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- Title
Short activity periods in relation to circadian rhythms in Clethrionomys gapperi.
- Authors
Stebbins, L. L.
- Abstract
Short activity periods in Clethrionomys gapperi (Vigors) are described for November, December, May, and June at Heart Lake, Northwest Territories, Canada (60°45'N, I 16°40'W) and for November, April, May, and June at Edmonton, Alberta (53°N, 113 °28'W). At Heart Lake, 2 successive short activity times occurred synchronously among individuals at dusk each day. This gave a circadian periodicity to their activity with bimodal peaks of activity occurring after dusk. At Edmonton synchronous occurrence of a short period occurred at dawn rather than dusk each day, giving a circadian rhythm with a unimodal peak of activity at dawn. At both latitudes seasonal changes in characteristics of short term rhythms caused corresponding changes in circadian rhythms.
- Subjects
NORTHWEST Territories; CANADA; CLETHRIONOMYS gapperi; CIRCADIAN rhythms; BIOLOGICAL rhythms; CHRONOBIOLOGY
- Publication
Oikos, 1975, Vol 26, Issue 1, p32
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3543273