| Project/Area Number |
09044202
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Field |
生態
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SHIMADA Masakazu The University of Tokyo, Graduate School of Arts and Sciences, Associate Professor, 大学院・総合文化研究科, 助教授 (40178950)
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| Co-Investigator(Kenkyū-buntansha) |
BONSALL M.B. Imperial College, Department of Biology, Lecturer, 生物学科, 講師
CRAWLEY M. Imperial College, Department of Biology, Professor, 生物学科, 教授
MUELLER C.B. Imperial College, Department of Biology, Lecturer, 生物学科, 講師
SASAKI Akira Kyushu University, Faculty of Sciences, Associate Professor, 理学部, 助教授 (90211937)
IWASA Yoh Kyushu University, Faculty of Sciences, Professor, 理学部, 教授 (70176535)
HASSELL M.P. インペリアルカレッジ, 生物学科, 教授
GODFRAY H.C. インペリアルカレッジ, 生物学科, 教授
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1998: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1997: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | Host / Parasitoid / Population dynamics / System persistence / Pathogen / Intracellular symbiont / Spatial distribution / Metapopulation / 寄主-寄生者系 / メタ固体群系 / 共進化 / 時系列解析 / 固体数動態 / 空間構造 / 進化のゲーム理論 / 寄生峰 |
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| Research Abstract |
(1) Parasitism rate, population fluctuations and persistence in host-parasitoid systems
Change in population fluctuations and the persistence were examined with changing parasitizing behaviors in host-parasitoid systems. Shimada managed experimental systems. Results showed too high parasitizing rate made population fluctuations larger and the mean population size lower, resulting in weaken the system persistence. Prof.M.Crawley and Dr.M.Bonsall (Lecturer) were invited from Imperial College, and we discussed about the project.
(2) Coevolution in host-parasitoid systems
As evolutionary changes in population dynamics of host-parasitoid systems, Shimada studied host insects and intracelluar symbionts in the field and laboratory systems, and Godfray examined insect hosts and pathogen systems. Based on those data, Iwasa and Sasaki analyzed coevolutionary game of host-parasite systems. In addition, M.Bonsall cooperated with M.Tuda (a collaborator in 1997) to analyzed coevolutionary model based on her data.
(3) Studies on community structures of host-parasitoid system
Godfray targeted plants-aphids-parasitoids systems and Shimada did legumes-bruchids-parasitoids communities for quantitative community structures. Then, Shimada visited Imperial College and discuss about the project with Godfray and M.Hassell.
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