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Sexual Isolation and Variation in Mating Behavior within Drosophila athabasca

Dwight D. Miller
Evolution
Vol. 12, No. 1 (Mar., 1958), pp. 72-81
DOI: 10.2307/2405905
Stable URL: http://www.jstor.org/stable/2405905
Page Count: 10
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Sexual Isolation and Variation in Mating Behavior within Drosophila athabasca
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Abstract

Several geographically different strains of D. athabasca were studied as to sexual isolation and mating behavior. Strains from Wyoming and Michigan showed a marked degree of sexual isolation, though rare matings between Wyoming females and Michigan males did yield fertile hybrids. Strains from New York likewise were strongly isolated from Michigan strains, but some fertile hybrids were obtained between Michigan females and New York males. Wyoming and New York athabasca showed some isolation but crossed much more easily in both reciprocal directions than either did with Michigan, producing fully fertile hybrids. The duration of copulation was found to be long (about 4′ or more) in western strains of athabasca (Wyoming, North Dakota, western Ontario), short (2′ or less) in certain eastern strains (Michigan, New Jersey, New York), while other eastern strains (Michigan, Ontario, Quebec) had either a mixture of short and long matings or exclusively long ones (Quebec). Intermediate mating times were observed in the descendents of Wyoming (long) and New York (short) strains.

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