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| Pernet, Fabrice; Tamayo, David; Fuhrmann, Marine; Petton, Bruno. |
| Food provisioning influences disease risk and outcome in animal populations in two ways. On the one hand, unrestricted food supply improves the physiological condition of the host and lowers its susceptibility to infectious disease, reflecting a trade-off between immunity and other fitness-related functions. On the other hand, food scarcity limits the resources available to the pathogen and slows the growth and metabolism of the host on which the pathogen depends to proliferate. Here, we investigated how food availability, growth rate and energetic reserves drive the outcome of a viral disease affecting an ecologically relevant model host, the Pacific oyster, Crassostrea gigas. We selected fast- and slow-growing animals, and we exposed them to high and low... |
| Tipo: Text |
Palavras-chave: Energetics; Health; Herpesvirus; Nutrition; Physiological trade-off. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62431/66716.pdf |
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| Pernet, Fabrice; Tamayo, David; Petton, Bruno. |
| Mortalities of oyster seed of Crassostrea gigas associated with ostreid herpes virus OsHV-1 μVar have been observed in many oyster producing countries since 2008. The objective of this study was to further investigate whether low temperature treatments can offer a viable option to mitigate oyster mortalities. An experiment was set-up to further evaluate the effect of low temperature treatments (10 and 13°C vs. 21°C) and their duration (6 d to 83 d) on the survival of oysters previously infected with OsHV-1 μVar by means of exposure to field conditions in areas where mortalities were occurring. Average survival of oysters infected with OsHV-1μVar was 71% after 83 d at low temperatures compared to only 23% in controls maintained at 21°C. During... |
| Tipo: Text |
Palavras-chave: Bivalve; Disease; OsHV-1; Oyster; Temperature; Virus. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00259/37047/35555.pdf |
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| Tamayo, David; Ibarrola, Irrintzi; Urrutxurtu, Inaki; Navarro, Enrique. |
| Juvenile oysters (Crassostrea gigas) (produced in November 2009) reared under uniform hatchery conditions for 4 months were selected for extreme growth rate differences by repeatedly taking larger and smaller individuals to achieve weight differences > 30x between fast (F) and slow (S) growers. The physiological basis of differential growth was analyzed in experiments in June 2010, where components of energy gain (clearance and ingestion rates and absorption efficiency), energy loss (metabolic rates) and resulting scope for growth (J h(-1)) were compared for groups of F and S oysters fed three different ration levels (a parts per thousand 0.5, 1.5 and 3.0 mg of total particulate matter L-1). In both F and S oysters, a higher food ration promoted... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00201/31244/29909.pdf |
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| Corporeau, Charlotte; Tamayo, David; Pernet, Fabrice; Quere, Claudie; Madec, Stephanie. |
| Pacific oyster Crassostrea gigas were inoculated with OsHV-1 at low load (control) or high load (challenged) to better understand the pathogenesis of ostreid herpesvirus 1 (OsHV-1 μVar) and to determine which metabolic pathways might be affected during infection. Animals were sampled for proteomic analysis two days post-injection, at the same time as OsHV-1 initiated an intense replication phase in challenged oysters. Twenty-five abundant protein spots that showed a marked change in accumulated levels were identified using a two-dimensional electrophoresis (2-DE) proteomic approach. Overall, these proteins are involved in cytoskeleton organization, protein turnover, induction of stress signals, signalling pathways and energy metabolism. Challenged oysters... |
| Tipo: Text |
Palavras-chave: Marine bivalves; Crassostrea gigas; Herpesvirus; Metabolism; Warburg. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00199/31035/29439.pdf |
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