Genetic variation among populations ofMytilusspp. in eastern Newfoundland

✍ Scribed by J. A. Bates; D. J. Innes

• Book ID: 104740807
• Publisher: Springer-Verlag
• Year: 1995
• Tongue: English
• Weight: 700 KB
• Volume: 124
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00363915

✦ Synopsis

Limited sampling of Mytilus spp. in eastern Newfoundland has suggested that M. trossulus Gould and M. edulis L. are distributed as pure populations or mixtures of both species. In 1989 and 1990 we collected a wider series of samples of Mytilus spp. from 16 sites in eastern Newfoundland in order to determine the genetic structure based on four polymorphic enzyme loci (Est, Pgm, Lap, Ap). Associations among loci (particularly Pore and Est), and a bimodal distribution of individual principal-component scores (based on fourlocus genotypes) provided evidence for the presence of both M. trossulus and M. eduIis. Most of the sites consisted of a mixture of the two species. The relative frequency of each species in the samples varied on both a macro-and microgeographic scale. Two waveexposed sites had the highest frequency ( > 90%) of M.

trossulus. The distribution of hybrid index scores, based on three partially diagnostic loci (Est, Pgm, Lap), provided no evidence for hybridization.