Abstract
Two experiments were conducted with lemmings to determine which of two species, Lemmus trimucronatus and Dicrostonyx groenlandicus, was capable of exercising aggressive social dominance over the other in staged, dyadic encounters, and which was able to outcompete the other for a single shelter. Agonistic behaviour occurred in all dyadic encounters, but dominance was not established by either species. A sequential analysis of encounters revealed that each species had a distinct fighting strategy. In shelter competition, prior residence was a crucial factor in the outcome. However, one species did not completely exclude the other. Further evidence to support species differences in fighting strategies was derived from the shelter experiments. These results are discussed in relation to ecological considerations.
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