Abstract
The adaptive value of experimental populations of Drosophila nebulosa, irradiated each generation with doses of 500, 1000 and 2000 R of Co-60 gamma-rays, was measured with respect to their ability to compete with non-irradiated Drosophila willistoni. Two groups of experiments were developed: ( a) to investigate the effects of repeated irradiation each generation on D. nebulosa under interspecific competition; ( b) to demonstrate the radioresistance of D. nebulosa populations with different histories of irradiation. The results obtained through the interspecific competition were confirmed by tests of egg-laying capacity, hatchability and productivity of D. nebulosa from the competing populations. The populations with previous histories of gamma-irradiation were shown to be less susceptible than control populations to the detrimental effects of a new exposure to irradiation. This suggests that radioresistance developed in the D. nebulosa populations that had been irradiated over several generations.
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