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Mytilus edulis L. and M. galloprovincialis Lmk. are two forms of mussels that live and are cultivated on the Northeastern Atlantic coasts and where they coexist they hybridise in varying proportions. Up to date, the form or forms of Mytilus that inhabit the Atlantic coast of northern Africa have not been reliably determined. Four partially diagnostic allozyme loci for M. edulis and M. galloprovincialis (esterase-D, leucine aminopeptidase-1, mannose phosphate isomerase and octopine dehydrogenase) were investigated in mussel samples from five northern African sites in the Atlantic Ocean and the Alboran Sea. Pure European M. galloprovincialis and M. edulis samples were also studied for comparison. Evidence from diagnostic enzyme loci indicates that M. galloprovincialis occurs on the Atlantic and SW Mediterranean coasts of northern Africa, and no evidence for the occurrence of M. edulis, or hybrids between M. edulis and M. galloprovincialis, has been found in this area. The results are discussed in relation to the geographical distribution of both forms of Mytilus on Northeastern Atlantic coasts. |
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