| Project/Area Number |
17370006
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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 | 一般 |
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| Research Field |
Ecology/Environment
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SAITOH Takashi Hokkaido Univ., Field Science Center for Northern Biosphere, Assoc. Prof., 北方生物圏フィールド科学センター, 助教授 (00183814)
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| Co-Investigator(Kenkyū-buntansha) |
MAEKAWA Kohji Hokkaido Univ., Field Science Center for Northern Biosphere, Prof., 北方生物圏フィールド科学センター, 教授 (80002301)
ISHIBASHI Yasuyuki Hokkaido Research Center, Forestry and Forest Products Research Institute, Senior Researcher, 北海道支所, 主任研究員 (80353580)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 2006: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 2005: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | the grey-sided vole / population dynamics / genetic spatial structure / geographic variation / DNA / 周期性 |
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| Research Abstract |
Population Ecology, which is aimed to analyze patterns of population dynamics and spatial distribution and to elucidate mechanisms generating those patterns, is one of research fields of Ecology. Ecological studies on rodent populations have traditionally led this research field since Charles S. Elton (1924). Studies on rodent populations in Hokkaido, Japan have been well known with rich time series data sets. Although various analyses of temporal changes in rodent abundance have been done using those data sets, the relationship between temporal changes in abundance and spatial structure of the populations is a new perspective of this research field.
In this study, we focus a geographic gradient of the pattern of population dynamics observed in grey-sided vole populations in Hokkaido: populations in north-eastern parts are cyclic, whereas those in south-western parts are non-cyclic and we expected that genetic spatial structure of the populations show a similar geographic gradient. However, the genetic spatial structure was more complex than expected. Genetic distances were short among some remote populations and genetic distances among some neighboring populations were long as well as those among remote populations. Those results indicate that genetic spatial structure of the vole population was not formed by geographic factors (distance or topography) and that ecological factors may be more important.
Problems on complex genetic spatial structure have recently attracts many researchers and may develop to a hot topic in Molecular Ecology. This study may contribute to this research field by suggesting importance of ecological factors on those problems.
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