Data/hora: 06/06/2024 06:06:18

Provedor de dados: 	5	
País: 	France	
Título: 	Etude des processus de dérive et de sélection liés aux pratiques d'élevage en écloserie d'huître creuse	
Autores: 	Boudry, Pierre.	
Data: 	2006-02	
Ano: 	2006	
Palavras-chave: 	Hatchery; Genetic diversity; Selection domestication; Larvae; Crassostrea gigas; Ecloserie; Diversité génétique; Sélection domestication; Larve; Crassostrea gigas.	
Resumo: 	Genetic consequences of production of Pacific oyster larval in hatchery: drift and selective pressures related to rearing practices. In order to study the genetic consequences of production of oyster larvae in hatcheries, two factors were examined: the effects of discarding the smallest larvae (i.e. culling) and temperature effects. A mixed-family approach was used in order to infer the genetic composition of the larval population. The results show that high polymorphic microsatellite-based family assignment is a powerful tool for the study of bivalve larvae genetics. Culling by selective sieving is an advantageous practice at a phenotypic scale, but also represents a substantial risk for diversity loss if parentage assignment is not introduced as a breeding practice. Settlement of slow growing larvae contributes to minimizing the variability of reproductive success and therefore to maximizing genetic diversity. These results corroborate the lower estimations of variability made on broodstocks from French commercial hatcheries relative to natural populations. Temperature exerts an influence on the expression of genetic variability for larval growth. A temperature of 26°C, coupled with culling could amplify the selective effect. Furthermore, selection of fast growing larvae has proven to counteract inbreeding depression at this stage. Genetic effects of intensive rearing conditions are significant and should be taken into account in hatchery practices, especially in terms of genetic diversity management.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/2006/rapport-1459.pdf	
Relação: 	http://archimer.ifremer.fr/doc/00000/1459/	
Formato: 	application/pdf