2024/01/29 更新

写真a

オクザキ ユタカ
奥崎 穣
OKUZAKI YUTAKA
担当
国際基幹教育機構 准教授
職名
准教授
所属
国際基幹教育研究院

担当・職階

  • 国際基幹教育機構 

    准教授  2023年04月 - 継続中

取得学位

  • 博士(理学) ( 京都大学 )

  • 修士(理学) ( 京都大学 )

  • 学士(理学) ( 京都大学 )

所属学協会

  • 日本動物行動学会

    2021年 - 継続中

  • 個体群生態学会

    2016年 - 継続中

  • 日本昆虫学会

    2011年 - 継続中

  • 日本生態学会

    2007年 - 継続中

受賞歴

  • 個体群生態学会奨励賞

    奥崎 穣

    2019年09月   個体群生態学会   ミミズ食オサムシの群集依存的な体サイズ分化

職務経歴(学外)

  • 大阪公立大学   国際基幹教育機構

    2023年04月 - 継続中

  • 東京大学   大学院総合文化研究科

    2020年04月 - 2023年03月

  • 東海大学   非常勤講師

    2019年04月 - 2020年03月

  • 北海道大学   北方生物圏フィールド科学センター 森林圏ステーション   学術研究員

    2017年08月 - 2020年03月

論文

  • Origin and diversification of pheretimoid megascolecid earthworms in the Japanese Archipelago as revealed by mitogenomic phylogenetics

    Chika Sato, Noriko Nendai, Nobuaki Nagata, Yutaka Okuzaki, Hiroshi Ikeda, Yukio Minamiya, Teiji Sota

    Molecular Phylogenetics and Evolution   182   2023年05月( ISSN:1055-7903

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    掲載種別:研究論文(学術雑誌)  

    Megascolecid earthworms of the pheretimoid group are dominant detritivores of soil ecosystems in the Japanese Archipelago and East Asia. However, their diversity and phylogenetic relationships are poorly understood. We assembled whole mitogenome sequences for 197 megascolecid earthworms collected throughout Japan to study the phylogenetic relationships, phylogeography, divergence times, and diversification of important morphological characteristics among pheretimoid earthworms. Using 197 mitogenome sequences and 24 published mitogenome sequences from the East Asian mainland (221 sequences in total), we constructed a maximum likelihood tree and found that the pheretimoid earthworms currently assigned to Amynthas, Metaphire, Duplodicodrilus, and Manus are involved in the most senior genus Amynthas; thus, Amynthas can be treated as the sole genus encompassing all of the above genera. Within the Amynthas group, we identified three major lineages that led to four groups of endemic species in Japan. These lineages originated from different lineages on the East Asian mainland and Taiwan Island, indicating multiple colonization events from the East Asian mainland by different ancestral lineages, possibly after the Miocene. We also assembled nuclear ribosomal DNA sequences encompassing the 18S to 28S rRNA genes. The nuclear gene tree showed major groups consistent with the mitogenome tree except for different (and not well-resolved) relationships among major clades. Our molecular data covered 115–158 native and 7 non-native Amynthas group species in Japan in terms of DNA-based species delimitation. Our findings provide a basis for understanding the evolutionary relationships among diversified megascolecid earthworms in the Amynthas group in Japan and adjacent regions.

    DOI: 10.1016/j.ympev.2023.107735

  • First specimen-based record of the freshwater crab <i>Geothelphusa</i> <i>dehaani</i> (White, 1847) (Decapoda: Brachyura: Potamidae) in Hokkaido, northern Japan

    Ryohei Sugime, Yutaka Okuzaki, Katsumi Furuse, Osamu Kishida, Tohru Naruse

    Crustacean Research   51   39 - 45   2022年07月( ISSN:0287-3478

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.18353/crustacea.51.0_39

  • Effects of body size divergence on male mating tactics in the ground beetle Carabus japonicus 査読

    Yutaka Okuzaki

    Evolution   75 ( 9 )   2269 - 2285   2021年07月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1111/evo.14302

  • Taxonomic and nomenclatural changes in three species of Pterostichus Bonelli (Coleoptera: Carabidae) from the Far East 査読

    Koji Sasakawa, Oleg Berlov, Yutaka Okuzaki

    ZOOTAXA   4822 ( 3 )   416 - 424   2020年08月( ISSN:1175-5326

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    掲載種別:研究論文(学術雑誌)  

    The ground beetle genus Pterostichus Bonelli has diversified in regions including the Far East, but taxonomic issues remain even at the species level. This study presents taxonomic and nomenclatural changes in three species of Pterostichus from the Far East: P. (Petrophilus) eximius Morawitz, P. (Lenapterus) wellschmiedi Kirschenhofer, and P. (L.) subrugosus Straneo. The analyses are based on comparative studies of the endophallus of male genitalia, which is taxonomically useful in Carabidae but has not been examined in these species. The first species, P. eximius, has been treated as a monotypic species that is widely distributed in Eastern Siberia, the Russian Far East, and adjacent regions, but our results revealed that populations from Rishiri-to and the Sakhalin islands are distinct from the nominotypical population from Transbaikalia. The name for the Sakhalin population, which was synonymized with P. eximius, is reinstated as subspecies P. eximius sachalinensis stat. nov., and the Rishiri-to population is described as Pterostichus eximius rishiridakensis ssp. nov. Conspecificity (syn. nov.) was confirmed for P. wellschmiedi, which was described from southern Sakhalin, and P. marginatus Matsumura, which was described earlier from southern Sakhalin. No conspicuous differences in the endophallus structure were found between P. subrugosus, which was described from Hokkaido, and P. marginatus, although differences are recognized in the elytral sculptures and in the metallic luster of the dorsal surface. The taxon was thus downgraded to subspecies P. marginatus subrugosus stat. nov.

    DOI: 10.11646/zootaxa.4822.3.6

  • Toward more rapid and efficient peer review: A case study on publication in Ecological Research 査読

    Okuzaki, Yutaka, Nakamura, Shoko, Nakaoka, Masahiro

    ECOLOGICAL RESEARCH   34 ( 5 )   563 - 574   2019年09月( ISSN:0912-3814

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    掲載種別:研究論文(学術雑誌)  

    The peer-review system ensures the reliability of academic publication. However, authors may be unsatisfied with the duration of peer-review and/or the reviewers' comments, whereas both reviewers and editors have many concerns over peer-reviewing. To provide information to increase the efficiency of the peer-review process for authors, reviewers and editors, we analyzed recent trends in publication and peer-review processes in Ecological Research, and asked Editorial Board members to answer an online questionnaire. The acceptance rate of Original Articles, which accounted for 89.2% of all submissions, was 20.1%, whereas those of Special Features, Data Papers, and Technical Reports were 76.3, 73.7 and 38.3%, respectively. The median number of days to final decision was 168 for accepted manuscripts. The stage when handling editors invited reviewers to review was the longest stage during the peer-review process. This stage was prolonged when potential reviewers declined the invitations to review. The results of the questionnaire revealed that both editors and reviewers felt burdened by the load of peer-reviewing. Most editors encountered declining of peer-review invitations. As the period of assigning reviewers is the most important step in determining the number of days to the final decision, the editorial office should support handling editors to locate reviewers. Motivating reviewers to review manuscripts is another way to speed up the process. Since many respondents indicated that improvements in the logical structure and English standard of manuscripts would facilitate review, authors could improve the process by carefully preparing their manuscripts with consideration to readers, including voluntary reviewers and editors.

    DOI: 10.1111/1440-1703.12037

MISC(その他記事)

  • 環境の影響を受けにくい性的形質の多様化メカニズム:体サイズ分化によるオスの交尾戦略の変化

    奥崎穣

    タクサ   52   2022年( ISSN:1342-2367

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  • On the species identities of the Pterostichus thunbergi species group (Coleoptera: Carabidae) from the alpine zones of Rishiri-tô Island and the Daisetsuzan Mountains, Hokkaidô, northern Japan

    Koji Sasakawa, Yutaka Okuzaki

    Bulletin of the Faculty of Education, Chiba University   68   365 - 368   2020年03月

  • 利尻山山頂からのキタオカトビムシ(節足動物門:甲殻亜門:端脚目)の記録

    富川 光, 奥崎 穣

    利尻研究   39   23 - 25   2020年

  • 気温,近縁種,餌サイズが影響するヒメオサムシの大きさ

    奥崎穣

    昆虫と自然   54 ( 5 )   2019年( ISSN:0023-3218

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学外での担当授業科目

  • 全学自由研究ゼミナール

    2021年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 生物社会学I

    2021年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 複合系計画論

    2021年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • Biodiversity and Ecosystems

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 広域システム概論II

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 生態・進化学I

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 自然科学ゼミナール(生命科学)

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 生物圏・地球圏システム科学実験

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 生態学

    2020年04月
    -
    継続中
    機関名:東京大学大学院総合文化研究科

  • 北海道の野生生物

    2019年04月
    -
    2020年03月
    機関名:東海大学

  • 公開森林実習

    2017年08月
    -
    2020年03月
    機関名:北海道大学北方生物圏フィールド科学センター

  • 森林フィールド講座

    2017年08月
    -
    2020年03月
    機関名:北海道大学北方生物圏フィールド科学センター

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