PHOTOPERIODIC CONTROL OF GROWTH AND WING-FORM IN NEMOBIUS YEZOENSIS SHIRAKI (Orthoptera : Gryllidae)
スポンサーリンク
概要
- 論文の詳細を見る
An investigation was carried out in order to know the role played by photoperiod in the univoltine life-cycle of Nemobius yezoensis Shiraki which hibernates as a late instar nymph in a state of diapause. It was found that the nymphal diapause is readily terminated by a long photoperiod (16 hours per day), but it is maintained for a long time by a short one (12 hours). The diapausing nymphs responded to photoperiod in a similar way even after they had experienced a cold rest. From this, it was surmised that the resumption of growth in spring as well as the maintenance of diapause in autumn would be under the imminent control of day length. Further influences of photoperiod were observed on certain morphological traits of the adult. Although the species is virtually micropterous in the field, a number of macropterous specimens arose in certain batches of the long-day treatments. No such specimen occurred in the short-day treatments. Moreover, the long photoperiod tended to increase the body size of the adults, while the short one exerted the opposite effect. These variations in body size seemed to be independent of wing-form inasmuch as the micropterous specimens in the long-day treatments were not significantly smaller than the macropterous ones except the size of their elytra and hind-wings. In the short photoperiod the females always outnumbered the males, probably due to their greater competence to grow under such conditions. On the other hand, both sexes occurred in equal numbers in the long photoperiod.
- 日本昆虫学会の論文
- 1963-02-28