The origin of tropical rain forest in Southeast Asia - Quaternary forest dynamics traced by genetic divesity

2017 Fiscal Year Final Research Report

• Project/Area Number: 26304017
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Ecology/Environment
• Research Institution: Ehime University
• Principal Investigator: Harada Ko 愛媛大学, 農学部, 研究員 (40150396)
• Co-Investigator(Kenkyū-buntansha): 上谷 浩一 愛媛大学, 農学研究科, 准教授 (80638792) ; 大久保 達弘 宇都宮大学, 農学部, 教授 (10176844) ; 原 正利 千葉県立中央博物館, その他部局等, 研究員(移行) (20250144)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: フタバガキ / ブナ科 / スンダ地域 / 遺伝的多様性 / 最終氷期 / デモグラフィー解析 / 遺伝構造 / 逃避地

Outline of Final Research Achievements

Lowland evergreen forest and upland evergreen forest of Sundaic region are respectively characterized by abundant Dipterocarpaceae and Fagaceae species. Comparative domographic analysis based on genetic variation using molecular markers was applied on several representative species in these forests, which are broadly distributed in the area to testify the opposing hypothesis about the condition of the tropical rain forest in the last glacial maximum (LGM). Both Dryobalanops aromatica and Shorea curtisii showed clear genetic structure between groups of Malay-Sumatra and Borneo populations. Splitting time of the two groups was estimated far beyond the LGM, which occurred 20,000 years ago. This suggests that tropical rain forest at the LGM was divided into two main refugia in Borneo and in Malay-Sumatra probably by savanna corridor between them. Frequent gene flow revealed in D. aromatica suggests that the corridor was not completely continuous and interrupted by forests in some places.

Free Research Field

温帯および熱帯域の森林樹木の集団遺伝学