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Direct Observation of Sexual Isolation between Allopatric and between Sympatric Strains of the Different Drosophila paulistorum Races
Vol. 19, No. 4 (Dec., 1965), pp. 459-464
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2406243
Page Count: 6
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Those races of the Drosophila paulistorum species-complex of six known races which occur sympatrically and retain their separate identities in nature, exhibit a greater sexual isolation than do strains of the same races which occur allopatrically. This behavioral isolation was tested by a recently developed direct observation technique and bespeaks the correctness of considering these races as incipient species.
Evolution © 1965 Society for the Study of Evolution