Summary
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1.
The cricketTeleogryllus commodus Walk, has a circadian stridulatory rhythm, whose free-running period is 25 h 40' in LL at 20–35 Lux light intensity, and 23 h 36' in DD. Under LD conditions, stridulatory activity is synchronized and begins 2 h before the onset of darkness.
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2.
The compound eyes are the only photoreceptors through which entrainment by environmental light-dark changes can take place. Uncoupling of the compound eyes from the environment by cutting the ommatidial nerves results under LD or LL conditions in a free-running stridulatory rhythm similar to that of unoperated ♂♂ held in DD.
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3.
Severance of both optic lobes causes a breakdown of the singing-rhythm and stridulation is randomly distributed over the 24 h-period. Removal of one optic lobe does not affect the rhythm. The location of the timing-device is discussed with regard to these results.
Zusammenfassnng
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1.
Die GrilleTeleogryllus commodus Walk, hat eine circadiane Singrhythmik, deren freilaufende Periode im Dauerlicht bei 20–35 Lux 25 h 40 min beträgt, im Dauerdunkel dagegen 23 h 36 min. Im Licht-Dunkelwechsel wird die Singaktivität synchronisiert und beginnt 2 h vor Anbruch der Dunkelheit.
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2.
Die Komplexaugen sind die einzigen Photorezeptoren, über die eine Synchronisation der Singrhythmik durch Licht-Dunkelzyklen erfolgen kann. Durchtrennt man die Ommatidiennerven und entkoppelt dadurch die Komplexaugen von der Umgebung, dann zeigt die Grille im Licht-Dunkelwechsel oder im Dauerlicht eine freilaufende Singrhythmik, die einer solchen von nichtoperierten ♂♂ im Dauerdunkel entspricht.
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3.
Eine Durchtrennung der beiden Lobi optici hat arhythmische Stridulation zur Folge, die unregelmäßig über den 24 h-Tag verteilt ist. Die Wegnahme eines Lobus opticus beeinflußt dagegen den Singrhythmus nicht. Die Lokalisation der „inneren Uhr” wird im Hinblick auf diese Ergebnisse diskutiert.
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I wish to thank Larry Crooks and Paul Mauldin for the design of the recording-equipment. I am grateful to Colin S. Pittendrigh and Phillip Sokolove for critically reading the manuscript, to M. K. Chandrashekaran for commenting on an early draft of the paper, and to Kathy Edson for technical assistance. This work has been supported by NIH-grant 5 R01 HD 03619.
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Loher, W. Circadian control of stridulation in the cricketTeleogryllus commodus Walker. J. Comp. Physiol. 79, 173–190 (1972). https://doi.org/10.1007/BF00697770
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DOI: https://doi.org/10.1007/BF00697770