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Control of egg hatching in the terrestrial crab

Research Project

Project/Area Number 02640582
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 動物形態・分類学
Research InstitutionCollege of Liberal Arts and Science, Okayama University

Principal Investigator

SAIGUSA Masayuki  Okayama University, College of Liberal Arts & Sciences(Associate Professor), 教養部, 助教授 (80135962)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
KeywordsEgg hatching / Hatching synchrony / Endogenous rhythm / Transplantation / Female-attached eggs / Detached eggs / Hatching process / Induction of hatching / 甲殼類(アカテガニ) / 潮汐リズム / 卵の交換移殖 / 孵化誘導機構 / 物理的刺激 / 幼生孵化 / 卵殻の物理的破壊 / 卵塊の移殖 / 孵化過程の開始 / 物理的または化学的因子
Research Abstract

Embryos of the estuarine terrestrial crab Sesarma haematocheir hatch simultaneously just before they are released into water. Egg hatching occurs synchronously when the embryos are attached to a female, and the role of the female in this synchrony has been investigated. Clusters of embryos(each 200-2000 berries)were detached from the ovigerous females, and their hatching was compared with that of embryos attached to the females. Of the detached embryos in a cluster, either all hatched, or none hatched. Moreover, a remarkable feature was that the success of hatching in these detached eggs depended upon the time of hatching of the eggs still attached to the female. Clusters of embryos that were detached from the female within 48-49.5 h of the projected time of larval release, all hatched successfully, and swimming zoeae appeared. But embryos that were detached from the female for longer time periods did not hatch at all, though they were obviously alive. These results suggest that the pr … More esence of a hatching process different from embryonic development. The female would trigger this process.
Furthermore, to investigate which of female and embryo controls the actual timing of hatching, a cluster of embryos was detached and exchanged between two ovigerous females. Hatching of the transplanted eggs were divided into three patterns according to the number of nights until either or both of the females released larvae. In the Pattern I, transplanted clusters independently hatched from the eggs attached to the host female. In the Pattern II, while one of the implanted cluster was not controlled by the host female, hatching of another transplanted clusters was obviously induced. In the Pattern III, not only induction of hatching but also the time of hatching was controlled by the female. Hatching profiles of the transplanted eggs transferred into aerated conditions indicate that hatching requires three nights, and that each embryo also has an endogenous component for hatching. Since hatching of female-attached eggs occurs in a very short time, the female must have some action to enhance hatching synchrony when the actual hatching occurs. A plausible hypothesis to explain the mechanism as the induction and synchronization of hatching in each clutch is discussed. Less

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Masayuki SAIGUSA: "Phase shift of a tidal rhythm by light-dark cycles in the semi-terrestrial crab,Sesarma pictum" Biological Bulletin(USA). April. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masayuki SAIGUSA: "Observations of egg hatching in the terrestrial crab Sesarma haematocheir" Pacific Science(USA). July. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuarine terrestrial crab.I.Hatching of the eggs detached from the female" Biological Bulletin(USA). June. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuasrine terrestrial crab II.Exchange of a cluster of embryos between two females" Biological Bulletin(USA).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuarine terrestrial crab III.Influence of temperature on the hatching"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tadashi AKIYAMA Masayuki SAIGUSA: "Seasonal emergence patterns in the intertidal midge,Clunio tsushimensis" Marine Biology(Germany).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Phase shift of a tidal rhythm by light-dark cycles in the semiterrestrial crab Sesarma pictum." Biol. Bull.182. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Observations of egg hatching in the estuarine terrestrial crab Sesarma haematocheir." Pacific Sci.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Control of egg hatching in an estuarine crab. I. Hatching of the embryos detached from the female." Biol. Bull. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Control of egg hatching in an estuarine terrestrial crab. II. Exchange of an egg-cluster between two females" Biol. Bull. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Loss of the egg sponge from the incubating females in the estuarine terrestrial crab Sesarma"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Saigusa: "Variation of locomotor activity patterns in the semiterrestrial crab Sesarma erythroductylum"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Masayuki SAIGUSA: "Phase shift of a tidal rhythm by lightーdark cycles in the semiーterrestrial crab,Sesarma pictum" Biological bulletin(USA). April. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Masayuki SAIGUSA: "Observations of egg hatching in the terrestrial crab Sesarma haematocheir" Pacific Science(USA). July. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuarine terrestrial crab.I.Hatching of the eggs detached from the female" Biological bulletin(USA). June. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuarine terrestrial crab II.Exchange of a cluster of embryos between two females" Biological Bulletin(USA).

    • Related Report
      1991 Annual Research Report
  • [Publications] Masayuki SAIGUSA: "Control of egg hatching in an estuarine terrestrial crab III.Influence of temperature on the hatching"

    • Related Report
      1991 Annual Research Report
  • [Publications] Tadashi AKIYAMA,Masayuki SAIGUSA: "Seasonal emergence patterns in the intertidal midge,Clunio tsushimensis" Marine biology(Germany).

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Saigusa: "Observations of larval hatching in the terrestrial crab Sesarma haematocheir" Pacific Science. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Saigusa: "Phase response of a circatidal rhythm in the semiーterrestrial crab Sesarma pictum" Biological Bulletin. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Saigusa: "Variation in the locomotor activity patterns and the occurvence of a circadian component"

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Saigusa: "Control of Larval hatching in the terrestrial crab Sesarma.I.Hatching of detached embryos"

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Saigusa: "Control of larval hatching in the terrestrial crab Sesarma.II.Role of the Lemale"

    • Related Report
      1990 Annual Research Report
  • [Publications] 三枝 誠行: "甲殻類幼生の孵化機構" 海洋と生物. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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