Updated on 2024/01/29

写真a

 
OKUZAKI YUTAKA
 
Organization
Faculty of Liberal Arts, Sciences and Global Education Associate Professor
Title
Associate Professor
Affiliation
Institute of Liberal Arts, Sciences and Global Education

Position

  • Faculty of Liberal Arts, Sciences and Global Education 

    Associate Professor  2023.04 - Now

Degree

  • 博士(理学) ( Kyoto University )

  • 修士(理学) ( Kyoto University )

  • 学士(理学) ( Kyoto University )

Professional Memberships

  • 日本動物行動学会

    2021 - Now

  • 個体群生態学会

    2016 - Now

  • 日本昆虫学会

    2011 - Now

  • 日本生態学会

    2007 - Now

Awards

  • 個体群生態学会奨励賞

    奥崎 穣

    2019.09   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

Job Career (off-campus)

  • Osaka Metropolitan University   Faculty of Liberal Arts, Sciences and Global Education

    2023.04 - Now

  • The University of Tokyo   Graduate School of Arts and Sciences

    2020.04 - 2023.03

  • 東海大学   非常勤講師

    2019.04 - 2020.03

  • Hokkaido University   Field Science Center for Northern Biosphere Forest Research Station

    2017.08 - 2020.03

Papers

  • 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   2023.05( ISSN:1055-7903

     More details

    Publishing type:Research paper (scientific journal)  

    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   2022.07( ISSN:0287-3478

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.18353/crustacea.51.0_39

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

    Yutaka Okuzaki

    Evolution   75 ( 9 )   2269 - 2285   2021.07

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/evo.14302

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

    Koji Sasakawa, Oleg Berlov, Yutaka Okuzaki

    ZOOTAXA   4822 ( 3 )   416 - 424   2020.08( ISSN:1175-5326

     More details

    Publishing type:Research paper (scientific journal)  

    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 Reviewed

    Okuzaki, Yutaka, Nakamura, Shoko, Nakaoka, Masahiro

    ECOLOGICAL RESEARCH   34 ( 5 )   563 - 574   2019.09( ISSN:0912-3814

     More details

    Publishing type:Research paper (scientific journal)  

    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

  • Mechanism of sexual trait diversification independent of environmental effects: changes in male mating tactics due to body size divergence

    奥崎穣

    タクサ   52   2022( ISSN:1342-2367

     More details

  • 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   2020.03

  • 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

  • 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( ISSN:0023-3218

     More details

Charge of off-campus class subject

  • 全学自由研究ゼミナール

    2021.04
    -
    Now

  • 複合系計画論

    2021.04
    -
    Now

  • 生物社会学I

    2021.04
    -
    Now

  • Biodiversity and Ecosystems

    2020.04
    -
    Now
    Institution:The University of Tokyo, Graduate School of Arts and Sciences

  • 自然科学ゼミナール(生命科学)

    2020.04
    -
    Now

  • 生物圏・地球圏システム科学実験

    2020.04
    -
    Now

  • 生態学

    2020.04
    -
    Now

  • 生態・進化学I

    2020.04
    -
    Now

  • 広域システム概論II

    2020.04
    -
    Now

  • 北海道の野生生物

    2019.04
    -
    2020.03
    Institution:Tokai University

  • 公開森林実習

    2017.08
    -
    2020.03

  • 森林フィールド講座

    2017.08
    -
    2020.03

▼display all