Establishment, expansion and adaptive characteristics of an invasive tree (Bischofia javanica) in Pacific islands.
| Project/Area Number |
18780125
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学・森林工学
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
YAMASHIA Naoko Forestry and Forest Products Research Institute, 関西支所, 主任研究員 (70353901)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥5,530,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥630,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | 森林生態 / 保護 / 保全 / 外来種 / 海洋島 / 種子散布 / 根絶 / 侵入種 |
|---|
| Research Abstract |
Aim of this study was to evaluate the risk of re-establishment of invasive tree Bischofia javanica after eliminating the B.javanica using glyphosate herbicide. Seedling emergence ratio of B.javanica was decreased nearly zero 2 years after killing the upper trees. So it is important to remove emerged B.javanica seedlings at least 2 years after the elimination of upper trees. Seedling emergence was much lower for native trees. and damage by invasive rodent Rattus rattus may be the one factor of restricting the number of seedlings. After killing the B.javanica trees, seeds of B.javanica was dispersed by birds and fall into the seeds traps. The rate of seeds re-entering was high in the traps located within 70m from nearest mother tree. To kill reproductive trees of B.javanica not contribute to increase emergence and growth of native trees, rather enhance the seedling establishment of B.javanica itself and reproductive success of other alien trees. To conserve native forest, it is nesesary to kill not only B.javanica but also other alien trees at one time.
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Report
(4 results)
Research Products
(27 results)
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[Journal Article] Developing a pre-entry weed risk assessment system for use in Japan2008
Author(s)
Nishida, T., Yamashita N., Asai, M., Kurokawa, S., Enomono. T., Pheloung, C.P., Groves, R.H.
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Journal Title
Biological Invasions 11
Pages: 1319-1333
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Peer Reviewed
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[Presentation] A risk assessment system for plants before their entry in Japan -an adaptation of the Australian weed risk assessment system2009
Author(s)
Nishida, T., Yamashita, N., Asai, M., Kurokawa, S., Enomoto, T., Pheloung, P.C., Groves, R.H.
Organizer
国際生物多様性の日シンポジウム-外来種の来た道・行く道-ポスター発表
Place of Presentation
国連大学ウ・タント国際会議場(東京都)
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[Book] Restoring the oceanic island ecosystem.Impact and management of invasive alien species in the bonin islands(eds. K. Kawakami and I. Okochi, Seed and seedling demography of invasive and native trees of subtropical pacific islands.Part II Impact of alien invasive species.)2010
Author(s)
Yamashita, N., Tanaka, N., Hoshi, Y., Kushima, H., Kamo, K.
Publisher
Springer
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