An empirical study for clarifying roles of sexual selections in evolution of male traits of fiddler crabs using robots.

• Project/Area Number: 22570027
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Ecology/Environment
• Research Institution: Iwate Medical University
• Principal Investigator: MATSUMASA Masatoshi 岩手医科大学, 共通教育センター, 教授 (50219474)
• Co-Investigator(Kenkyū-buntansha): ASAMI Takahiro 信州大学, 理学部, 教授 (10222598) ; MURAI Minoru 琉球大学, 熱帯生物圏研究センター, 名誉教授 (80117267)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 行動生態 / 左右不相称 / 同性間淘汰 / 配偶者選択 / 性選択 / 同性間選択

Research Abstract

Field observations and experiments were conducted for fiddler crabs (genus Uca) with some comparisons in morphology of their chelae in order to clarify the effects of intra- and inter-sexual selections on evolutions of sexual ornaments and of the laterality. Although the experiments using robots that mimic courtship behaviors of crabs have been incomplete, we found that fights between hetero-claw males tend to last longer than those between homo-claw males in Uca lactea that exhibits developed social behaviors. The disagreement of this result for U. lactea with that for U. vomerisas well as difference in morphology of chelae between the species indicates that the mechanism for maintaining the laterality would differ between Uca species.

Research Products

• [Journal Article] A low-cost sexual ornament reliably signals male condition in the fiddler crab Uca beebei (2013)
  • Author(s): Matsumasa, M., Murai, M., Christy, J. H. (Matsumasa, M.)
  • Journal Title: Animal Behaviour Volume: 85 Issue: 6 Pages: 1335-1341
  • DOI: 10.1016/j.anbehav.2013.03.024
  • NAID: 120005944173
  • Peer Reviewed
• [Journal Article] Chiral speciation in terrestrial pulmonate snails (2012)
  • Author(s): Gittenberger, E., Hamann, T. D., Asami, T.
  • Journal Title: PLoS One Volume: 7 Issue: 4 Pages: e34005-e34005
  • DOI: 10.1371/journal.pone.0034005
  • NAID: 120007114329
  • Peer Reviewed
• [Journal Article] unctional constraints on coiling geometry and aperture inclination in gastropods. (2012)
  • Author(s): Noshita, K., Asami, T., Ubukata, T.
  • Journal Title: Paleobiology Volume: 38 Pages: 322-334
  • Peer Reviewed
• [Journal Article] Functional constraints on coiling geometry and aperture inclination in gastropods. (2012)
  • Author(s): Noshita, K., Asami, T., Ubukata, T. (Noshita, K.)
  • Journal Title: Paleobiology Volume: 38 Pages: 322-334
  • DOI: 10.5061/DRYAD.6MK023C0
  • Peer Reviewed
• [Journal Article] A low -cost sexual ornament reliably signals male condition in the fiddler crab Uca beebei
  • Author(s): Matsumasa, M., Murai, M., Christy, J. H.
  • Journal Title: Animal Behaviour
  • NAID: 120005944173
  • Peer Reviewed
• [Presentation] シオマネキの左右性と雄間闘争 (2012)
  • Author(s): 松政正俊・村井実・逸見泰久
  • Organizer: 日本甲殻類学会第50回大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2012-10-20
• [Presentation] ハクセンシオマネキの雌誘引シグナルbackground waving のコスト (2012)
  • Author(s): 村井実・逸見泰久・松政正俊
  • Organizer: 日本甲殻類学会第50回大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2012-10-20
• [Presentation] シオマネキの左右性と雄間闘争
  • Author(s): 松政正俊・村井実・逸見泰久（松政正俊）
  • Organizer: 日本甲殻類学会第50回大会
  • Place of Presentation: 熊本大学
• [Presentation] ハクセンシオマネキの雌誘引シグナル background waving のコスト
  • Author(s): 村井実・逸見泰久・松政正俊（村井実）
  • Organizer: 日本甲殻類学会第50回大会
  • Place of Presentation: 熊本大学