Experiments on Sexual Isolation in Drosophila

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Abstract
Mating takes place with or without light in D. persimilis and D. pseudoobscura, while D. subobscura mates only in the presence of light, [male] [male] of D. persimilis and D. pseudoobscura inseminate some D. sub-obscura [female] [female] , the frequency of this cross-insemination being greater in the light than in the dark. D. subobscura [male] [male] in-seminate some [female] [female] of the other 2 spp. in the light but not in the dark. Light intensity of the order of 30 foot-candles was found to be close to the optimum for mating in D. subobscura, but no mating and no courtship take place in this sp. in red light of an intensity which permits observation. Direct observations disclose that, in the light, [male] [male] of any one of the 3 spp. court about equally frequently [female] [female] of their own and of the other 2 spp. However, interspecific copulation occurs only seldom, and if it does the [female] dislodges the [male] in usually <30 sec., ordinarily before sperm ejaculation takes place.

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