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The bear circadian clock doesn’t ‘sleep’ during winter dormancy
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Jansen, Heiko T. , Leise, Tanya, Stenhouse, Gordon, Pigeon, Karine, Kasworm, Wayne, Teisberg, Justin, Radandt, Thomas, Dallmann, Robert, Brown, Steven and Robbins, Charles T. (2016) The bear circadian clock doesn’t ‘sleep’ during winter dormancy. Frontiers in Zoology, 13 (42). doi:10.1186/s12983-016-0173-x
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Official URL: http://dx.doi.org/10.1186/s12983-016-0173-x
Abstract
Most biological functions are synchronized to the environmental light:dark cycle via a circadian timekeeping system. Bears exhibit shallow torpor combined with metabolic suppression during winter dormancy. We sought to confirm that free-running circadian rhythms of body temperature (Tb) and activity were expressed in torpid grizzly (brown) bears and that they were functionally responsive to environmental light. We also measured activity and ambient light exposures in denning wild bears to determine if rhythms were evident and what the photic conditions of their natural dens were. Lastly, we used cultured skin fibroblasts obtained from captive torpid bears to assess molecular clock operation in peripheral tissues. Circadian parameters were estimated using robust wavelet transforms and maximum entropy spectral analyses.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QL Zoology | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Research Centres > Warwick Systems Biology Centre Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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| Library of Congress Subject Headings (LCSH): | Circadian rhythms, Bears -- Hibernation | ||||||||
| Journal or Publication Title: | Frontiers in Zoology | ||||||||
| Publisher: | BioMed Central Ltd. | ||||||||
| ISSN: | 1742-9994 | ||||||||
| Official Date: | December 2016 | ||||||||
| Dates: |
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| Volume: | 13 | ||||||||
| Number: | 42 | ||||||||
| DOI: | 10.1186/s12983-016-0173-x | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Funder: | Interagency Grizzly Bear Committee (U.S.), Raili Korkka Brown Bear Endowment, International Association for Bear Research and Management, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), U.S. Fish and Wildlife Service |
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