| Project/Area Number |
16K14804
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Ecology/Environment
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| Research Institution | Tohoku University |
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Principal Investigator |
Chiba Satoshi 東北大学, 東北アジア研究センター, 教授 (10236812)
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| Research Collaborator |
UCHIDA Shota
SHINOBE Shotaro
AKIYAMA Kao
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 保全 / 外来種 / 絶滅 / 適応 / 捕食ー被食 / 外来生物 / 海洋島 / 陸貝 / 進化 / 生態学 |
|---|
| Outline of Final Research Achievements |
Serious impacts of nonnative malacophagous flatworms on native land snails on the Ogasawara Island were detected, and medium size-large species have become mostly extinct on Chichijima. However, native micro snails were still survive and widely distributed on the island. Nonnative land snails Acusta and Satsuma were not affected by flatworms and extended their distributions. Mucus of native land snails attract flatworms, while mucus of nonnative species exhibited repellent action against flatworms. In addition, Acusta avoid attack of the flatworms by active defense behavior. These characteristics appear to be a result of adaptation against predation of flatworms on mainland, and are effective to mitigate impacts of the nonnative predators.
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