The mechanism of shaping hybrid zones in fishes of the North Pacific

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K06808
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 45030:Biodiversity and systematics-related
• Research Institution: Kyoto University
• Principal Investigator: Kai Yoshiaki 京都大学, フィールド科学教育研究センター, 准教授 (30379036)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 種間交雑

Outline of Final Research Achievements

Intraspecific hybridization is one of the important processes that dive the evolution and accumulate the diversity within a species. However, intraspecific hybridizations in marine realm have not been well documented. In this study, I investigated how and where intraspecific hybridizations are occurring. As a result, intraspecific hybridizations were detected between Stichaeus nozawae and Stichaeus grigorjewi as a past event. In addition, some species pairs of Ammodytes, Icelus, Pallasina and Aptocyclus were hybridized around the biogeographic boundaries in the western North Pacific, such as the northern Sea of Japan, around the Tsugaru Strait, and the Kamchatka Peninsula.

Free Research Field

魚類分類学

Academic Significance and Societal Importance of the Research Achievements

海産魚類の種間交雑や交雑帯についての研究は，淡水魚類に比べるとはるかに少なく，どのような要因で交雑帯が形成され，種が混じり合わずに交雑帯の範囲が維持されているのかは不明なままであった．今回の研究成果は，海産魚類でも過去・現在を問わず種間交雑が起こっていること，その結果，遺伝子レベルの生物多様性に何らかの貢献をしていることが示された．また，交雑帯は生物地理学的な境界に形成・維持されていることが多いことから，そのような場所を保全していくことで生物多様性を維持できる可能性がある．