| Project/Area Number |
18380096
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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 |
林学・森林工学
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
YASUYUKI Ishibashi Forestry and Forest Products Research Institute, Hokkaido Research Center, Research Fellow (80353580)
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| Co-Investigator(Kenkyū-buntansha) |
SAITOH Takashi Hokkaido University, 北方生物圏フィールド科学センター, Professor (00183814)
KONNO Yasuo Obihiro Univ. of Agriculture and Veterinary Medicine, 畜産学部, Associate Professor (00111196)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥10,610,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2007: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2006: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | genetic diversity / isolation / habitats / distribution / molecular ecology / fragmentation / small mammals / gene flow / 哺乳類 |
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| Research Abstract |
We examined effects of fragmentation and isolation of habitats on spatial distribution and genetic diversity of small rodent species in Hokkaido, Japan. First, we investigated determinant ecological factors on the distribution of small rodents in a southern part of Obihiro, where there are many isolated woods with various sizes. Myodes rufocanus and Apodemus speciosus were captured in almost all woods but A. argenteus was captured in a limited number of woods. Logistic regression analysis indicated that the distribution of A. argenteus was related to the distance from a large forest beside a river. We also examined the distribution of Sciurus vulgaris by using the camera-trapping technique. Logistic regression analysis indicated that its distribution was related to the size of woods, distances from a large forest beside a river and the presence of Japanese walnuts. Next, we determined a partial sequence of mitochondrial DNA (436 bp) in 673 M rufocanus collected from 34 isolated woods (0.3-7.6 ha), and detected 76 different haplotypes. The number of samples within isolated-woods populations and the observed number of haplotypes were positively correlated. However, there was no correlation between the size of woods and the number of haplotypes within populations. When examined the relationship between geographic distance between woods and genetic distance between populations, no significant relationship was observed. These results suggest that effects of genetic drift within populations on genetic differentiation among populations are much greater than those of gene flow. Taken together, these studies suggest that some rodent species, such as M rufocanus, are distributed in every isolated wood, as if habitat isolation did not affect their distribution, but genetic effects of isolation are not small even in those species. We need to examine both distribution and genetics to preserve local populations of wild animals, especially those with small mobility capability.
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