Effects of Climate on the Circannual Rhythm of the Eastern Chipmunk, Tamias striatus

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Abstract
The eastern chipmunk (Tamias striatus), a temperate sciurid, has evolved precise timing of breeding in southeast Ohio similar to the strategy found in the Arctic ground squirrel (Spermophilus undulatus). Abnormally low ambient temperatures in late winter did not delay the timing of the spring breeding season, but the number of breeding females declined. However, atypically cold temperatures in early spring delayed the timing of post-torpor activity. The evolution and adaptive nature of precise breeding periods and a flexible schedule with regard to seasonal emergence are postulated and related to the ecology of chipmunks in southeast Ohio.

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