| Nocturnal illumination dimmer than starlight altered the circadian rhythm of adult locomotor activity of a fruit fly. | |
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MedLine Citation:
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PMID: 20205559 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of nocturnal irradiance tenfold dimmer than starlight intensity on the locomotor activity rhythm of Drosophila jambulina were investigated in two types of light-dark (12 h:12 h) cycles, in which light intensity of the photophase was 10 lux while that of the scotophase was either 0 lux for control flies or 0.0006 lux for experimental flies. Activity onset in the experimental flies was approximately 5.4 h prior to lights-on, so it occurred around midnight. However, activity onset of the control flies coincided almost with the lights-on. Nevertheless, activity offset was the same in both groups, occurring at lights-off. Duration of the active phase (alpha) and activity passes/fly/cycle (APC) in the experimental flies was far greater than in controls. After-effects of the nocturnal illumination of the light-dark cycles when the flies were transferred to constant darkness were evident as the period of the free-running rhythm was shortened, alpha was lengthened, and APC was enhanced in the experimental compared to control flies. Thus, very low photic sensitivity of these flies appears to be a physiological adaptation to dim-light ambiance in its natural breeding site in the field. |
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Authors:
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Pooja Thakurdas; Shweta Sharma; Boynao Sinam; Meenakshi Chib; Dilip Joshi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Chronobiology international Volume: 27 ISSN: 1525-6073 ISO Abbreviation: Chronobiol. Int. Publication Date: 2010 Jan |
Date Detail:
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Created Date: 2010-03-08 Completed Date: 2010-05-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8501362 Medline TA: Chronobiol Int Country: England |
Other Details:
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Languages: eng Pagination: 83-94 Citation Subset: IM |
Affiliation:
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Center for Biological Rhythm Research, Ahmednagar College, Ahmednagar 414001, M.S., India. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Circadian Rhythm / physiology*, radiation effects* Drosophila / physiology*, radiation effects* Male Motor Activity / physiology*, radiation effects* Photic Stimulation Photoperiod |
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