ヨトウガの幼虫, 蛹および成虫形質にみられる地理的変異

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1. The writer collected egg-batches of the cabbage moth, Mamestra brassicae from eight lacalities distributed from the northern to the south-western part of Japan, viz., Hokkaido to Kyusyu (Table 1). Observations were made on certain characters of larval, pupal and adult stages of these local strains by rearing the insects under the condition of 25℃, of complete darkness and with an initial density of 20 larvae per vial. 2. In the 4th and 5th instar, the Tokyo and Kyoto strains showed higher values in the measurement of head width than those of the strains from the northern and the south-western localities (Fig. 1 and Table 2). 3. The larvae of the northern strains tended to be darker in their skin color and shorter in their larval developmental periods than those of the south-western atrains (Fig. 3). 4. The pupae of the Sapporo and Oita strains were less in weight than those of the Honsyu strains (Table 7). The ratio of the mean pupal weight to the mean length of larval duration was the largeat in the Sendai strain, and it decreased northward as well as south-westward (Fig. 4). 5. The pupae of the Sapporo strain were of non-diapausing, but those of the Honsyu and Kyusyu strains were a mixture of non-diapausing and aestivating types. Furthermore, both the non-diapausing and aestivating pupae of the south-western strains required longer time for pupal development than those of the northern strains (Fig. 5). 6. The sdults of the south-western strains were characterized by their longer life, and shorter duration of their oviposition period, as compared with those of the northern strains. Also, the female moths from the south-western localities deposited less numbers of eggs than those from the northern localities (Table 9).
日本生態学会の論文
1962-08-01

ヨトウガの幼虫, 蛹および成虫形質にみられる地理的変異

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