標高が異なる地点のシロモンヤガの発育の比較

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Adults of the spotted cutworm, Xestia c-nigrum LINNE, were caught in areas at different altitudes in central Iwate, Honshu (about 40°N). Their offsprings were reared under constant temperatures ranging between 12.5 and 30℃ with a daily illumination of 16 hr. These local stocks were compared in their developmental characters with one another and with the lowland strain from central Hokkaido (about 43°N). In general, developmental zero for the immature stages was estimated to be between 7.0 and 8.5℃, and some larval and pupal mortality occurred at 30℃. Total developmental duration was longest in the univoltine Iwate-highland stock, shortest in the bivoltine Hokkaido stock, and intermediate in the bivoltine Iwate stocks. Among the last ones, there were few significant differences in developmental time, in spite of the fact that they originated from areas with a wide altitudinal range between 150 and 1,150 m. These three groups also showed different thermal responses in pupal weight. The short developmental time in the Hokkaido strain and the univoltine life-cycle prevailing in the Iwate-highland strain could be interpreted as being associated with genetic adjustment to the low temperature in their original localities. However, the conformity in developmental time among the bivoltine Iwate strains cannot be related to the diverse climates characterizing their original grounds of different altitudes. This puzzling phenomenon may be ascribed to the local altitudinal migration by adults as suggested for the species.
日本応用動物昆虫学会の論文
1985-11-25

標高が異なる地点のシロモンヤガの発育の比較

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