Constant light disrupts the circadian but not the circatidal rhythm in mangrove crickets. Issue 3 (4th May 2017)

• Record Type: Journal Article
• Authors: Satoh, Aya
• Is Part Of: Biological rhythm research. Volume 48:Issue 3(2017)
• Page Start: 459
• Page End: 463
• Publication Date: 2017-05-04
• Subjects: Circadian -- circatidal -- mangrove crickets; Biological rhythms -- Periodicals; Chronobiology -- Periodicals; Cycles -- Periodicals; Biological Clocks; Chronobiology; Circadian Rhythm; 570
• DOI: 10.1080/09291016.2016.1275392
• Languages: English
• ISSNs: 0929-1016

Abstract

Abstract: Mangrove crickets have a circatidal activity rhythm (~12.6 h cycles) with a circadian modulation under constant darkness (DD), whereby activity levels are higher during subjective night low tides than subjective day low tides. This study explored the locomotor activity rhythm of mangrove crickets under constant light (LL). Under LL, the crickets also exhibited a clear circatidal activity rhythm with a free-running period of 12.6 ± 0.26 h (mean ± SD, n = 6), which was not significantly different from that observed under DD. In contrast, activity levels were almost the same between subjective day and night, unlike those under DD, which were greater during subjective night. The loss of circadian modulation under LL may be explained by the suspension of the circadian clock in these conditions. These results strongly suggest that the circatidal activity rhythm is driven by its own clock system, distinct from the circadian clock.