A new model of evolution:diversification in the Japan Sea and its world-wide impact

2017 Fiscal Year Final Research Report

• Project/Area Number: 26304010
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Biodiversity/Systematics
• Research Institution: Kanazawa University
• Principal Investigator: Kamiya Takahiro 金沢大学, 自然システム学系, 教授 (80194976)
• Co-Investigator(Kenkyū-buntansha): 阿部 剛史 北海道大学, 総合博物館, 講師 (00301929) ; ジェンキンズ ロバート 金沢大学, 自然システム学系, 助教 (10451824) ; 山田 敏弘 金沢大学, 自然システム学系, 准教授 (70392537) ; Smith Robin 滋賀県立琵琶湖博物館, その他部局等, 専門学芸員 (70416204)
• Research Collaborator: Chand Prerna 金沢大学, 自然システム学系, 博士研究員 ; Horne David Queen Mary Univeristy, 教授
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 貝形虫 / 種分化 / 北方進出 / 日本海 / 寒冷適応 / 多様化

Outline of Final Research Achievements

The present study revealed the evolutionary event which showed the intertidal ostracods diversified, got to be cold tolerant, and invaded northwards through the Sea of japan during late tertiary and Quaternary. The studied taxon was a genus Boreostoma of subfamily Paradoxostomatinae. Their worldwide distribution was examined and the result showed that an ancestral species appeared in Kuroshio area and the species spectated and diversified in the Sea of Japan, then proceeds northwards to reach Oyashio area of eastern Hokkaido. The species reached Oyashio area speciated again to finally distributed high latitudes of northern hemisphere, e.g. western coast of Canada and southern coast of Britain. The DNA analysis clearly showed that it took relatively long for the evolutionary event to reach from Kuroshio to Oyashio areas, but relatively short to spread from Oyashio area to Canada and Britain, which seems interesting to take the geographical distance into consideration.

Free Research Field

分類・多様性