Details of a Researcher

Kon Takeshi

写真a

Title	Special Professor
Researcher Number(JSPS Kakenhi)	10401192

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Current Affiliation Organization 【 display / non-display 】

Duty University of the Ryukyus Organization for Research Promotion Research Planning Office Special Professor

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External Career 【 display / non-display 】

2002.04

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2011.03
2011.04

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2014.03

Toho University
2015.02

　

　

University of the Ryukyus
2022.04

　

　

University of the Ryukyus

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Affiliated academic organizations 【 display / non-display 】

　

　

　

THE ICHTHYOLOGICAL SOCIETY OF JAPAN
　

　

　

PALAEONTOLOGICAL SOCIETY OF JAPAN

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Research Interests 【 display / non-display 】

海洋生物学
魚類
隠蔽種
種分化
幼形進化

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Research Areas 【 display / non-display 】

Life Science / Evolutionary biology
Life Science / Biodiversity and systematics
Life Science / Biodiversity and systematics

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Acquisition of a qualification 【 display / non-display 】

Small Craft Control Person

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Thesis 【 display / non-display 】

Diversity and evolution of life histories of gobioid fishes from the viewpoint of heterochrony: Contribution to ichthyofauna of the Ryukyu Islands

2002.03

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Published Papers 【 display / non-display 】

A new perspective on the evolution of "Kawara" roof tiles in Ryukyu: A multidisciplinary non-destructive analysis of roof tile transition at Shuri Castle, Ryukyu Islands, Japan

Aoyama Hiroaki, Yamagiwa Kaishi, Taira Wataru, Kon Takeshi

PLOS ONE ( PLoS ONE ) 17 ( 11 ) e0277560 - e0277560 2022.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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A unique historical architecture was created at Shuri Castle (Shuri-jo) in the Ryukyu Islands by its “Kawara” roof tiles. After the 13th and 14th centuries, Kawara tiles were introduced to the Ryukyu Islands from several regions, including China, Korea, and mainland Japan, and evolved shapes and patterns that are unique to this island region. However, the transition of some internal features, such as the chemical components and microstructure, had not been analyzed. This study used a multi-faceted approach for such internal data and non-destructive quantitative methods to propose a new perspective on the evolution of historical Ryukyuan Kawara. We analyzed two styles of Ryukyuan Kawara from the 13th to 15th centuries and found that the material processing and firing conditions of the two styles were very similar, even though it had been suggested that they had different origins. A quantitative analysis of tiles from the 16th to 19th centuries revealed a transition in color tone to red, leading to the modern traditional Ryukyuan tiles; traces of changes in firing conditions were also found along with this transition. Finally, the study revealed that the evolution of Ryukyuan Kawara consisted of changed factors, e.g. surface color, and unchanged factors, e.g. paste density. Previous archaeological studies mainly focused on changing external characteristics, such as form and pattern; however, our analysis showed that the internal features changed, while the elemental composition and paste density remained constant from the appearance of the roof tiles until the 19th century. We propose that this is related to different responses of individual factors to external stressors, such as the social context, which may be common to other archaeological artifacts as well. Our study provides a new perspective on the evolution of Ryukyuan Kawara and presents a different discussion of and methods for the chronological study of material culture.
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Mesozoic origin and 'out-of-India' radiation of ricefishes (Adrianichthyidae)

Yamahira Kazunori, Ansai Satoshi, Kakioka Ryo, Yaguchi Hajime, Kon Takeshi, Montenegro Javier, Kobayashi Hirozumi, Fujimoto Shingo, Kimura Ryosuke, Takehana Yusuke, Setiamarga Davin H. E., Takami Yasuoki, Tanaka Rieko, Maeda Ken, Tran Hau D., Koizumi Noriyuki, Morioka Shinsuke, Bounsong Vongvichith, Watanabe Katsutoshi, Musikasinthorn Prachya, Tun Sein, Yun L. K. C., Masengi Kawilarang W. A., Anoop V. K., Raghavan Rajeev, Kitano Jun

BIOLOGY LETTERS ( Biology Letters ) 17 ( 8 ) 20210212 - 20210212 2021.08 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The Indian subcontinent has an origin geologically different from Eurasia, but many terrestrial animal and plant species on it have congeneric or sister species in other parts of Asia, especially in the Southeast. This faunal and floral similarity between India and Southeast Asia is explained by either of the two biogeographic scenarios, ‘into-India’ or ‘out-of-India’. Phylogenies based on complete mitochondrial genomes and five nuclear genes were undertaken for ricefishes (Adrianichthyidae) to examine which of these two biogeographic scenarios fits better. We found that <italic>Oryzias setnai</italic> , the only adrianichthyid distributed in and endemic to the Western Ghats, a mountain range running parallel to the western coast of the Indian subcontinent, is sister to all other adrianichthyids from eastern India and Southeast–East Asia. Divergence time estimates and ancestral area reconstructions reveal that this western Indian species diverged in the late Mesozoic during the northward drift of the Indian subcontinent. These findings indicate that adrianichthyids dispersed eastward ‘out-of-India’ after the collision of the Indian subcontinent with Eurasia, and subsequently diversified in Southeast–East Asia. A review of geographic distributions of ‘out-of-India’ taxa reveals that they may have largely fuelled or modified the biodiversity of Eurasia.
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First record of the schindler’s fish, Schindleria praematura (actinopterygii: perciformes: schindleriidae), from the red sea

Mohamed A. Abu El-Regal and Takeshi Kon

Acta Ichthyologica et Piscatoria 49 ( 1 ) 75 - 78 2019.03

Type of publication: Research paper (scientific journal)
琉球大学研究企画室の活動～学内外セクターとの連携強化を中心に

西田睦, 昆健志, 高橋そよ, 羽賀史浩, 殿岡裕樹

産学連携学 ( 特定非営利活動法人産学連携学会 ) 15 ( 1 ) 1_30 - 1_40 2019

Type of publication: Research paper (scientific journal)

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<p>昨今, 世界と日本社会は大きくかつ急速に変化しつつあり，大学が社会で大きな役割を果たすことへの期待がますます大きくなっている．琉球大学は創立時から「地域の発展に貢献する」ことをミッションとしてきたが，期待に応えるためにさらに様々な取組を強化する必要がある．そのための一環として，本学にリサーチアドミニストレーター（URA）が導入された．このURAが所属する研究企画室は，案件によって様々な部署と柔軟に連携を取ることによって，少人数でも効果的な活動を実現してきた．本稿では，4年近くにわたって進めてきた研究企画室の活動を，学内外セクターとの連携強化の試みに焦点を当てて紹介する．</p>
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分子系統樹を用いた分岐年代推定と生物多様化プロセス解析の概要

昆健志, 井上潤

化石 ( 日本古生物学会 ) 106 ( 0 ) 5 - 17 2019

Type of publication: Research paper (scientific journal)

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Understanding the process by which life diversifies is one of the central issues in biology. To clarify this process in focal taxa as well as to conduct phylogenetic analyses, a divergence time estimation —an important analysis to determine the timescale of a phylogenetic tree— must be performed. It is thought that the diversification process can be vividly reconstructed by estimating the diversification rate and ancestral geographic area, characterizing ancestral ecology, and mapping ancestral habitats according to a time-calibrated phylogenetic framework. Here we introduce a divergence time estimation method and various other methods for reconstructing the process of diversification based on the time-calibrated phylogenetic framework with some study examples of aquatic organisms, mainly fish.
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