DNA Comparison of Japanese Populations of Hyphantria cunea with Divergent Life Cycles

概要

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The fall webworm, Hyphantria cunea Drury, maintained a bivoltine life cycle throughout its distribution range (39-34°N) for the first 20-30 years after its introduction in 1945 from U.S.A. At present, however, trivoltine populations occur in southwestern districts of the main islands, and multivoltine (more than three generations a year) populations in the Ogasawara Islands (ca. 27°N). The percentage diapause in three local strains with different life cycles under a 14-h daylength at 25℃ was highest in the bivoltine strain, intermediate in the trivoltine strain and lowest in the multivoltine strain. In spite of their divergent life cycles, all the Japanese populations are homologous in the DNA sequence of the cytochrome c oxidase subunit I gene. On the other hand, a native multivoltine strain from Florida indicated a substitution rate of 4.14% compared with Japanese populations. Therefore, the variation in voltinism has been established by natural selection after introduction and is not due to multiple introductions from different parts of U.S.A.
日本昆虫学会の論文
2001-03-25