Inconsistency in the expression of locomotor and ERG circadian rhythms in the German cockroach, Blattella germanica (L.)
Resource
Archives of Insect Biochemistry and Physiology, 48(3), 155-166
Journal
Archives of Insect Biochemistry and Physiology
Journal Volume
48
Journal Issue
3
Pages
155-166
Date Issued
2001
Date
2001
Author(s)
Chang, Huan-Wen
Abstract
ERG recordings from German cockroaches showed that the amplitude of light-evoked responses have a circadian rhythmicity in adult males that coincided with the locomotor circadian rhythm. The peak of the response occurred during the subjective night, and the circadian period was less than 24 h under DD condition. In contrast, although the locomotor circadian rhythm was masked by the development of ovaries and pregnancy in females, their visual responses displayed circadian rhythmicity. This inconsistency in expression of locomotor and visual sensitivity circadian rhythms in females implied separate pacemakers for these two overt rhythms. After severing the optic nerves, changes in ERG amplitude of the operated cockroaches still displayed a circadian rhythm under DD condition, demonstrating that the visual sensitive pacemaker was located in the eye and independent from the locomotor pacemaker.
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Type
journal article
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