Adaptive radiation of the Callicarpa genus in the Bonin Islands revealed through double-digest restriction site-associated DNA sequencing analysis.

Autor: Setsuko S; Department of Forest Molecular Genetics and Biotechnology, Forestry and Forest Products Research Institute Forest Research and Management Organization Tsukuba Ibaraki Japan., Narita S; Graduate School of Agriculture Kyoto University Sakyo-ku Kyoto Japan., Tamaki I; Faculty of Applied Biological Sciences, Gifu Field Science Center Gifu University Gifu Gifu Japan., Sugai K; Institute of Agricultural and Life Sciences Academic Assembly, Shimane University Matsue Shimane Japan., Nagano AJ; Faculty of Agriculture Ryukoku University Otsu Shiga Japan.; Institute for Advanced Biosciences Keio University Tsuruoka Yamagata Japan., Ujino-Ihara T; Department of Forest Molecular Genetics and Biotechnology, Forestry and Forest Products Research Institute Forest Research and Management Organization Tsukuba Ibaraki Japan., Kato H; Makino Herbarium Tokyo Metropolitan University Hachioji Tokyo Japan., Isagi Y; Graduate School of Agriculture Kyoto University Sakyo-ku Kyoto Japan.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2024 Sep 13; Vol. 14 (9), pp. e70216. Date of Electronic Publication: 2024 Sep 13 (Print Publication: 2024).
DOI: 10.1002/ece3.70216
Abstrakt: The Bonin Islands, comprised of the Mukojima, Chichijima, and Hahajima Islands, are known for their isolated and distinctive habitats, hosting a diverse array of endemic flora and fauna. In these islands, adaptive radiation has played a remarkable role in speciation, particularly evident in the Callicarpa genus that is represented by three species: Callicarpa parvifolia and C. glabra exclusive to the Chichijima Islands, and Callicarpa subpubescens , distributed across the entire Bonin Islands. Notably, C. subpubescens exhibits multiple ecotypes, differing in leaf hair density, flowering time, and tree size. In this study, we aimed to investigate species and ecotype diversification patterns, estimate divergence times, and explore cryptic species within Callicarpa in the Bonin Islands using phenotypic and genetic data (double-digest restriction site-associated DNA sequencing). Genetic analysis revealed that C. parvifolia and C. glabra both formed single, distinct genetic groups. Conversely, C. subpubescens consisted of six genetic groups corresponding to different ecotypes and regions, and a hybrid group resulting from the hybridization between two of these genetic groups. Population demography analysis focusing on six Chichijima and Hahajima Islands-based species/ecotypes indicated that all species and ecotypes except one ecotype diverged simultaneously around 73-77 kya. The star-shaped neighbor-net tree also suggests the simultaneous divergence of species and ecotypes. The species and ecotypes that simultaneously diverged adapted to dry environments and understory forests, suggesting that aridification may have contributed to this process of adaptive radiation. Moreover, leaf morphology, flowering time, and genetic analyses suggested the presence of two cryptic species and one hybrid species within C. subpubescens .
Competing Interests: Authors declare no competing interests.
(© 2024 The Author(s). Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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