著者

橋本 健一 Ken-ichi HASHIMOTO 千葉県立衛生短期大学(生物学) Chiba College of Health Science

雑誌

千葉県立衛生短期大学紀要 = Bulletin of Chiba College of Health Science (ISSN:02885034)

巻号頁・発行日

vol.13, no.2, pp.3-9, 1994

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In the velvet swallowtail butterfly, Papilio bianor dehaanii, there is a seasonal morph such as the spring-and summer-forms. When larvae were reared under a short photoperiod (less than LD 8 : 16hr.), all of them entered into pupal diapause and subsequently developed into small adults of the spring-form. On the other hand, under a long one (under room conditions), they all averted diapause and developed into large summer-form adults. The front wing length and size of the pupae were significantly different between diapause and non-diapause groups. It thus appears that a seasonal morph reflected in the size was deter-mined simultaneously by photoperiod during the larval period. When diapausing pupae were kept under various periods of chilling at 4℃, the longer the chilling brought the earlier onset of adult emergence and a narrower range of emergence. A well synchronized emergence from diapausing pupae was brought about by chilling for 140 days. In the Japanese swallowtail butterfly, Papilio xuthus, when larvae were reared under natural conditions in autumn, all of them entered into the pupal diapause. Three groups of diapausing pupae, that had overwintered from late autumn under natural conditions, were transfered to 20℃ conditions on Jan. 14, Mar. 2 and Apr. 4 respectively. In most of the diapausing pupae which had been transfered on Mar. 2 or Apr. 4, adult emergence occured within 20 days after the onset of incubation at 20℃. It thus seems that pupal diapause of them had terminated during their overwintering period.

著者

橋本 健一 Ken-ichi HASHIMOTO 千葉県立衛生短期大学

雑誌

千葉県立衛生短期大学紀要 = Bulletin of Chiba College of Health Science (ISSN:02885034)

巻号頁・発行日

vol.26, no.2, pp.1-7, 2008

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ナガサキアゲハPapilio memnon thunbergii SieboldおよびクロアゲハPapilio protenor demetrius Stollの千葉県鴨川市個体群(35°07'N)の20℃での蛹休眠誘起の臨界日長はナガサキアゲハでは約12時間40分,クロアゲハでは14時間以上であり,ナガサキアゲハの臨界日長は同所的に生息するクロアゲハより1時間以上短かった。ナガサキアゲハ鴨川市個体群の臨界日長は既に報告されている鹿児島市,和歌山市,箕面市,清水市および三浦市の各個体群での値(Yoshio and Ishii 1998, 2004)とほぼ同様であるので,本種は休眠性の変化を伴わずに北方へ分布を拡大しているものと思われる。このような分布の拡大は,秋季の気温の上昇により休眠世代の幼虫が蛹化に至るまでの温量が得られるようになったことが要因の1つであると考えられる。