Data/hora: 09/06/2024 04:00:45

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Impact génétique de la production intensive d'huîtres en écloserie : processus de dérive et de sélection liés aux pratiques d'élevage larvaire
Autores: | Taris, Nicolas; Sauvage, Christopher; Boudry, Pierre.
Data: | 2004-08-24
Ano: | 2004
Palavras-chave: | Crassostrea gigas; Huîtres; Marqueurs microsatellites; Reproduction; Sélection; Dérive génétique; Variabilité génétique; Génétique.
Resumo: | 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 controlled crossbreeding in order (1) to quantify the impact of the larviculture practices on the effective population size, (2) to describe the temporal structuration of the larval population through its development (and thus to try and estimate the potential loss caused by the culling of small larvae) and (3) to look for possible genotype x environment interactions. The first results show a diversity loss linked to larviculture practices, as well as a differential temporal structuration of the larval population, confirming the existence of a genetic variability for the characters related to precocious development in this species.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/2004/acte-3481.pdf
Editor: | XXIIème Réunion Annuelle du Groupe de Biologie et Génétique des Population, Petit Pois Déridé
Relação: | http://archimer.ifremer.fr/doc/00000/3481/
Formato: | application/pdf