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Circadian locomotory rhythm and the influence of moulting in Australian field cricket nymphs
Author(s) -
YAGI KOICHIRO J.,
LOHER W.
Publication year - 1986
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1986.tb00394.x
Subject(s) - moulting , biology , circadian rhythm , rhythm , cricket , entrainment (biomusicology) , nymph , light cycle , darkness , metamorphosis , phase response curve , zoology , ecology , larva , medicine , endocrinology , botany , circadian clock
. Evidence is presented for a circadian control of locomotory activity in the larval stadia of the cricket, Teleogryllus commodus Walker. Under light—dark cycles (LD), maximal activity occurs around the L/D transition and/or in the hours preceding it. Free‐running rhythm patterns longer than 24 h are observed in constant light. Re‐entrainment to phase advances in the LD cycle is also accompanied by several transient cycles. However, free‐running rhythms under constant darkness or transients when exposed to LD cycle delays were not found. LD cycles during the eighth stadium set the phase of a free‐running rhythm in the adult, even if the nymph does not show a rhythm. Nymphal activity is often erratic and is disrupted periodically by the moulting cycle, but moulting does not interrupt the operation of the circadian system. The daily timing of the moult itself is not under circadian control.