Collection of Drosophila flies in Reunion, Mauritius and Seychelles for the study of heteroplasmy and introgression of mitochondria

我们收集果蝇在三个印度洋岛屿，留尼汪岛，毛里求斯和塞舌尔在1987年6月。这些岛屿的物种组成见表。与Tsacas（1981）的最新数据相比，毛里求斯的动物群发生了很大变化。另一个新发现是在所有三个岛上都能发现黑腹果蝇。我们正在检查留尼汪岛新获得的模拟果蝇的线粒体DNA的物理图谱，尽管到目前为止对大约100个同雌系进行了测试，没有观察到异质性。一系列的实验表明，两种类型的mtDNA，S和M，可能存在古老的多态性。M在D. mauritiana中很常见。利用这些新材料，我们构建了一个基于种间mtDNA序列比较的黑腹果蝇亚群的进化树。

We collected Drosophila flies in three Indian Ocean islands, Reunion,Mauritius and Seychelles in June 1987. Species constitution in these islands is shown in the table. Fauna in Mauritius has largely changed, compared with the most reoent data by Tsacas (1981). Another new finding is that D.melanogaster can be found in all three islands.We are examining physical maps of mt DNA of newly obtained flies of D.simulans from Reunion, although no heteroplasmy has been observed so far as about 100 isofemale lines were tested. A series of experiments indicate the possibility of old polymorphism with respect to two types of mt DNA, S and M. M is now common in D.mauritiana. Using the new materials we have constructed a phylogeny tree of D.melanogaster subgroup based interspecific mt DNA sequenoe comparisons.