Conditions for the evolution of sexual cannibalism in simultaneously hermaphroditic animals

• Project/Area Number: 26440249
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Ecology/Environment
• Research Institution: Nihon University
• Principal Investigator: NAKAJIMA Yasuhiro 日本大学, 経済学部, 教授 (50295383)
• Co-Investigator(Kenkyū-buntansha): 後藤 慎介 大阪市立大学, 大学院理学研究科, 教授 (70347483)
• Research Collaborator: SEKIZAWA Ayami ; KOSOBA Keita
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 性的共食い / 同時雌雄同体 / 進化的安定戦略 / 配偶行動 / ウミウシ / キヌハダモドキ / 裸鰓類 / spiteful behavior

Outline of Final Research Achievements

Though sexual cannibalism, a phenomenon in which an animal preys on its sexual partner during mating, has hitherto been known only in gonochoristic terrestrial arthropods, we comfirmed the behavior in a simultaneously hermaphroditic marine gastropod, Gymnodoris citrina. In already-known instances, being preyed males increased their reproductive success by increasing the number of eggs of their mates. In G. citrina, both preyed and being preyed individuals did not increase their reproductive success. A mathematical examination showed sexual cannibalism has a possibility to evolve among simultaneouly hermaphroditic animals as a result of evolutionary arms race, and as an evolutionary stable strategy under a special condition. The specific feeding style of G. citrina fulfills this special condition, and that is the reason why sexual cannibalism has evolved only in this species.

Research Products

• [Journal Article] Biological differences between Chromodoris reticulata and Chromodoris tinctoria (Nudibranchia, Opisthobranchia). (2018)
  • Author(s): Sekizawa A., Yama R. and Nakashima Y.
  • Journal Title: Journal of the Malacological Society of Japan Volume: 76
  • Peer Reviewed
• [Presentation] Sexual Cannibalism as an ESS in a Simultaneously Hermaphroditic Nudibranch, Gymnodoris citrina. (2017)
  • Author(s): Nakashima Y., Kosoba K., Sekizawa A.
  • Organizer: 35th International Ethological Conference
  • Int'l Joint Research
• [Presentation] 同時雌雄同体のウミウシの一種キヌハダモドキにおける進化的安定戦略(ESS)としての性的共食い (2017)
  • Author(s): 中嶋康裕, 小蕎圭太, 関澤彩眞
  • Organizer: 日本動物学会第88回大会
• [Presentation] 同時雌雄同体キヌハダモドキの性的共食いは進化的安定戦略(ESS)だった (2017)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本動物行動学会第36回大会
• [Presentation] キヌハダモドキの性的共食いは進化的安定戦略(ESS)だった (2017)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本貝類学会平成29年度大会
• [Presentation] マイナスの協力は実在するのか~キヌハダモドキでの検証 (2016)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本動物行動学会第35回大会
  • Place of Presentation: 新潟大学五十嵐キャンパス, 新潟市西区
  • Year and Date: 2016-11-11
• [Presentation] Spiteful Sexual Cannibalism in a Simultaneously Hermaphroditic Nudibranch. (2016)
  • Author(s): Nakashima Y., Kosoba K., Sekizawa A.
  • Organizer: 16th International Behavioral Ecology Congress,
  • Place of Presentation: Exeter, UK.
  • Year and Date: 2016-07-28
  • Int'l Joint Research
• [Presentation] Development of Sexual Cannibalism in a Gymnodoris citrina (Nudibranchia Doridacea). (2016)
  • Author(s): Kosoba K., Sekizawa A., Nakashima Y.
  • Organizer: 19th International Congress of Malacology “Unity in Diversity”
  • Place of Presentation: Penang, Malaysia.
  • Year and Date: 2016-07-18
  • Int'l Joint Research
• [Presentation] A nudibranch removes allo-sperm and throws it away along with own thorny penis after copulation. (2016)
  • Author(s): Sekizawa A., Goto S., Nakashima Y.
  • Organizer: 19th International Congress of Malacology “Unity in Diversity”
  • Place of Presentation: Penang, Malaysia.
  • Year and Date: 2016-07-18
  • Int'l Joint Research
• [Presentation] キヌハダモドキの性的共食いは敵対行動(spiteful behavior)なのか？ (2016)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本貝類学会平成28年度大会
  • Place of Presentation: 東邦大学理学部(習志野キャンパス), 千葉県船橋市,
  • Year and Date: 2016-04-16
• [Presentation] キヌハダモドキの性的共食いは敵対行動(spiteful behavior)なのか？ (2016)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本貝類学会平成28年度大会
  • Place of Presentation: 東邦大学理学部（習志野キャンパス）
  • Year and Date: 2016-04-16
• [Presentation] 同時雌雄同体キヌハダモドキの性的共食いはいじわる行動の３例目か？ (2015)
  • Author(s): 小蕎圭太, 須之部友基, 関澤彩眞, 中嶋康裕
  • Organizer: 日本動物行動学会第34回大会
  • Place of Presentation: 東京海洋大学品川キャンパス
  • Year and Date: 2015-11-20
• [Presentation] 同時雌雄同体のキヌハダモドキにおける性的共食い (2015)
  • Author(s): 中嶋康裕, 小蕎圭太, 関澤彩眞
  • Organizer: 日本動物学会第86回大会
  • Place of Presentation: 新潟コンベンションセンター
  • Year and Date: 2015-09-17
• [Presentation] キヌハダモドキにおける性的共食いの発達 (2015)
  • Author(s): 中嶋康裕、小蕎圭太、関澤彩眞
  • Organizer: 平成27年度日本貝類学会大会
  • Place of Presentation: 蘭越町山村開発センター・北海道蘭越町
  • Year and Date: 2015-05-23 – 2015-05-24
• [Presentation] キヌハダモドキにおける性的共食いの発達 (2015)
  • Author(s): 中嶋康裕, 小蕎圭太, 関澤彩眞
  • Organizer: 日本貝類学会平成27年度大会
  • Place of Presentation: 北海道蘭越町山村開発センター
  • Year and Date: 2015-05-23
• [Presentation] 食われる前に食え：キヌハダモドキ（ウミウシ）の性的共食い (2014)
  • Author(s): 中嶋康裕, 小蕎圭太, 関澤彩眞
  • Organizer: 日本動物行動学会第33回大会ラウンドテーブル
  • Place of Presentation: 長崎大学文教キャンパス・長崎市
  • Year and Date: 2014-11-01 – 2014-11-03
• [Presentation] キヌハダモドキの性的共食いの発達 (2014)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本動物行動学会第33回大会
  • Place of Presentation: 長崎大学文教キャンパス・長崎市
  • Year and Date: 2014-11-01 – 2014-11-03
• [Presentation] キヌハダモドキの性的共食い (2014)
  • Author(s): 小蕎圭太, 関澤彩眞, 中嶋康裕
  • Organizer: 日本貝類学会平成26年度大会
  • Place of Presentation: 大阪市立自然史博物館・大阪市
  • Year and Date: 2014-04-12 – 2014-04-13
• [Book] 貝のストーリー ～「貝的生活」をめぐる７つの謎解き (2016)
  • Author(s): 中嶋康裕
  • Total Pages: 242
  • Publisher: 東海大学出版部
• [Book] 貝のストーリー～「貝的生活」をめぐる７つの謎解き (2016)
  • Author(s): 中嶋康裕（編著）
  • Total Pages: 242
  • Publisher: 東海大学出版部
• [Book] 岩波科学ライブラリー240 うれし、たのし、ウミウシ。 (2015)
  • Author(s): 中嶋康裕
  • Total Pages: 144
  • Publisher: 岩波書店