Authors: Kazuhiro Tanaka Yasuhiko Watari
Publish Date: 2011/06/28
Volume: 98, Issue: 8, Pages: 711-715
Abstract
To confirm whether the amplitude of diel temperature cycles causes a phase shift of adult eclosion rhythm of the onion fly Delia antiqua the peak time Ø E of adult eclosion was determined under various thermoperiods with a fixed temperature either in the warm or cool phase and temperature differences ranging from 1°C to 4°C between the two phases Irrespective of the temperature level during the warm or cool phase Ø E occurred earlier with decreasing amplitude of the temperature cycle The results strongly support the previous conclusion of Tanaka and Watari Naturwissenschaften 9076–79 2003 that D antiqua responds to the amplitude of temperature cycle as a cue for the circadian adult eclosion timing The phase advance was larger in thermoperiods with a fixed warmphase temperature than in those with a fixed coolphase temperature This might be ascribed to the interaction between the amplitude and level of temperature in the thermoperiodic regimesWe thank Sinzo Masaki and Yosuke Miyazaki for comments on improving the early version of the manuscript Thanks also to Toru Shimizu for providing the computer program and Osamu Saito for technical assistance This study was supported in part by a Special Research Grant from Miyagi Gakuin Women’s University 2008 and by Grant in Aid for Scientific Research C from Japan Society for the Promotion of Science 14540586 19570075 22570028
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