| Project/Area Number |
23405012
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
FUJIYAMA Naoyuki 北海道教育大学, 教育学部, 准教授 (90360958)
KATOH Toru 北海道大学, 理学(系)研究科(研究院), 助教 (80374198)
KOJI Shinsaku 金沢大学, 地域連携推進センター, 博士研究員 (10447683)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2013: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2012: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2011: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Keywords | ニジュウヤホシテントウ / 東南アジア / 寄主特異性 / 生態的種分化 / 食草変換 / 食草拡大 / インドネシア / マレーシア / ムラサキチョウマメモドキ / 地理変異 / 小進化 |
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| Research Abstract |
On the basis of field observations, food choice tests, rearing experiments and an analysis of mitochondrial DNA sequences, we studied spatio-temporal dynamics of host changes of Henosepilachna vigintioctopunctata in Southeast Asia. The primary host plants of this species are considered to be solanaceous plants. However, the populations utilizing an introduced legume "centro" were widespread in the southern part of the Malay Peninsula, Java, Sumatra, and western Kalimantan. They were not common or absent in more eastern areas. The DNA analysis suggested multiple origins of the centro-feeding trait in solanum-feeding populations in Southeast Asia. No convincing evidence was obtained for the divergence of H. vigintioctopunctata along the two host plants, or for the host change from solanum to centro. Even the centro feeding populations showed an extended larval period and small body size on centro, suggesting that they were not yet fully adapted physiologically to this plant.
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