Abstract
The development of spatial patterns relevant to natal philopatry and dispersal was examined in yearling Columbian ground squirrels, Spermophilus columbianus. Observations using scan and all-occurrence sampling recorded the activities and locations of 56 yearlings in a population in southwestern Alberta. Yearling males moved greater distances from spring emergence to the time of dispersal from the colony. Females were more restricted in their movements, with no increase in the maximum distance moved over the summer. Early movement patterns of males reflected patterns of later dispersal, whereas females appeared to centre their activities on the natal area. These differences are discussed in light of the proximate causes of dispersal in the Columbian ground squirrel.
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