Photoperiod and Entrainment of Circadian Activity in the Antelope Ground Squirrel
- 1 September 1973
- journal article
- Published by Oxford University Press (OUP) in BioScience
- Vol. 23 (9) , 516-522
- https://doi.org/10.2307/1296478
Abstract
The antelope ground squirrel (Ammosper mophilus leucurus) is highly diurnal, both in natural habitats and in a variety of laboratory light-dark schedules. The pattern results from the interaction of an endogenous rhythm and environmental parameters. Experimental manipulation of light-dark ratios showed that entrained phase angle is sensitive to changes in sunrise and sunset, and probably depends, at least in part, on the integral action of light.Keywords
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