Figure 3

Projection of samples centers of gravity on the first factorial plane of a correspondence analysis (CA) on the matrix of allele frequencies at three loci ( EFbis , Glu-5' and mac-1 ). The four samples representative of each species patch used for the analysis of DNA sequences are indicated by white and black stars for M. edulis and M. galloprovincialis respectively. The eleven samples previously analyzed [33] are indicated by white and black dots for M. edulis and M. galloprovincialis respectively. Ellipses group samples for which the homogeneity of allelic frequencies could not be rejected at the EFbis locus.