Abstract
Home ranges of Tamias striatus were spatially concen- trated and most stable temporally in areas of woodlot habitat where some degree of transition existed between forest and field. Between 69-90% of all home ranges lay entirely within, or extended into, the ecotone. During late July several chipmunks concentrated their activities in and near a patch of fruiting raspberries in the ecotone. Areas of home ranges, which varied from 0.11 to 1.38 acres, remained constant in July and August but increased in September. The greater distances traveled by chipmunks during September and October were attributed to autumn foraging. When the population density decreased through trap mortality and probable emigration, other chipmunks expanded their home ranges, shifted their centers of activity towards vacated areas, or entered the trappable population.
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