Behavioral Ecology and Sociobiology

, Volume 67, Issue 6, pp 895–904 | Cite as

The smell of desperadoes? Beavers distinguish between dominant and subordinate intruders

  • Helga Veronica Tinnesand
  • Susan Jojola
  • Andreas Zedrosser
  • Frank Rosell
Original Paper

Abstract

Olfactory signals can contain information, such as age and social status, and play a vital role in competitor assessment. In many territorial species, subordinates must leave their natal colony to obtain their own territory and mate. These individuals could be aggressive opponents in agonistic encounters, as they will have little to lose (the desperado effect). In this study, we tested the hypothesis that dominance and age are coded in the anal gland secretion (AGS) of the monogamous and highly territorial Eurasian beaver (Castor fiber), and if this information is used by conspecifics to evaluate the potential threat posed by an intruder. Territorial intrusions were simulated by presenting residents with a two-way choice test of AGS from an unknown male territory owner (i.e., dominant) and his son (i.e., subordinate; either 1 or ≥2 years old). Residents spent more time investigating AGS from subordinates than their fathers and responded more aggressively to subordinates than their fathers when subordinates were ≥2 years old. Chemical analyses gas chromatography and multivariate data analysis supported our behavioral findings and revealed differences between chemical profiles of territory owners and subordinates, as well as between the subordinates in different age classes. This study reveals that information about age and social status is coded in AGS of beavers and that this information is used to determine the level of an eventual future response to the signaler.

Keywords

Anal gland secretion Castor fiber Chemical communication Competitor assessment Desperado effect Dominant–subordinate discrimination 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Helga Veronica Tinnesand
    • 1
  • Susan Jojola
    • 1
    • 2
  • Andreas Zedrosser
    • 1
    • 2
    • 3
  • Frank Rosell
    • 1
  1. 1.Faculty of Arts and Sciences, Department of Environmental and Health StudiesTelemark University CollegeNorway
  2. 2.Department of Ecology and Natural Resource ManagementNorwegian University of Life SciencesÅsNorway
  3. 3.Department of Integrative Biology, Institute of Wildlife Biology and Game ManagementUniversity of Natural Resources and Applied Life SciencesViennaAustria

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