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Provedor de dados:  ArchiMer
País:  France
Título:  Interaction between toxic dinoflagellate Alexandrium catenella exposure and disease associated with herpesvirus OsHV-1μVar in Pacific oyster spat Crassostrea gigas
Autores:  Lassudrie, Malwenn
Soudant, Philippe
Nicolas, Jean-louis
Fabioux, Caroline
Lambert, Christophe
Miner, Philippe
Le Grand, Jacqueline
Petton, Bruno
Hegaret, Helene
Data:  2015-05
Ano:  2015
Palavras-chave:  Crassostrea gigas
OsHV-1 mu Var
Harmful algal blooms
Host-pathogen interaction
PST accumulation
Resumo:  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 catenella modified the host–pathogen interaction by reducing prevalence of OsHV-1 μVar infection. In addition, oysters challenged with OsHV-1 μVar and possibly other pathogens from the environment accumulated smaller amounts of PSTs than unchallenged oysters. Three possible mechanisms are suggested by these results: (i) possible direct interactions between A. catenella and herpesvirus (or associated pathogens) could reduce viral transmission and algal availability for oyster consumption; (ii) oyster feeding behavior or digestive functions may have been altered, thus decreasing both uptake of viral particles and consumption or digestion of toxic algae and consequent toxin accumulation; (iii) immuno-activation by A. catenella could enhance defense efficiency against OsHV-1 μVar infection. These findings suggest further research on relationships between OsHV-1 μVar and toxic dinoflagellates and their combined effects upon disease transmission and proliferation processes, as well as on oyster physiological and immunological involvement in this complex, tripartite interaction.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier Science Bv
Formato:  application/pdf
Fonte:  Harmful Algae (1568-9883) (Elsevier Science Bv), 2015-05 , Vol. 45 , P. 53-61
Direitos:  2015 Elsevier B.V. All rights reserved.


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