Circadian phase-response curves for light in nymphal and adult crickets, Gryllus bimaculatus

Yasuo Okada, Kenji Tomioka, Yoshihiko Chiba

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The circadian locomotor rhythm of the cricket, Gryllus bimaculatus, is regulated by two pacemakers, one located in each optic lamina-medulla complex of the protocerebrum, and is readily entrained to light-dark cycles. We investigated effects of light pulses on nymphal (diurnal) and adult (nocturnal) free-running locomotor rhythms. When a 3 h light pulse was given, adult crickets free-running under constant darkness showed a clear phase shift in a manner dependent on time of day. The phase-response curves for the light pulses showed phase delays in the early subjective night, phase advances in the late subjective night, and little response in the mid-subjective day. Unilateral removal of the lamina-medulla-compound eye complex had no effects on phase-responsiveness to 3 h light pulses, suggesting that the shape of the phase-response curve reflects the property of a single circadian pacemaker. The average free-running period for the operated animal [23.73±0.25 (SD) h, N = 58] was significantly shorter than that of the intact animal [23.86±0.24 (SD) h, N = 99] (t-test, P <0.01), suggesting the existence of mutual interaction between the optic lobe pacemakers. Eighth-instar nymphal crickets were revealed to have a phase-response curve similar to that of adults, although their circadian rhythm is quite different from that of adults not only in phasing but also in free-running period and waveform. The fact strongly suggests that the adult nocturnal and the nymphal diurnal rhythms share common pacemakers.

Original languageEnglish
Pages (from-to)583-590
Number of pages8
JournalJournal of Insect Physiology
Volume37
Issue number8
DOIs
Publication statusPublished - 1991
Externally publishedYes

Keywords

  • Circadian rhythm
  • circadian pacemaker
  • cricket
  • light pulse
  • optic lobe
  • phase shift
  • phase-response curve

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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