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Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females.

Publication ,  Journal Article
Forward, RB; Sanchez, KG; Riley, PP
Published in: The Biological bulletin
February 2016

The subtidal crab Dyspanopeus sayi has a circadian rhythm in larval release with a free-running period of 24.1 h. Under constant conditions, eggs hatch primarily in the 4-h interval after the time of sunset. The study tested the new model for entrainment in subtidal crabs, which proposes that the female perceives the environmental cycles and entrains the endogenous rhythm in the embryos. Results verified the model for D. sayi. Hatching by embryos collected from the field when they had not yet developed eye pigments, and were kept in constant conditions attached to their mother, exhibited the circadian hatching rhythm. Attached embryos could also be entrained to a new photoperiod in the laboratory before they developed eye pigments. Further, mature embryos removed from the female hatched rhythmically, indicating that a circadian rhythm resides in the embryos. However, if mature embryos with eye pigments were removed from the female and exposed to a new light-dark cycle, they could not be entrained to the new cycle; rather, they hatched according to the timing of the original light-dark cycle. Nevertheless, detached, mature embryos would entrain to a new light-dark cycle if they were in chemical, but not physical, contact with the female. Thus, the female perceives the light-dark cycle, and uses chemical cues to entrain the circadian rhythm of hatching by the embryos.

Duke Scholars

Published In

The Biological bulletin

DOI

EISSN

1939-8697

ISSN

0006-3185

Publication Date

February 2016

Volume

230

Issue

1

Start / End Page

15 / 24

Related Subject Headings

  • Pigments, Biological
  • Photoperiod
  • Ovum
  • Light
  • Larva
  • Female
  • Darkness
  • Cues
  • Circadian Rhythm
  • Brachyura
 

Citation

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Forward, R. B., Sanchez, K. G., & Riley, P. P. (2016). Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females. The Biological Bulletin, 230(1), 15–24. https://doi.org/10.1086/bblv230n1p15
Forward, Richard B., Kevin G. Sanchez, and Paul P. Riley. “Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females.The Biological Bulletin 230, no. 1 (February 2016): 15–24. https://doi.org/10.1086/bblv230n1p15.
Forward RB, Sanchez KG, Riley PP. Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females. The Biological bulletin. 2016 Feb;230(1):15–24.
Forward, Richard B., et al. “Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females.The Biological Bulletin, vol. 230, no. 1, Feb. 2016, pp. 15–24. Epmc, doi:10.1086/bblv230n1p15.
Forward RB, Sanchez KG, Riley PP. Entrainment of the Circadian Rhythm in Egg Hatching of the Crab Dyspanopeus sayi by Chemical Cues from Ovigerous Females. The Biological bulletin. 2016 Feb;230(1):15–24.
Journal cover image

Published In

The Biological bulletin

DOI

EISSN

1939-8697

ISSN

0006-3185

Publication Date

February 2016

Volume

230

Issue

1

Start / End Page

15 / 24

Related Subject Headings

  • Pigments, Biological
  • Photoperiod
  • Ovum
  • Light
  • Larva
  • Female
  • Darkness
  • Cues
  • Circadian Rhythm
  • Brachyura