Ecological and genetic bases related to adaptation of native, non-native, and hybrid populations of stream-dwelling fish

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20667
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0703:Biology at organismal to population levels and anthropology, and related fields
• Research Institution: Tokyo University of Agriculture
• Principal Investigator: Fukui Sho 東京農業大学, 生物産業学部, 助教 (20965553)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 交雑 / 外来種 / サケ科魚類

Outline of Final Research Achievements

To investigate ecological and genetic basis contributing distribution and sustainability of native, non-native, and their hybrid individuals, this study conducted field work and RNA-seq to screening the candidate adaptive genes, using a model system of stream-dwelling fish where long-term ecological data of hybrid individuals has been accumulated. In the results of RNA analysis, some candidate genes related to immunity and metabolism was detected. Such candidate genes might contribute to temperature-adaptation of hybrid individuals in the wild. These results enable a analysis investigating temporal-spatial change of the candidate adaptive genes by using ecological data and genetic samples of hybrid individuals has been accumulated over 10 years.

Free Research Field

進化生態学

Academic Significance and Societal Importance of the Research Achievements

不均質な生息環境のもとで，在来と外来，交雑個体がそれぞれ異なる適応度を示しうる中，どのような遺伝子が在来と外来，交雑個体の適応に寄与するのかという「問い」は，適応進化と外来種の遺伝的リスクの両面において本質的な課題である。本研究の成果は，野外における在来と外来，交雑個体の適応に寄与する遺伝基盤の一端を明らかしたものであり，今後は，研究代表者がこれまで集めてきた生態・環境データと照らし合わせることで，在来と外来，交雑個体の存続に寄与する生態基盤の解明に貢献することが期待される。