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Genetic variation in natural populations of Drosophila obscura.

HE geographic distribution area of Drosophila obscura Fallkn extends from Tsouthern Europe to central Finland and Sweden; it also has another area of occurrence, isolated by at least 500 kilometers from the former in northern Lapland and on the northwestern coast of Norway. This latter area coincides with that of the northern unicentric species group that is assumed to have survived the Pleistocene glaciation on the northwestern coast of Norway and on the adjacent islands. This study describes enzyme polymorphism of D. obscura in northernmost Europe. We have studied genetic variation in 33 loci in material collected from natural populations of the species in Finland and northern Sweden and Norway.