2021 Fiscal Year Final Research Report
The evolutionary history and an intermediate stage of speciation of a giant water bug
Project/Area Number |
19K16209
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 45030:Biodiversity and systematics-related
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Research Institution | Shinshu University |
Principal Investigator |
Suzuki Tomoya 信州大学, 理学部, 理学部博士研究員 (30739503)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 種分化 / コオイムシ / 分子系統解析 / 交配実験 / 生殖隔離 |
Outline of Final Research Achievements |
The intermediate stages of speciation are important for understanding the processes involved in the creation of biodiversity, and also comprise a number of interesting phenomena. In this study, I presented an example of a species in an intermediate stage of speciation using the giant water bug Appasus japonicus (Heteroptera, Belostomatidae) that was investigated using mating experiments and phylogenetic analyses of the mtDNA, and nDNA SSR and its genome-wide SNPs. The results suggested that their ancestral lineage which being distributed in the Japanese Archipelago subsequently migrated to the Eurasian Continent (i.e., “back-dispersal” occurred). Furthermore, the results of the mating experiments suggested that among A. japonicus, even between closely related lineages, pre-mating reproductive isolation has been established by the differentiation of copulatory organ morphologies.
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Free Research Field |
進化生物学
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Academic Significance and Societal Importance of the Research Achievements |
本研究の成果は,「生物の種分化・多様化がどのようにして生じるのか?」という生物学の大きな問いを紐解くための重要なピースになると言える。加えて、生物学最大の命題である「種」の定義・概念にも一石を投じる重要な知見でである。現在、最も広く受け入れられている「生物学的種概念」は「生殖的な隔離の有無」を基盤としているが、本研究課題では、系統進化のプロセスと生殖的隔離の程度が一致しないという、極めて希少かつ興味深い事象を明らかにした。「種概念」や「種分化」研究における重要な研究成果になると考えられる。
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