DIAPAUSE AND FROST-RESISTANCE IN A SLUG CATERPILLAR
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概要
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A common Japanese "slug-caterpillar" Cnidocampa flavescens, enters diapause in autumn as a prepupa in a hard air-tight cocoon and completely terminates it at the beginning of January. Regardless of diapause the frost-resistance of the prepupa in outdoor condition is very high during cold weather and always low during warm weather. In non-diapausing prepupae, even in midwinter, when they are incubated for only a few weeks, a uniformly post-diapause development promptly occurs followed by a remarkable decrease in their cold-hardiness, both in respect to under cooling capacity and in ability to resist body freezing. By incubation for more than 50 days, on the other hand, diapausing prepupae in mid-autumn are never released from diapause, but can apparently be dehardened although the dehardening process is very slow. In the insects treated in this way, only a small degree of enhancement in frost-resistant ability was induced by re-chilling. Even in a highly dehardened condition, the diapausing prepupa is much more frost-resistant than the developing prepupa. Although diapause condition seems to be very beneficial to preserve the frost-resistance, the latter is never lowered merely by the release from the former. Any appreciable decrease in the resistant ability surely is not brought about until the dehardening process has proceeded to a certain extent. Such a process should certainly be much accelerated by the development of morphogenesis.
- 日本昆虫学会の論文
- 1959-03-15