Genetically based resistance to summer mortality in the Pacific oyster (Crassostrea gigas) and its relationship with physiological, immunological characteristics and infection processes
By J. Samain, L. Dégremont, P. Soletchnik, J. Haure, E. Bedier, M. Ropert, J. Moal, A. Huvet, Hélène Bacca, A. Wormhoudt and 14 more. 2007
201 citations recorded by the source corpus.
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 confirming the high heritability of survival of juveniles b1 year old. Interestingly, no correlation was observed between growth and survival. Comparison between the two selected groups showed that S oysters invested more energy in reproduction and stayed a longer time without spawning than R oysters which had high synchronous spawning. This was mainly shown with high rather than low dietary rations (respectively 12% and 4% DW algae/DW oyster) in a controlled experiment. Moreover, early partial spawning was detected in S oysters and not R ones in the high dietary ration. S showed a higher respiration rate and an earlier decrease in absorption efficiency than R during gametogenesis, but they were not significantly different in glycogen or ATP utilisation. Two months before a mortality episode, hemocytes from S oysters had a higher adhesive capacity than R hemocytes and significantly higher reactive oxygen species production capacity. One month before mortality, S oysters had the highest hyalinocyte
Subfields: Aquatic Science, Global and Planetary Change, Oceanography
View Paper: https://www.semanticscholar.org/paper/01b5783780daf2f7f82fc0adaf36a9aea45f4151
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Global and Planetary Change
In Oceanography
Citations in the corpus
- Metabolic adjustments in the oyster Crassostrea gigas according to oxygen level and temperature (2007, background): “With high PcO2 values, the metabolic depression occurred quickly, showing that oysters had a low capacity to regulate their respiration when oxygen availability is reduced, particularly in the summer.”
- Influence of temperature and spawning effort on Haliotis tuberculata mortalities caused by Vibrio harveyi: an example of emerging vibriosis linked to global warming (2009, background): “Spawning effort has also been well-documented as a key factor in summer mortality of C. gigas (Pouvreau et al., 2003; Delaporte et al., 2007; Royer et al., 2007; Samain et al., 2007).”