2004年8月
Adaptive change and conservatism in host specificity in two local populations of the thistle-feeding ladybird beetle Epilachna niponica
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
- ,
- ,
- 巻
- 112
- 号
- 2
- 開始ページ
- 145
- 終了ページ
- 153
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- 出版者・発行元
- BLACKWELL PUBLISHING LTD
We investigated geographic differences in the host specificity of Epilachna niponica Lewis (Coleoptera: Coccinellidae). The Yuwaku population feeds mainly on Cirsium matsumurae Nakai (Asteraceae) and secondarily on Cirsrium kagamontanum Nakai. The Asiu population, located 150 km away from the Yuwaku, feeds exclusively on C. ashiuense Yokoyama et T. Shimizu. Under laboratory conditions, we examined the differences between the two populations in adult feeding acceptance, adult feeding preference, and larval performance, using several closely related thistle species and varieties, including their native hosts. In the Asiu population, adult beetles clearly avoided the host of the Yuwaku population, C. kagamontanum, and no larvae were able to complete their development, whereas in the Yuwaku population, adults accepted and even preferred it to some other thistle species, and about 10% of first instar larvae became adults. This indicates that the Yuwaku population evolved its feeding preference and physiological adaptation to C. kagamontanum through a utilization of this low-ranked host under natural conditions. Apart from C. kagamontanum, the two populations showed a similar host susceptibility pattern, indicating that this ladybird beetle has a conserved hierarchy in feeding preference and growth performance. We also observed adult leaf choice behavior when given different thistle species, and found that difference in biting rate after palpation determined the leaf areas consumed, implying that factors on the leaf surface played an important role in the choice.
- リンク情報
- ID情報
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- ISSN : 0013-8703
- Web of Science ID : WOS:000223268800009