Abstract
The locomotor activity of 40 crickets receiving bilateral optic lamina-medulla removal as 7th-instar nymph was recorded under a light cycle and then constant darkness, and the records were analyzed statistically by an autocorrelogram and maximal entropy spectrum method. The activity of the nymphal stage was severely reduced and no rhythmicity was detected for the first few weeks following the operation. After the imaginal moult, activity gradually increased up to 20 times the nymphal activity. About 50% of the adult crickets restored a rhythmicity with peaks in the light phase, unlike the nocturnal rhythm of intact crickets. The synchronization of the activity was probably due to the newly established neural connection between the retina and the cut end of the optic stalk. The onset of the rhythmic activity preceded lights-on, suggesting the involvement of an endogenous mechanism. In constant darkness, a half of the rhythmic cricket lost the rhythmicity. However, 21% of the crickets retained the rhythmicity and the remaining 26% exhibited an ultradian rhythmicity. On the basis of these results, the involvement of moltiple oscillators, outside the optic lobe, in the regulation of the circadian locomotor rhythm is discussed.
| Original language | English |
|---|---|
| Journal | Journal of Insect Physiology |
| Volume | 35 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 1989 |
| Externally published | Yes |
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Keywords
- circadian locomotor rhythm
- circadian organization
- Cricket
- multiple oscillator system
- optic lobe
ASJC Scopus subject areas
- Insect Science
- Physiology
Cite this
Photoperiodic entrainment of locomotor activity in crickets (Gryllus bimaculatus) lacking the optic lobe pacemaker. / Tomioka, Kenji; Chiba, Yoshihiko.
In: Journal of Insect Physiology, Vol. 35, No. 11, 1989.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Photoperiodic entrainment of locomotor activity in crickets (Gryllus bimaculatus) lacking the optic lobe pacemaker
AU - Tomioka, Kenji
AU - Chiba, Yoshihiko
PY - 1989
Y1 - 1989
N2 - The locomotor activity of 40 crickets receiving bilateral optic lamina-medulla removal as 7th-instar nymph was recorded under a light cycle and then constant darkness, and the records were analyzed statistically by an autocorrelogram and maximal entropy spectrum method. The activity of the nymphal stage was severely reduced and no rhythmicity was detected for the first few weeks following the operation. After the imaginal moult, activity gradually increased up to 20 times the nymphal activity. About 50% of the adult crickets restored a rhythmicity with peaks in the light phase, unlike the nocturnal rhythm of intact crickets. The synchronization of the activity was probably due to the newly established neural connection between the retina and the cut end of the optic stalk. The onset of the rhythmic activity preceded lights-on, suggesting the involvement of an endogenous mechanism. In constant darkness, a half of the rhythmic cricket lost the rhythmicity. However, 21% of the crickets retained the rhythmicity and the remaining 26% exhibited an ultradian rhythmicity. On the basis of these results, the involvement of moltiple oscillators, outside the optic lobe, in the regulation of the circadian locomotor rhythm is discussed.
AB - The locomotor activity of 40 crickets receiving bilateral optic lamina-medulla removal as 7th-instar nymph was recorded under a light cycle and then constant darkness, and the records were analyzed statistically by an autocorrelogram and maximal entropy spectrum method. The activity of the nymphal stage was severely reduced and no rhythmicity was detected for the first few weeks following the operation. After the imaginal moult, activity gradually increased up to 20 times the nymphal activity. About 50% of the adult crickets restored a rhythmicity with peaks in the light phase, unlike the nocturnal rhythm of intact crickets. The synchronization of the activity was probably due to the newly established neural connection between the retina and the cut end of the optic stalk. The onset of the rhythmic activity preceded lights-on, suggesting the involvement of an endogenous mechanism. In constant darkness, a half of the rhythmic cricket lost the rhythmicity. However, 21% of the crickets retained the rhythmicity and the remaining 26% exhibited an ultradian rhythmicity. On the basis of these results, the involvement of moltiple oscillators, outside the optic lobe, in the regulation of the circadian locomotor rhythm is discussed.
KW - circadian locomotor rhythm
KW - circadian organization
KW - Cricket
KW - multiple oscillator system
KW - optic lobe
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U2 - 10.1016/0022-1910(89)90098-X
DO - 10.1016/0022-1910(89)90098-X
M3 - Article
VL - 35
JO - Journal of Insect Physiology
JF - Journal of Insect Physiology
SN - 0022-1910
IS - 11
ER -