オオショウジョウバエのハワイ集団における染色体多型の変異〔英文〕

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1. The natural populations of D. immigyans were sampled at various places on three main islands of Hawaii and the inversion polymorphism examined in 1532 “egg samples” and 103 “male samples”. The samples at different places on each island were from dissimilar habitats.2. Three inversions of Chromosomes II were widespread throughout the islands and always present in all the populations studied (except for a few inadequately sampled populations).3. Within each island there is a general similarity from population to population in the relative frequencies of these inversions and in the amount of inversions per individual.4. Nonetheless, signficant differences in some inversion frequencies occurred between certain localities with dissimilar environmental conditions.5. There were consistent results to indicate that the relative frequencies of the inversions remained fairly stable throughout the considerable periods of time in every population sampled more than twice. The general stability is considered to be maintained by selective differences on chromosomal types.6. The relative distribution of the inversions were distinct from one island to another; the differences among islands are considered to be racial differences.7. We are inclined to suggest that the differences shown in (4) and (6) are mostly due to adaptive response, perfected by natural selection, to differences in environmental conditions.8. The magnitude of inversions per individual observed in the Hawaiian population of D. immigrans show a much higher range compared to that reported by other workers for continental areas.9. One paracentric and one pericentric inversions were detected in the Hawaii populations, each at different local; they are probably endemic to the island.
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オオショウジョウバエのハワイ集団における染色体多型の変異〔英文〕

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