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Updated: Apr 16, 2026

Recording and Analysis of Circadian Rhythms in Running-wheel Activity in Rodents
Published on: January 24, 2013
Persistence, entrainment, and function of circadian rhythms in polar vertebrates
Cory T Williams1, Brian M Barnes2, C Loren Buck3
1Department of Biological Sciences, University of Alaska Anchorage, Anchorage, Alaska; and.
Abstract:
Polar organisms must cope with an environment that periodically lacks the strongest time-giver, or zeitgeber, of circadian organization-robust, cyclical oscillations between light and darkness. We review the factors influencing the persistence of circadian rhythms in polar vertebrates when the light-dark cycle is absent, the likely mechanisms of entrainment that allow some polar vertebrates to remain synchronized with geophysical time, and the adaptive function of maintaining circadian rhythms in such environments.
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