SHELL AND PEARL CHROMATIC VARIATION IN PINCTADA MARGARITIFERA AMONG CORAL REEF ENVIRONMENTS IN FRENCH POLYNESIA
The black-lipped pearl oyster Pinctada margaritifera inhabits subtropical and tropical coral reefs, and is particularly abundant in the lagoons of French Polynesia. Its aquaculture is developed in lagoons of 25 atolls and islands widely geographically spread over 14° longitude and therefore subject to disparate environmental regimes. This species exhibits a remarkable wide range of colors of the shell and cultured pearls. The factors that contribute to the color determination include the oyster phenotype (genetic), the culture zone (environment) and their interactions. To understand the origin of the phenotypic color variations, several approaches have been approached, both at a genetic and a macro-environmental level. Specific crosses are set up to show the clear pattern of phenotypic inheritance of flesh and shell color mutation consistent with Mendelian inheritance and expression of a single-locus, dominant trait. Relations to environmental variation were studied using first generation P. margaritifera families, produced through hatchery system, to test in field for their potential. For pearl color, classification tree model could be built to predict, according to shell phenotype and culture location, the color and darkness level of harvested pearls. Lustre was shown to be more influenced by the environment than by phenotype. All these preliminary results have implications for a better understanding of P. margaritifera adaptation to the environment, associated with its phenotypic plasticity.
KY, C. L., Ifremer, French Polynesia, firstname.lastname@example.org
LO, C., Drmm, French Polynesia, email@example.com
PLANES, S., Cnrs, France, firstname.lastname@example.org
Location: 313 B
Presentation is given by student: Yes