| Nocturnalism induced by scheduled feeding in diurnal Octodon degus. | |
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MedLine Citation:
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PMID: 20370467 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Octodon degus, a mainly diurnal rodent, characterized by its ability to shift to a nocturnal locomotor pattern under laboratory conditions, was studied to determine whether restricted food access during the scotophase could induce nocturnalism. To address this question, wheel running activity, feeding, and body temperature rhythms were analyzed for diurnal degus housed with a wheel and subjected to either long (12 h) or short (2 h) food availability periods, in the latter case with random or scheduled food access times. The results show that allowing nocturnal feeding for 2 h, but not 12 h, can shift a previous diurnal phase preference for wheel running activity and body temperature to the scotophase, with random feeding being more effective than scheduled food availability. However, this behavioral inversion proved to be unstable, as the degus returned to the diurnal phase within only a few days after the restricted feeding was discontinued. In addition, the negative masking effect induced by light, which is characteristic of the degus' nocturnal chronotype, was not observed when the animals were forced to feed at night. Thus, neither long, short, random, nor scheduled food-availability during the scotophase was able to induce all the characteristics of the nocturnal chronotype in Octodon degus. |
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Authors:
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Pablo Vivanco; Antonio L?pez-Espinoza; Ana Maria Madariaga; Maria Angeles Rol; Juan Antonio Madrid |
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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: 2010-04-07 Completed Date: 2010-06-15 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: 233-50 Citation Subset: IM |
Affiliation:
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1Chronobiology Laboratory, Department of Physiology, Faculty of Biology, University of Murcia, Murcia, Spain. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Behavior, Animal / physiology* Biological Clocks / physiology Body Temperature Circadian Rhythm / physiology* Feeding Behavior / physiology* Feeding Methods* Light Male Motor Activity / physiology* Octodon / physiology* Photoperiod* |
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