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The Reproductive Relationships of Drosophila sechellia with D. mauritiana, D. simulans, and D. melanogaster from the Afrotropical Region

Daniel Lachaise, Jean R. David, Francoise Lemeunier, Leonidas Tsacas and Michael Ashburner
Evolution
Vol. 40, No. 2 (Mar., 1986), pp. 262-271
DOI: 10.2307/2408806
Stable URL: http://www.jstor.org/stable/2408806
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Reproductive Relationships of Drosophila sechellia with D. mauritiana, D. simulans, and D. melanogaster from the Afrotropical Region
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Abstract

Hybridization tests among the four sibling species of the Drosophila melanogaster complex were made to determine the reproductive status of the recently discovered D. sechellia (which is endemic to a few islands and islets of the Seychelles archipelago) with regard to its three close relatives, D. mauritiana (endemic to Mauritius) and Afrotropical strains of the two cosmopolitan species D. melanogaster and D. simulans. Interstrain variation in the ability to hybridize with other species was also analyzed for D. melanogaster and D. simulans. D. mauritiana and D. simulans appear to be more weakly isolated from each other than either species is from D. sechellia. A striking unilateral mating success is observed in the cross of D. sechellia with D. simulans. The most extreme isolation is between D. melanogaster and its three siblings. Variation in the ability of strains to hybridize is observed in heterospecific crosses between D. simulans and either D. melanogaster or D. mauritiana.

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