Publication

2004-11

English

http://archimer.ifremer.fr/doc/2004/publication-680.pdf (0.16 Mo)

2004 The American Genetic Association

Diaz Almela F, Boudry Pierre, Launey Sophie, Bonhomme Francois, Lapegue Sylvie

IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France.
Univ Montpellier 2, CNRS, IFREMER, SMEL, F-34200 Sete, France.

Journal of Heredity (0022-1503) (Oxford University Press), 2004-11 , Vol. 95 , N. 6 , P. 510-516

18

Biology, Aquaculture

Ostrea edulis, Polymorphism, Flat oyster, Population, Gene

The geographical structure of 15 natural populations of the flat oyster (Ostrea edulis L.) was assessed by single-strand conformation polymorphism (SSCP) of a 313-base-pair (bp) fragment of the mitochondrial 12S-rRNA gene. Fourteen haplotypes were observed, with one being dominant in the Mediterranean samples and another one in the Atlantic populations. The geographically extreme populations sampled in Norway and the Black Sea appeared differentiated by exhibiting the dominance of a third group of haplotypes. The results were compared to available microsatellite data at five loci. The Atlantic/Mediterranean differentiation pattern was qualitatively the same with both types of markers, confirming an isolation-by-distance pattern. The average mitochondrial haplotypic diversity displayed a high among populations variance, reflecting small effective population size in some locations. Additionally, a 10-fold quantitative difference was observed in Fst between the mitochondrial and the nuclear genomes, which could be due to an unbalanced sex ratio or sex-biased differential reproductive success between males and females (or both).