Document Detail

Effects of photoperiod and aging on locomotor activity rhythms in the onion fly, Delia antiqua.
MedLine Citation:
PMID:  12770419     Owner:  NLM     Status:  Publisher    
At photoperiods longer than 8h per 24h, adults of the day-active onion fly Delia antiqua showed a major peak of locomotor activity in the late photophase and also bursts of activity induced by lights-on or lights-off. At shorter photoperiods the activity peaks fused. After transfer from long photoperiods to constant darkness (DD), the rhythm free-ran, but only the major peak persisted. This suggests that only the major peak is controlled by the circadian pacemaker. At long photoperiods, the daily phase of the major peak occurred progressively later with age. As a result, the activity at short photoperiods often shifted from photophase to scotophase in old flies. The free-running period (tau) also changed with age; tau was shorter than 24h until 14-20 days after eclosion and thereafter became longer, but a few individuals repeated changes in tau. The phase delay of locomotor activity with age in D. antiqua would be attributable to the increase in tau.
T Arai; Y Watari
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Publication Detail:
Journal Detail:
Title:  Journal of insect physiology     Volume:  43     ISSN:  1879-1611     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  2003-May-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  567-576     Citation Subset:  -    
Laboratory of Biotechnology, Ashiya University, Rokurokuso-cho 13-22, Ashiya, Hyogo, Japan
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