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Impact génétique de la production intensive d'huîtres en écloserie : processus de dérive et de sélection liés aux pratiques d'élevage larvaire ArchiMer
Taris, Nicolas; Sauvage, Christopher; Boudry, Pierre.
Oysters, like many other marine bivalves, are characterized by high fertility and low survival rates during the precocious stages. Hatchery reproduction, realised in very different conditions than in their natural habitat (density, food, temperature, etc.), tends to optimize the production of larvae and juveniles. As a consequence, slow growing larvae are systematically culled. Previous results suggest the existence of a genetic variability linked to precocious development. Our approach consists in studying the evolutionary process (genetic drift and selection) linked with hatchery reproduction. Thanks to microsatellite markers enabling us to analyse the relatedness in "mixed" cultivated families, we studied the variability of breeding success in...
Tipo: Text Palavras-chave: Crassostrea gigas; Huîtres; Marqueurs microsatellites; Reproduction; Sélection; Dérive génétique; Variabilité génétique; Génétique.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-3481.pdf
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Changements adaptatifs induits par la pêche chez les populations halieutiques ArchiMer
Marty, Lise.
Fishing is an important source of mortality in harvested populations and therefore may induce adaptive responses. These responses affect life-history traits in particular, which have consequences for stocks’ dynamics, and thus can alter the demographic direct effect of fishing (i.e. the reduction in stock’s biomass). Fishing-induced adaptive changes depend, non-exclusively, on two processes: evolution and phenotypic plasticity. These two components are observed at the phenotypic level because functional genes coding for the traits undergoing adaptive changes have not yet been identified. These two origins are confounded in individual phenotypes, and the impact of adaptive changes in the long run remains therefore unclear: evolutionary changes are expected...
Tipo: Text Palavras-chave: : Pêche; Évolution adaptative; Plasticité phénotypique; Norme de réaction; Dérive génétique; Érosion génétique; Age et taille à maturation; Croissance; Survie; Trade-offs; Densité-dépendance; Gadidées de mer du nord; Fishing; Adaptive evolution; Phenotypic plasticity; Reaction norm; Genetic drift; Genetic erosion; Age and size at maturation; Growth; Survival; Trade-offs; Density-dependence; North sea Gadoids.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00079/19013/16591.pdf
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