Genetic differenciation in Japanese populations of Drosophila simulans and D. melanogaster. I. Allozyme polymorphisms.

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Abstract
Enzyme polymorphisms at 10 loci were studied both for D, simulans from the Japanese main island populations and Ogasawara population (the former has recently colonized and the latter has long been established) and for D. melanogaster from the main island and southern island populations including Ogasawara and Ryukyu Islands (these have been established). The proportion of polymorphic loci of D. simulans (32%) was lower than that of D. melanogaster (68%). However, a remarkable similarity in the average heterozygosities was found between D. simulans (H=0.154) and D. melanogaster (H=0.156). Differences in allele frequencies between years were small in both species. Among the 16 main island populations of D. simulans from Sapporo to Kagoshima, geographical uniformity of allozyme polymorphisms was found, but allele frequencies in the Ogasawara population were quite distinct from those of the main island populations. On the other hand, apparent geographical differentiation was found in D. melanogaster even among the 14 main island populations, as well as between the main island and Ogasawara populations.