Diversity created by threats: the evolutionary explosion of molluscan fauna in Russia and Vietnam

• Project/Area Number: 17H04611
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Ecology/Environment
• Research Institution: Tohoku University
• Principal Investigator: Chiba Satoshi 東北大学, 東北アジア研究センター, 教授 (10236812)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000); Fiscal Year 2019: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2018: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000); Fiscal Year 2017: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
• Keywords: 生物多様性 / 種分化 / 適応 / 多様化 / 軟体動物 / 東北アジア / 共進化 / 放散 / 生物地理 / 進化 / 生態学 / 遺伝子

Outline of Final Research Achievements

Field survey and molecular phylogenetic analysis of terrestrial and freshwater molluscs in the Russian Far East, Vietnam and surrounding areas indicate that niche diversity potentially increase speciation rates and contribute to species diversity. On the other hand, in some cases, the abundance of resources (the amount of calcium carbonate required for shell formation) is likely to increase population density and thus, ecologically neutral processes can promote speciation and increase species diversity. The present results suggest that the predator-prey relationship increase phenotypic diversity and promote speciation and increase species diversity. These results indicate that ecological processes play an important role in the evolution of species diversity .

Academic Significance and Societal Importance of the Research Achievements

従来、たロシア極東地域とベトナム―中国南部の生物相は、生物多様性のホットスポットとして重視されながら、その実態が未知であった。本研究は、その形成要因を、陸、淡水貝類をモデルとして解明し、環境が多様性をもたらすの鍵であることを示すことができた。この成果は、本地域の生物相が、保全上の高い価値を持つことを示す。さらにこの成果は、現在急速に劣化しつつある本地域の生物相を保全することの重要性と緊急性を示している。

Research Products

• [Int'l Joint Research] ロシア科学アカデミー極東支部(ロシア連邦)
• [Int'l Joint Research] ベトナム科学アカデミー(ベトナム)
• [Int'l Joint Research] 慶北大学(韓国)
• [Int'l Joint Research] ロシア科学アカデミー極東支部(ロシア連邦)
• [Int'l Joint Research] ベトナム科学技術アカデミー(ベトナム)
• [Journal Article] Role of ancient lakes in genetic and phenotypic diversification of freshwater snails (2019)
  • Author(s): Hirano, T., Saito, T., Tsunamoto, Y., Koseki, J., Prozorova, L., Do Van Tu, Matsuoka, K., Nakai, K., Suyama, y., & Chiba, S.
  • Journal Title: Molecular Ecology Volume: 23 Issue: 23 Pages: 5032-5051
  • DOI: 10.1111/mec.15272
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Enigmatic incongruence between mtDNA and nDNA revealed by multi-locus phylogenomic analyses in freshwater snails. (2019)
  • Author(s): Hirano T., Saito T., Tsunamoto Y., Koseki J., Bin Ye, Van Do, Miura O., Suyama Y., Chiba S.
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 6223-6223
  • DOI: 10.1038/s41598-019-42682-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An updated checklist of land and freshwater gastropod fauna on Ulleung Island, South Korea. (2019)
  • Author(s): Kimura K., Saito T., Chiba S. & Pak J.H.
  • Journal Title: American Malacological Bulletin Volume: 37 Issue: 1 Pages: 35-39
  • DOI: 10.4003/006.037.0104
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Molecular phylogeny of glacial relict species: a case of freshwater Valvatidae molluscs (Mollusca: Gastropoda) in North and East Asia (2018)
  • Author(s): Takumi Saito, Larisa Prozorova, Tatiana Sitnikova, Purevdorj Surenkhorloo, Takahiro Hirano, Yuta Morii & Satoshi Chiba.
  • Journal Title: Hydrobiologia Volume: 印刷中 Issue: 1 Pages: 105-118
  • DOI: 10.1007/s10750-018-3595-y
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Endangered freshwater limpets in Japan are actually alien invasive species. (2018)
  • Author(s): Saito, T., Van Tu Do, Prozorova, L., Hirano, T., Fukuda, H. & Chiba, S.
  • Journal Title: Conservation Genetics Volume: 19 Issue: 4 Pages: 947-958
  • DOI: 10.1007/s10592-018-1068-5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Recent lake expansion triggered the adaptive radiation of freshwater snails in ancient Lake Biwa. (2018)
  • Author(s): Miura, O., Urabe, M., Nishimura, T., Nakai, K., & Chiba, S.
  • Journal Title: Evolution Letters Volume: 2 Issue: 1 Pages: 43-54
  • DOI: 10.1002/evl3.92
  • Peer Reviewed / Open Access
• [Journal Article] Phylogeography of freshwater planorbid snails reveals diversification patterns in Eurasian continental islands. (2018)
  • Author(s): Saito, T., Hirano, T., Prozorova, L. A., Do Van Tu, Sulikowska-Drozd, A., Sitnikova, T., Surenkhorloo, P., Yamazaki, D., Morii, Y., Kameda, Y., Fukuda, H., & Chiba, S.
  • Journal Title: BMC Evolutionary Biology Volume: 18 Issue: 1 Pages: 164-164
  • DOI: 10.1186/s12862-018-1273-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] (2017) Genetic diversification of intertidal gastropoda in an archipelago: The effects of islands, oceanic currents and ecology. (2017)
  • Author(s): Yamazaki, D., Miura, O., Ikeda, M., Kijima, A., Do Van Tu, Sasaki, T., & Chiba, S.
  • Journal Title: Marine Biology Volume: 164
  • Peer Reviewed
• [Presentation] 東アジア産イシダタミ属貝類の集団遺伝構造・生息地嗜好性の比較 (2018)
  • Author(s): 山崎大志・内田翔太・三浦 収・ 池田 実・千葉 聡
  • Organizer: 日本貝類学会