Abstract
Populations of Lemmiscus curtatus were monitored on three study plots in sagebrush steppe of southeastern Idaho over a 13-month period. Average densities of Lemmiscus ranged from 4 to 16/ha. Sagebrush voles bred during winter after a period of population decline and prior to a population increase. Summer median weights at sexual maturity were 14.6 g for males, 16.4 g for females, and did not differ significantly. Tagging with 182Ta showed that sagebrush voles occurred singly or in pairs during the summer rather than in colonies as suggested by previous investigators. Food habit analysis revealed that the most common food items in June and August were Castelleja sp. and Lupinus sp., respectively.
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