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• 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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• 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)

  　View Summary

  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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• An outline of estimation of divergence time and diversification process based on the molecular phylogenetic tree

  Kon Takeshi, Inoue Jun

  Fossils ( Palaeontological Society of Japan )  106 ( 0 ) 5 - 17   2019.09  [Refereed]

   

  DOI CiNii Research

• 川と海を回遊するイーブーの起源:ハゼ亜目魚類における両側回遊の進化プロセス

  KON TAKESHI, NISHIDA MUTSUMI, SADO TETSUYA, MIYA MASAKI

  沖縄生物学会誌   ( 53 ) 121   2015.03

   

  J-GLOBAL

• ハゼ亜目における両側回遊の進化と多様化プロセス

  KON TAKESHI

  日本魚類学会年会講演要旨   47th   96   2014.11

   

  J-GLOBAL

• ハゼ亜目魚類多様化プロセスの概要

  KON TAKESHI, SADO TETSUYA, RUBER LUKAS, SATO TAKASHI, YOSHINO TETSUO, NISHIDA MUTSUMI, MIYA MASAKI

  日本魚類学会年会講演要旨   47th   45   2014.11

   

  J-GLOBAL

• 砂浜に潜むリュウキュウナミノコハゼのミトコンドリアDNAおよび核DNAに基づく分子系統解析

  KON TAKESHI, SAKAUE JIRO, SUZUKI TOSHIYUKI

  沖縄生物学会誌   ( 52 ) 98   2014.03

   

  J-GLOBAL

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• Grant-in-Aid for Scientific Research(C)

  Project Year: 2011  -  2014 

  Direct: 4,300,000 (YEN)  Overheads: 1,290,000 (YEN)  Total: 5,590,000 (YEN)

• Global patterns of diversification in the evolutionary history of the paedomorphic fish Schindleria (Gobioidei, Schindleriidae)

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2011  -  2013 

  Investigator(s): KON Takeshi 

  Direct: 4,300,000 (YEN)  Overheads: 5,590,000 (YEN)  Total: 1,290,000 (YEN)

  　View Summary

  The extremely paedomorphic fish Schindleria (Gobioidei, Schindleriidae) includes one of the smallest and youngest reproducing vertebrates and is broadly distributed in the Indo-Pacific Oceans inhabiting coral reef lagoons. This study aimed to elucidate the evolutionary process of this tiny fish, by applying whole mitochondrial DNA (mtDNA) and three nuclear DNA genes sequencing, supermatrix analysis, divergence time and speciation rate estimations, and its ancestral habitat reconstruction. My results suggested that Schindleria was diverged from Oxymetopon at 30 Mya. Phylorate plots for speciation using the gobioid phylogeny showed that the speciation rate of Schindleria was not higher acceleration than the mean rate of all gobioids.

• Hidden Diversity in Paedomorphosis : Analysis of Evolutionary Pattern of Coral Reef Fish Schindleria

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2008  -  2010 

  Investigator(s): Takeshi KON 

  Direct: 3,700,000 (YEN)  Overheads: 1,110,000 (YEN)  Total: 4,810,000 (YEN)

  　View Summary

  In the present project, I have obtained more than 1,500 Schindleria specimens from Hawaii, Palau, Indonesia, Thailand, and Okinawa. Molecular phylogenetic analysis detected five species in Palauan specimens and revealed four new cryptic species of the five ones. These four species were endemic to Palau, suggesting that the level of endemism is high in Schindleria. The resultant phylogenetic trees based on whole mitochondrial DNA sequences strongly supported that all Schindleria species are placed as sister group to Oxymetopon in Microdesmidae+Ptereleotridae.

• Hidden Diversity in Paedomorphosis : Analysis of Evolutionary Pattern of Coral Reef Fish Schindleria

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2008  -  2010 

  Investigator(s): Takeshi KON 

  Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

  　View Summary

  In the present project, I have obtained more than 1,500 Schindleria specimens from Hawaii, Palau, Indonesia, Thailand, and Okinawa. Molecular phylogenetic analysis detected five species in Palauan specimens and revealed four new cryptic species of the five ones. These four species were endemic to Palau, suggesting that the level of endemism is high in Schindleria. The resultant phylogenetic trees based on whole mitochondrial DNA sequences strongly supported that all Schindleria species are placed as sister group to Oxymetopon in Microdesmidae+Ptereleotridae.

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• 2024.01

  　

  　

  

• 2023.11

  　

  　

  

• 2023.10