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Adaptive strategies in reproduction to be a simultaneous hermaphrodite

Research Project

Project/Area Number 13640630
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionNihon University, College of Economics (2003)
Miyagi University (2001-2002)

Principal Investigator

NAKASHIMA Yasuhiro  Nihon University, College of Economics, Professor, 経済学部, 教授 (50295383)

Co-Investigator(Kenkyū-buntansha) KUWAMURA Tetsuo  Chukyo University, Faculty of Liberal Arts, Professor, 教養部, 教授 (00139974)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsHermaphroditism / Sex change / Protogyny / Reproductive strategy / Sex allocation / Mating behavior / Mating system / Sexual conflict / ミツボシキュウセン / サラサウミウシ / 同時雌雄同体 / 交尾拒否 / 一次雄 / 一夫多妻 / 代替繁殖戦術 / ツマジロモンガラ / アカニジベラ
Research Abstract

At the beginning of this research, we predicted that protogynous labrid fishes could perform bi-sexual mating behavior, that is court as a male and also as a female, only for a few days in the period of sex change, and afterward they would behave only as the sex they changed to. Contrary to the first prediction, we found that Halichoeres margaritaceus performed bi-sexual mating behavior longer than a week in the course of research in 2001. But we could not observe mating behavior in the field after2001 reproductive season, because the water clearance badly diminished owing to the erosion of the soil. So we enlarged our research theme to the flexibility of the reproductive behavior in the males of labrid fishes. As a result, we found an initial phase male of H. trimaculatus changed its sex into female in the field in 2003. This shows the sex allocation of sex changing fishes are surprisingly high. Further, we found that initial phase males of H. trimaculatus used three types of reproduc … More tive strategies, sneaking, streaking, and group spawning according to their circumstances.
The population of Onchidium verruculatum, another research object, diminished on a large scale because of extraordinarily high tide occurred at Okinawan coast successively. As a result, we could not found enough number of individuals for observation in 2001. In 2003, although the overall number recovered to usual level, mature individuals were not enough for effective observation. So we decided to change study animals to nudibranchs. Although nudibranchs are simultaneous hermaphrodite as well as Onchidium, they take both male and female role simultaneously in each copulation. On the other hand, Onchidium acts as a male or a female in each mating occasion. We found a characteristic rejection to copulation in individuals of Chromodoris tinctoria that have already copulated. This is contrary to the prediction that hermaphroditic animals with internal fertilization prefer to take female role in reproduction, because they can use received sperm not only for fertilization but also as a nutrient. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Kuwamura T., Tanaka N., Nakashima Y., Karino K., Sakai Y.: "Reversed sex-change in the protogynous reef fish Labroides dimidiatus"Ethology. 108. 443-450 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sakai Y., Karino K., Nakashima Y., Kuwamura T.: "Status-dependent behavioural sex change in a polygynous coral-reef fish, Halichoeres melanurus"Journal of Ethology. 20. 101-105 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sakai Y., Karino K., Kuwamura T., Nakashima Y., Maruo Y.: "Sexually dichromatic protogynous angelfish Centropyge ferrugata (Pomacanthidae) males can change back to females."Zoological Science. 20(5). 627-633 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takamoto G., Seki S., Nakashima Y., Karino K., Kuwamura T.: "Protogynous sex change in the haremic triggerfish Sufflamen chrysopterus (Tetraodontiformes)."Ichthyological Research. 50(3). 281-283 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Kuwamura, T., Tanaka, N., Nakashima, Y., Karino, K., Sakai, Y.: "Reverse sex-change in the protogynous reef fish, Labroides dimidiatus."Etholog. 108. 443-450 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sakai, Y., Karino, K., Nakashima, Y., Kuwamura, T.: "Status-dependent behavioral sex change by the largest females in a polygynous coral-reef fish, Halichoeres melanurus."Journal of Ethology. 20. 101-105 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sakai, Y., Karino, K., Kuwamura, T., Nakashima, Y., Maruo Y.: "Sexually dichromatic protogynous angelfish Centropyge ferrugata (Pomacanthidae) males can change back to females."Zoological Science. 20(5). 627-633 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takamoto, G., Seki, S., Nakashima, Y., Karino, K., Kuwamura, T.: "Protogynous sex change in the haremic triggerfish Sufflamen chrysopterus (Tetraodontiformes)."Ichthyo-logical Research. 50(3). 281-283 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sakai Y., Karino K., Kuwamura T., Nakashima Y., Maruo Y.: "Sexually dichromatic protogynous angelfish Centropyge ferrugata (Pomacanthidae) males can change back to females."Zoological Science. 20(5). 627-633 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takamoto G., Seki S., Nakashima Y., Karino K., Kuwamura T.: "Protogynous sex change in the haremic triggerfish Sufflamen chrysopterus (Tetradontiformes)."Ichthyological Research. 50(3). 281-283 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 中嶋康裕, 狩野賢司(編): "魚類の社会行動2"海游舎. 210 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sakai Y., Karino K., Kuwamura T., Nakashima Y., Maruo Y.: "Sexually dichromatic protogynous angelfish Centropyge ferrugata (Pomacanthidae) males can change back to females"Zoological Science. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Takamoto G., Seki S., Nakashima Y., Karino K., Kuwamura T.: "Protogynous sex change in the haremic triggerfish Sufflamen chrysopterus (Tetraodontiformes)"Ichthyological Research. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kuwamura T., Tanaka N., Nakashima Y., Karino K., Sakai Y: "Reverse sex-change in the protogynous reef fish, Labroides dimidiatus"Ethology. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Sakai Y., Karino K., Nakashima Y., Kuwamura T.: "Status-dependent behavioural sex change in a polygynous coral-reef fish, Halichoeres melanurus"Journal of Ethology. (in press). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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