Yukihiko Tokunaga(Toquenaga)

Yukihiko Tokunaga(Toquenaga)
Yukihiko Tokunaga(Toquenaga)
Tokunaga(Toquenaga)
Yukihiko

Affiliations

Office

  • Room: 総合研究棟A411

Links

University of TsukubaUniversity Logo1973+81.29.853.2111JPTsukubaIbaraki305-85771-1-1 Tennodai

I am an associate professor in the Doctoral Program in Biological Sciences at the University of Tsukuba, where I teach ecology, theoretical biology, biometry, and computer programming. I specialize in population biology using a wide range of materials, including natural communities of egrets and herons in the eastern region of the Kanto Plain; laboratory populations of bean weevils collected from all over the world; natural populations of bumble bees in urban and rural regions, and the in silico digital bugs that occupy gigabytes on the hard disks attached to my computers. I am using these materials to question, in an evolutionary sense, why some organisms live in groups but others tend to live solitarily. My speciation philosophy was converted to Wrightian from Fisherian when I studied evolution and ecology under Prof. Michael Wade in 1995–1996. I believe that Wright’s shifting balance scheme is realistic. I’m often described as a theoretician, but I consider myself primarily to be an ecological field worker. Somehow I have become good at capturing wild egrets and herons by hand!

The photographs (clockwise from the top left panel) show a larva of Callosobruchus maculatus, a notorious bean-weevil pest of legume seeds, constructing a rough wall inside a bean when it happened to break into the cavity of another larva. The larva has used feces and a secreted substance to form the wall. The C. maculatus larvae are of the scramble type, so multiple adults can emerge from a bean, but if the wall structure is artificially removed the larva will fight with the other larva in the cavity and one or both of them will die as a result. The rough wall acts as a kind of language that prevents fights between inherently quarrelsome larvae.

Research fields

Ecology/Environment

Research projects

集合知がもたらすサギ類群集の時空間分布についての研究 2014 -- 2016 徳永 幸彦 Japan Society for the Promotion of Science/基盤研究(C) 4940000
地理的スケールにおける生物多様性の動態と保全に関する研究 1999-04 -- 2001-03 椿宜高 農業研究センター病害虫防除部鳥害研究室/国内共同研究
受粉用マルハナバチの逃亡防止技術と生態リスク管理技術の開発 2005-07 -- 2006-03 五箇公一 国立環境研究所・主任研究員/国内共同研究
Population Ecology of Bumblebees 2005-04 -- 2008-03 /
Application of artitiual life in ecology -- (current) /
Population dynamics and behavioral ecology using laboratory population of bean weevils -- (current) /
コスモポリタンを使った種の壁の操作実験 2011 -- 2013 Japan Society of for the Promotion of Science/基盤研究(C) 3900000
サギ類コロニー・集団塒の形成要因としての歴史性についての研究 2007 -- 2009 Japan Society of for the Promotion of Science/基盤研究(C) 4420000
ユーラシア大陸におけるマルハナバチ群集の営巣行動と遺伝的多様についての研究    2005 -- 2007 Japan Society of for the Promotion of Science/基盤研究(B) 5330000
真の系統樹を用いたマメゾウムシ実験個体群の競争様式の系統間比較   2005 -- 2006 Japan Society of for the Promotion of Science/基盤研究(C) 3000000

Career history

1994-08 -- 1997-02 University of Tsukuba Institute of Biological Sciences Research Assistant
1997-03 -- 2001-03 University of Tsukuba Institute of Biological Sciences Assistant Professor
2001-04 -- 2003-10 University of Tsukuba Division of Integrative Environmental Sciences Assistant Professor
2003-11 -- (current) University of Tsukuba Division of Integrative Environmental Sciences Assosiate Professor
2007-04 -- (current) 筑波大学 大学院生命環境科学研究科生命共存科学専攻&#8226 准教授

Academic background

-- 1986 University of Tsukuba Second Cluster of College 生物学類
-- 1991 University of Tsukuba Graduate School, Division of Bioresearch 生物学

Degree

1991-03 Doctor of Science University of Tsukuba
1988-03 Master of Science University of Tsukuba

Academic societies

-- (current) The Society of Population Ecology
-- (current) ECOLOGICAL SOCIETY OF JAPAN
-- (current) Japan Ethological Society
2007 -- (current) American Society of Naturalists
2008 -- (current) Ecological Society of America
-- (current) Society for the Study of Evolution

Articles

  • 東アジアにおけるアマサギ2個 体を対象とした長距離移動 衛星追跡
    TOKUNAGA(TOQUENAGA) Yukihiko
    日本鳥学会誌/66(2), 2017-10
  • Melanic mutation causes a fitness decline in bean beetles infected by Wolbachia
    Numajiri Yuko; Kondo Natsuko I.; TOKUNAGA(TOQUENAGA) Yuki...
    Entomologia Experimentalis et Applicata/164(1)/pp.54-65, 2017
  • Balance between site fidelity and habitat preferences in colony site selection by herons and egrets
    Carrasco Luis; TOKUNAGA(TOQUENAGA) Yukihiko; Mashiko Miyuki
    J. Avian Biol./48(7)/pp.965-975, 2017-05
  • Geographical variation in the heterogeneity of mutualistic networks
    Sakai Shoko; Metelmann Soeren; TOKUNAGA(TOQUENAGA) Yukihi...
    Open Science/3(6)/p.150630, 2016-06
  • Larval competition causes the difference in male ejaculate expenditure in Callosobruchus maculatus
    Masako Katsuki; TOKUNAGA(TOQUENAGA) Yukihiko; Takahisa Mi...
    Population Ecology/55(3)/pp.493-498, 2013-07
  • 相変異と悪魔
    徳永幸彦
    遺伝/61(5)/pp.108-111, 2007-01
  • ゲノム時代の人工生命~プレイグランドで遊びましょう~
    徳永幸彦; 原田肇
    生物科学/54(2)/pp.101-110, 2003-01
  • 多様性の解釈学
    徳永幸彦
    日本の科学と技術/35/pp.28-31, 1994-01
  • 人工生命から見た集団
    徳永幸彦
    個体群生態学会会報 /51/pp.13-19, 1994-06
  • Heronry watching
    徳永幸彦
    日本の生物/5(5)/pp.24-29, 1991-05
  • ダーウィンと現代生態学~「こんがらがった土手」を繙くには?~
    徳永幸彦
    遺伝/62(5)/pp.41-44, 2008-01
  • 実験系での共存
    徳永幸彦
    週刊朝日百科動物たちの地球/142/p.309, 1994-01
  • 進化生態学的人工生命の使い方~r-K選択の舞台裏~
    徳永幸彦
    SHINKA /7(1)/pp.5-12, 1997-01
  • 今西近似:「生物世界」周りのテーラー展開として
    徳永幸彦
    生物科学/54(2)/pp.101-110, 2006-01
  • 人工生命の作り方
    徳永幸彦
    SHINKA/3(2)/pp.69-74, 1993-01
  • 人工生命の現在・過去・未来
    徳永幸彦
    遺伝/48/pp.12-21, 1994-01
  • 生態系と人工生命
    徳永幸彦
    電子情報通信学会誌/77/pp.135-142, 1994-01
  • Contest and scramble competitions in two bruchild species, Callosobruchus analis and C. phaseoli (Coleoptera : Bruchidae) : I. Larval competition curves and interference mechanisms
    Y. Toquenaga; K. Fujii; +徳永 幸彦
    Researches on Population Ecology, 32 : 349-363/32/p.2, 1990-01
  • D-Catechin : An oviposition stimulant of azuki bean weevil Callosobruchus chinensis from the host azuki bean
    T. Ueno; Y. Kuwahara; K. Fujii; Y. Toquenaga; T. Suzuki; ...
    Journal of Pesticide Sciences 15 : 573-578/15/p.4, 1990-01
  • Contest and scramble competitions in Callosobruchus maculatus (Coleoptera : Bruchidae) : I. Larval competition curves and resource sharing patterns
    Y. Toquenaga. K. Fujii; +徳永 幸彦
    Researches on Population Ecology, 33 : 199-211/33/p.2, 1991-01
  • Contest and scramble competitions in two bruchild species, Callosobruchus analis and C. phaseoli (Coleoptera : Bruchidae) : III. Multiple-generation competition experiment
    Y. Toquenaga. K. Fujii; +徳永 幸彦
    Researches on Population Ecology, 33 : 187-197/33/p.2, 1991-01
  • Contest and scramble competitions in two bruchid species, Callosobruchus analis and C. phaseoli(Coleoptera : Bruchidae) : II. Larval competition experiment
    Y. Toquenaga; K. Fujii; +徳永 幸彦
    Research on Population Ecology, 33 : 129-139/33/p.1, 1991-01
  • Contest and scramble competitions in Callosobrichus maculatus(Coleoptera : Bruchidae) II. Larvel competition and interfereme mechanisms
    Y. Toquenaga
    Researches on Popultion Ecology/35(1)/p.57-68, 1993-01
  • Contest and scramble competition in an artifical World : Genetic analysis with genetic algorithms
    Y. Toquenaga; M. Ichinose; T. Hoshino; K. Fujii; +徳永 幸彦
    in Langter, (G led. )Artificial Life III, Addison-Wesley/p.177-200, 1994-01
  • A-diversity : Stepping up food webs
    T. Saruwatari; Y. Toquenaga; T. Hoshino; +徳永 幸彦
    Arfiticial Life IV, MIT press/p.424-429, 1994-01

Books

  • An Experimental Study of Contest and Scramble Competitions
    徳永 幸彦
    1991-03
  • Contest and Scramble Competitions in Callosobruchus species (Coleoptera: Bruchidae)
    徳永 幸彦
    1991-03
  • The mechanisms of contest and scramble competition in Bruchid species, Bruchids and legumes pp. 341-349
    Y. Toquenaga
    1990-01
  • Mode of competition and interspecific competitive outcomes
    K. Fujii; Y. Toquenaga; +徳永 幸彦
    Mutualism and Community Organization/pp.178-198, 1993-01
  • 生きモノと生きコト in 人工生命の美学, 62-68
    徳永幸彦
    1994-02
  • 白鷺は群れるか?
    梶谷勇 ; 徳永幸彦 ;
    人工生命の夢と悩み/pp.38-47, 1994-08
  • 食うか食われるかの世界はいつかは絶滅するか?
    猿渡卓也 ; 徳永幸彦 ;
    人工生命の夢と悩み/pp.98-110, 1994-08
  • ギフチョウ旅行
    徳永幸彦
    はじめてのえころじい/pp.37-79, 1995-01
  • 絵でわかる進化論
    徳永幸彦 ;
    2001-01
  • Niche construction: the neglected process in evolution
    佐倉統監修; 山下篤子; 徳永幸彦 訳; +徳永 幸彦
    2007-01

Conference, etc.

  • Statistics and population ecology
    TOKUNAGA(TOQUENAGA) Yukihiko
    30th annual meeting of the society of population ecology/2014-10-10--2014-10-12
  • Impact of climate change on waterbird populations
    TOKUNAGA(TOQUENAGA) Yukihiko
    Workshop: The impact of climate changes on animal populations/2015-11-09--2015-11-14

Teaching

2017-04 -- 2017-09 山岳科学セミナーIIA University of Tsukuba.
2017-10 -- 2018-03 Thesis Research in Ecology II University of Tsukuba.
2017-04 -- 2017-07 Thesis Research in Biology of Organism Diversity (I) University of Tsukuba.
2017-10 -- 2018-02 Seminar on Ecology BII University of Tsukuba.
2017-10 -- 2018-03 山岳科学セミナーIIB University of Tsukuba.
2017-10 -- 2018-03 山岳科学研究IIB University of Tsukuba.
2017-11 -- 2018-02 Seminar on Biology of Organism Diversity E (III) University of Tsukuba.
2017-11 -- 2018-02 "Fundamental Biology, Laboratory III" University of Tsukuba.
2017-04 -- 2017-08 "Fundamental Biology, Laboratory I" University of Tsukuba.
2017-04 -- 2017-08 Seminar on Ecology EI University of Tsukuba.

Professional activities

1997 -- 1998 The Society of Population Ecology Secretary General