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We summarize data showing that there is population structure in African populations of Drosophila from the melanogaster-simulans complex. In D. melanogaster, population structuring is found at individual loci, but is obscured by population structuring for large inversions that simultaneously affect several loci. In D. simulans, molecular polymorphism at the(More)
A natural population of Drosophila melanogaster was sampled twice over a 5-year interval from the same French locality in the same season. Reaction norms of wing and thorax length and wing/thorax ratio, according to growth temperature (12-31 °C) were analysed in ten isofemale lines for each sample. Reaction norms were very similar between years, showing not(More)
The breeding structure of populations has been neglected in studies of Drosophila, even though Wright and Dobzhansky's pioneering work on the genetics of natural populations was an attempt to tackle what they regarded as an essential factor in evolution. We compared the breeding structure of sympatric populations of D. melanogaster and D. simulans, two(More)
We carried out experiments with the Drosophila C virus (DCV), a nonhereditary virus acting on demographic parameters of infected Drosophila host populations. It is well known that DCV increases mortality rate, decreases developmental time, and increases daily fecundity. As usual for Drosophila viruses, the DCV was multiplied in vivo. In this study we tested(More)
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