Long-distance dispersal and feeding strategy of the red-sided garter snake (Thamnophis sirtalis parietalis) in the Interlake of Manitoba

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Abstract
Previous ecological studies of Thamnophis sirtalis in the Interlake region of Manitoba have concentrated on the spring and fall phases of the annual cycle. This study is an investigation of two aspects of the summer activity of these populations: summer dispersal and feeding habits. Summer dispersal in these animals is highly directional; snakes move south in spring and return north to their hibernation sites in late summer and fall. Large distances are also involved; movements of as much as 17.7 km have been recorded. No explanation of this pattern of dispersal is apparent. Feeding takes place in the summer range only, during June, July, and August. The wood frog (Rana sylvatica) is the most frequently eaten prey species. It is suggested that the short feeding period is the result of a life history strategy which maximizes the efficiency of reproductive activities at the expense of non-reproductive activities.

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