Abstract
Meadow jumping mice held under LD 12:12 are more prone to prepare for and enter hibernation than animals held under LD 15.33:8.67, regardless of the temperature. Also, rhythms in body weight and hibernating-nonhibernating activity were demonstrated under LD 12:12 but not under LD 15.33:8.67. Seven of 11 animals responded to clock-shifted, naturally decreasing daylengths by preparing for and entering hibernation during a simulated time span corresponding to animals in nature. Therefore, it appears that Zapus hudsonius uses a photoperiod cue for preparation and initiation of hibernating, in contrast to Z. princeps, which uses seed availability.
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