Individual variation in the dear enemy phenomenon via territorial vocalizations in red squirrels

In: Behaviour
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  • a Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
  • b Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada
  • c Department of Natural Resource Sciences, Macdonald Campus, McGill University, Ste-Anne-de-Bellevue, QC, Canada
  • d Department of Psychology, University of Michigan, Ann Arbor, MI, USA
  • e Department of Ecology & Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
  • f Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada

Abstract

Territoriality arises when the benefits of resources exceed the costs of defending them. The dear enemy phenomenon, where familiar territorial neighbours refrain from intruding on one another and mutually reduce their defensive efforts, allows for reduction of these costs but requires discrimination between conspecifics. We hypothesized that territorial vocalizations in red squirrels (Tamiasciurus hudsonicus) are used for this discrimination. We performed a speaker replacement experiment where red squirrels (N=41) were temporarily removed from their territories and replaced with a speaker broadcasting their own call, an unfamiliar call, or silence. Contrary to our prediction, there were no differences in overall intrusion risk among our three playbacks, but the identity of intruders did vary. Existing variation in familiarity within territorial neighbourhoods should be considered, rather than the binary classification of familiar or stranger, when studying dear enemy effects. We also discuss the variable importance of silence in acoustic territorial populations.

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