Journal article
Mammalian activity - rest rhythms in Arctic continuous daylight
Biological rhythm research, Vol.37(6), pp.455-469
12/01/2006
DOI: 10.1080/09291010600738551
Abstract
Activity - rest (circadian) rhythms were studied in two species of Arctic mammals living in Arctic continuous daylight with all human-induced regular environmental cues (zeitgebers) removed. The two Arctic species (porcupine and ground squirrel) lived outdoors in large enclosures while the Arctic summer sun circled overhead for 82 days. Would local animals maintained under natural continuous daylight demonstrate the Aschoff effect described in previously published laboratory experiments using continuous light, in which rats' circadian activity patterns changed systematically to a longer period, expressing a 26-hour day of activity and rest? The outdoor experiments reported here, however, showed that under natural continuous daylight, both species (porcupine and ground squirrel) had specific times of activity and rest on a nearly 24-hour scale, and their activity peaks did not come later each day. The daily rhythms of the two species were recorded using implanted physiological radio capsules, and from direct observation.
Details
- Title: Subtitle
- Mammalian activity - rest rhythms in Arctic continuous daylight
- Creators
- G. Edgar Folk - Department of Physiology and Biophysics , College of MedicineDiana L Thrift - Department of Physiology and Biophysics , College of MedicineM. Bridget Zimmerman - Department of Biostatistics , College of Public Health, The University of IowaPaul C Reimann - Department of Anatomy and Cell Biology , College of Medicine, The University of Iowa
- Resource Type
- Journal article
- Publication Details
- Biological rhythm research, Vol.37(6), pp.455-469
- Publisher
- Taylor & Francis
- DOI
- 10.1080/09291010600738551
- ISSN
- 0929-1016
- eISSN
- 1744-4179
- Language
- English
- Date published
- 12/01/2006
- Academic Unit
- Biostatistics
- Record Identifier
- 9984214714402771
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