Abstract
Blue mussels of the genus Mytilus (M. edulis Linnaeus 1758; M. galloprovincialis Lamarck 1819; M. trossulus Gould 1850) are widely distributed in Southern and Northern hemispheres. This ecological plasticity together with the existence of interspecific hybridization in overlapping regions (Skibinski et al. 1978) makes them an interesting model for studies of population dynamics in marine habitats. Genetic marker surveys on Mytilus spp. have shown the genetic uniqueness of each species (McDonald and Koehn 1988). Several molecular markers have been developed over the last three decades to describe genetic polymorphisms in mussels. However most of them have a number of disadvantages for use as population markers, relating to data interpretation, technical difficulties, genotype discrimination, and restricted amount of polymorphism (Ohresser et al. 1997). In order to analyze intraspecific phenomena related to both natural genetic substructuring and anthropogenic changes, it is useful to develop highly informative markers, such as microsatellites.
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