 8.1, 20 °C), acidified (pH 7.9, 20 °C), warm (pH 8.1, 22 °C) or warm acidified (pH 7.9, 20 °C) conditions. Larvae in acidified conditions were significantly smaller than in the control, but warm acidified conditions mitigated negative effects on size, and increased calcification. A proteomic approach employing two-dimensional electrophoresis (2-DE) was used to quantify proteins and relate their abundance to phenotypic traits. In...
Tipo: Text Palavras-chave: Crassostrea gigas; Ocean acidification; Larval development; ATP synthase; GAPDH; Superoxide dismutase.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00299/40985/40076.pdf
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