Hatching of an estuarine crab, Sesarma haematocheir: Factors affecting the timing of hatching in detached embryos, and enhancement of hatching synchrony by the female

Masayuki Saigusa

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The zoeas of the estuarine terrestrial crab Sesarma haematocheir hatch in synchrony with nocturnal high tides. Hatching is also highly synchronized among embryos: i.e., female-attached embryos would all hatch within 1 h, if the female is maintained at about 23°C. This study examined the factors affecting the timing of hatching in female-attached and detached embryos. The timing of hatching in the embryos detached from the female was somewhat affected by continuous light, salinity, and cluster size, but it was much more strongly affected by low temperature. In addition, a notable feature was that the influence of low temperature was markedly different between female-attached embryos and detached embryos. Hatching of this crab occurs after a special developmental process for hatching ('hatching program') that requires 48-49.5 h. This program would be mediated by a temperature-dependent process. Hatching of this crab cannot be fully explained in terms of osmotic effects. Since hatching of female-attached embryos was highly synchronized, the female should release an (unknown) stimulus enhancing hatching synchrony among embryos. Highly synchronized hatching among embryos would enable the female to release hatched zoeas into the water all at one time.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalJournal of Oceanography
Volume56
Issue number1
DOIs
Publication statusPublished - Feb 1 2000

Keywords

  • Embryos
  • Endogenous clock
  • Environmental factors
  • Estuarine crab
  • Hatching
  • Synchrony

ASJC Scopus subject areas

  • Oceanography

Fingerprint Dive into the research topics of 'Hatching of an estuarine crab, Sesarma haematocheir: Factors affecting the timing of hatching in detached embryos, and enhancement of hatching synchrony by the female'. Together they form a unique fingerprint.

  • Cite this