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A Study of Sexual Isolation Between Certain Strains of Drosophila paulistorum

Ch. Malogolowkin-Cohen, A. Solima Simmons and H. Levene
Evolution
Vol. 19, No. 1 (Mar., 1965), pp. 95-103
DOI: 10.2307/2406298
Stable URL: http://www.jstor.org/stable/2406298
Page Count: 9
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A Study of Sexual Isolation Between Certain Strains of Drosophila paulistorum
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Abstract

Sexual isolation has been tested between strains of Drosophila paulistorum of the Andean-Brazilian race from Brazil on the one hand, and strains of various races from other localities on the other. The method of "male choice," putting females of two strains in a vial with males of one of the strains, and then dissecting the females to see if they were inseminated, and "multiple choice" experiments, using males and females of both strains, and observing mating in observation chambers of the kind designed by Ellens, were used. The two methods give comparable results. Females of the Amazonian, and also of the Orinocan race, mate less often than do the Andean-Brazilian females. Sexual isolation is very high between the AndeanBrazilian tester strains and the Amazonian race, and moderate with the Orinocan race. In both cases the isolation is lower for the Andean-Brazilian females than in the reverse direction. When hybrids are produced, the males are usually sterile. On the other hand, rather strong sexual isolation, not accompanied by sterility of the hybrids, is observed between strains of the Andean-Brazilian race from geographically very remote localities: Ceara, Bahia, and Rio de Janeiro on one side, and western and northern Colombia on the other.

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