Distribution of circadian photoreceptors in the compound eye of the cricket Gryllus bimaculatus.

Kenji Tomioka, Y. Okada, Y. Chiba

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Adult male crickets (Gryllus bimaculatus) show a nocturnal circadian locomotor rhythm, which is driven by the pacemaker in the optic lamina-medulla complex and synchronizes to the light-dark (LD) cycle received by the compound eye. To see whether there was any specially differentiated circadian photoreceptor area in the eye, we examined the effect of a partial reduction of various areas of the compound eye, in addition to a removal of the contralateral optic lamina-medulla-compound eye complex, on entrainability of the locomotor rhythm. All operated animals showed a response to the LD cycle in their locomotor rhythm, no matter which area of the eye was left intact: They either stably entrained to an LD cycle or showed a sign of weak entrainment. The capacity for stable entrainment was still retained when only 262 ommatidia were left. Transient cycles needed for re-entrainment, following a 6-hr phase advance of the LD cycle, were measured in 20 reduced-eye animals showing clear stable entrainment. They were in inverse proportion to the number of ommatidia in the reduced eye: The fewer ommatidia there were, the more transient cycles were observed (r = -0.76, p less than 0.001). These results suggest that almost the whole area of the compound eye may contain circadian photoreceptors, and that the photic information from each ommatidium may additively affect the circadian clock to entrain via neural integration mechanisms.

Original languageEnglish
Pages (from-to)303-313
Number of pages11
JournalJournal of Biological Rhythms
Volume5
Issue number4
Publication statusPublished - Dec 1990
Externally publishedYes

Fingerprint

Gryllidae
Gryllus bimaculatus
ommatidia
compound eyes
photoreceptors
photoperiod
eyes
laminae (animals)
Photoperiod
optics
animal behavior
circadian rhythm
Circadian Clocks
Circadian Rhythm
animals

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Physiology
  • Physiology (medical)

Cite this

Distribution of circadian photoreceptors in the compound eye of the cricket Gryllus bimaculatus. / Tomioka, Kenji; Okada, Y.; Chiba, Y.

In: Journal of Biological Rhythms, Vol. 5, No. 4, 12.1990, p. 303-313.

Research output: Contribution to journalArticle

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