Ostras tropicales : cultivo y métodos

Versión en inglés disponible en la Biblioteca Digital del IDRC: Tropical oysters : culture and methodsVersión en francés disponible en la Biblioteca Digital del IDRC: Huîtres sous les tropiques : culture et méthode

Farming bivalve molluscs : methods for study and development

Published jointly with IDR

Huîtres sous les tropiques : culture et méthodes

Version anglaise disponible dans la Bibliothèque numérique du CRDI: Tropical oysters : culture and methodsVersion espagnole disponible dans la Bibliothèque numérique du CRDI: Ostras tropicales : cultivo y método

Tropical oysters : culture and methods

Library has French version: Huîtres sous les tropiques : culture et méthodesLibrary has Spanish version: Ostras tropicales : cultivo y método

Atelier du Pacifique Nord : évaluation et gestion des stocks d'invertébrés, 7-10 mai 1984

Parallel text in English and Frenc

Genetic polymorphism and trade-offs in the early life-history strategy of the Pacific oyster, Crassostrea gigas (Thunberg, 1795): A quantitative genetic study

We investigated genetic variability and genetic correlations in early life-history traits of Crassostrea gigas. Larval survival, larval development rate, size at settlement and metamorphosis success were found to be substantially heritable, whereas larval growth rate and juvenile traits were not. We identified a strong positive genetic correlation between larval development rate and size at settlement, and argue that selection could optimize both age and size at settlement. However, trade-offs, resulting in costs of metamorphosing early and large, were suggested by negative genetic correlations or covariances between larval development rate/size at settlement and both metamorphosis success and juvenile survival. Moreover, size advantage at settlement disappeared with time during the juvenile stage. Finally, we observed no genetic correlations between larval and juvenile stages, implying genetic independence of life-history traits between life-stages. We suggest two possible scenarios for the maintenance of genetic polymorphism in the early life-history strategy of C. gigas