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Registros recuperados: 6
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Ecologie du copépode calanoïde Paracartia grani. Implication dans le cycle de vie du parasite Marteilia refringens dans la lagune de Thau ArchiMer
Boyer, Séverine.
In this study, the life cycle of Paracartia grani, a calalloid copepod belonging to the Acartiidae family was determined in Thau lagoon. Indeed, the copepod involvement in the life cycle of the parasite Marteilia refringens affecting the bivalve productions is suspected. Mesozooplanktonic community .was monitored twice a month. over two years at a fixed station in the lagoon. Sampling has identified P. grani as the acartiid dominant species in summer. From April to January, the copepod is found in the water column while from February to early April it remains in the sediment as diapausing eggs. The analysis of the population structure (size spectmm, contribution of developmental stages and sex ratio) has revealed that there are in between 6 and 9...
Tipo: Text Palavras-chave: Paracartia grani; Cycle de vie; Production d'oeufs; Oeufs de diapause; Mésozooplancton; Marteilia refringens; Mytilus galloprovincialisa; Ruditapes decussatus; PCR; Hybridation in situ; Lagune de Thau; Paracartia grani; Life cycle; Egg production; Diapause eggs; Mesozooplankton; Marteilia refringens; Mytilus galloprovincialis; Ruditapes decussatus; PCR; In situ hybridization; Thau lagoon.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00118/22931/21482.pdf
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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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Needle in a haystack: involvement of the copepod Paracartia grani, in the life-cycle of the oyster pathogen Marteilia refringens ArchiMer
Audemard, Corinne; Le Roux, Frédérique; Barnaud, Antoine; Collins, Catherine; Sautour, B; Sauriau, Pierre-guy; De Montaudouin, X; Coustau, C; Combes, C; Berthe, Franck.
Marteilia refringens is a major pathogen of the European flat oyster, Ostrea edulis Linnaeus. Since its description, the lifecycle of this protozoan parasite has eluded discovery. Attempts to infect oysters experimentally have been unsuccessful and led to the hypothesis of a complex life-cycle involving several hosts. Knowledge of this life-cycle is of central importance in order to manage oyster disease. However, the exploration of M. refringens life-cycle has been previously limited by the detection tools available and the tremendous number of species to be screened in enzootic areas. In this study, these two restrictions were circumvented by the use of both molecular detection tools and a mesocosm with low biodiversity. Screening of the entire fauna of...
Tipo: Text Palavras-chave: Experimental transmission; In situ hybridization; PCR; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-2778.pdf
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New evidence for the involvement of Paracartia grani (Copepoda, Calanoida) in the life cycle of Marteilia refringens (Paramyxea) ArchiMer
Boyer, S.; Chollet, Bruno; Bonnet, D.; Arzul, Isabelle.
The dynamics of the protozoan parasite Marteilia refringens was studied in Thau lagoon, an important French shellfish site, for 1 year in three potential hosts: the Mediterranean mussel Mytilus galloprovincialis (Mytiliidae) the grooved carpet shell Ruditapes decussatus (Veneriidae) and the copepod Paracartia grani (Acartiidae). Parasite DNA was detected by PCR in R. decussatus. In situ hybridisation showed necrotic cells of M. refringens in the digestive epithelia of some R. decussatus suggesting the non-involvement of this species in the parasite life cycle. In contrast, the detection of M. refringens in mussels using PCR appeared bimodal with two peaks in spring and autumn. Histological observations of PCR-positive mussels revealed the presence of...
Tipo: Text Palavras-chave: Marteiliosis; Marteilia refringens; Parasite life cycle; Mytilus galloprovincialis; Ruditapes decussatus; Paracartia grani; PCR; In situ hybridisation.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26795/25532.pdf
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Some like it hot: Paracartia grani (Copepoda: Calanoida) arrival in the Thau lagoon (south of France—Mediterranean Sea) ArchiMer
Boyer, Séverine; Arzul, Isabelle; Bonnet, Delphine.
Paracartia grani originates from high latitudes and has progressively been recorded in the Mediterranean Sea since the 1980s. In Thau lagoon, while Acartia clausi and Acartia discaudata present maximum peaks of abundance from January to April and in November and December, both species being perennial over the year, P. grani and Paracartia latisetosa appear in May, develop during summer, in July and August, and slowly decrease in autumn before disappearing from the water column in December. The Acartiidae populations have changed over the years at our monitoring station. Indeed, P. latisetosa was last recorded in August 1983 while P. grani appeared in the lagoon in 1998.
Tipo: Text Palavras-chave: Paracartia grani; Mediterranean Sea; Long term changes; Acartia spp.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00092/20354/18007.pdf
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Stratégie d'utilisation de différentes espèces animales par le parasite Marteilia refringens pour assurer son cycle biologique ArchiMer
Audemard, Corinne.
Au cours des trente dernières années, la production française d 'huître plate Ostrea edulis est passée de 30 000 tonnes par an à seulement 1 500 tonnes actuellement. Le parasite de la glande digestive de l'huître plate, Marteilia refringens, est en partie responsable de cette chute de production. La gestion des risques liés au développement de cette maladie en zone endémique, nécessite la mise en évidence des compartiments fonctionnels de ce cycle parasitaire. Les travaux antérieurs ont montré que le cycle de M. refringens était vraisemblablement hétéroxène, cependant cette hypothèse n'avait jamais pu être démontrée, limitant cette gestion. La recherche d'hôtes de M. refringens a pu être réalisée par l'application d'outils de biologie moléculaire (PCR et...
Tipo: Text Palavras-chave: Pathologie des mollusques; Marteilia refringens; Ostrea edulis; Paracartia grani; Cycle de vie; Outils de biologie moléculaire; Modèle d'étude.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00107/21850/19440.pdf
Registros recuperados: 6
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