2006 Fiscal Year Final Research Report Summary
Phylogeography of the component plant species and phytophagous insects of warm temperate region in Taiwan and Japan
| Project/Area Number |
16405014
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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 | 海外学術 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Tokyo Metropolitan University (2006)
Kyoto University (2004-2005) |
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Principal Investigator |
MURAKAMI Noriaki Tokyo Metropolitan University, Graduate School of Science and Engineering, Professor, 大学院理工学研究科, 教授 (60192770)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Makoto Kyoto University, Graduate School of Human and Environmental Studies., Professor, 人間・環境学研究科, 教授 (80204494)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Taiwan / phylogeography / warm temperate region / chloroplast DNA / nucleotide sequence / phytophagous insects / evergreen broad-leaved forests |
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| Research Abstract |
We performed phylogeographic studies of the component plant species of warm temperate regions of Taiwan and Japan using allozyme and nucleotide sequencing analyses. We mainly examined Farfugium japonicum and Peucedanum japonicum after collecting their plant materials from various locaities of Taiwan and Japan. We formerly elucidated that populations of these plant species in Southern Ryukyu (Is.Ishigaki and Is. Iriomote) are genetically well differentiated from those of Middle and Northern Ryukyu (the Okinawa Isls., the Amami Isls., the Tokara Isls.). It was considered that this phenomenon was caused by genetic exchange between the populations of Southern Ryukyu and Taiwan. However, the results of this study clearly revealed that populations of Southern Ryukyu are genetically well differentiated even from those of Taiwan in these two plant species. Therefore, it was strongly suggested that Southern Ryukyu populations of F.japonicum and P.japonicum have been separated maybe geographically either from Taiwan or the other regions of Ryukyu for long times so that they obtained genetical uniqueness.
Another interesting findings of this study is genetic similarities between populations of these two plant species from LanYu Island of Taiwan and Middle Ryukyu. The populations of of F.japonicum and P.japonicum of LanYu are genetically more similar to those of Okinawa and Amami Islands than those of Taiwan based on allozyme analysis. They also share haplotypes of chloroplast DNAs. Taking that Lanyu Island was recently formed volcanic island into account, the plant populations of the islands were established by rare long distance dispersal from Middle Ryukyu. It is very interesting that long distance dispersal from north to south was suggested in this species because mostly dispersal events from south to north are often documented in the past phytogeographical studies.
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