Get access

Third-party postconflict affiliation of aggressors in chimpanzees

Authors

  • Teresa Romero,

    Corresponding author
    1. Living Links, Yerkes National Primate Research Center, Emory University, Atlanta
    Current affiliation:
    1. Department of Cognitive and Behavioral Science, Graduate School of Arts and Sciences, The University of Tokyo 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
    • Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322
    Search for more papers by this author
  • Frans B.M. de Waal

    1. Living Links, Yerkes National Primate Research Center, Emory University, Atlanta
    Search for more papers by this author

Abstract

Postconflict management strategies have been defined as any postconflict interaction that mitigates the negative consequences of the preceding agonistic conflict. Although most studies have investigated postconflict interactions between former opponents or between victims and uninvolved bystanders, interactions between aggressors and bystanders have received much less attention. In this study, we examined a database of 1,102 agonistic interactions and their corresponding postconflict periods in two outdoor-housed groups of captive chimpanzees in order to test the occurrence of postconflict third-party affiliation of aggressors. Our results confirmed the occurrence of appeasement, i.e. postconflict affiliation by a bystander toward an aggressor, but failed to detect the occurrence of postconflict affiliation directed from aggressors toward bystanders. Appeasement rates did not differ according to the sex of the involved individuals. In addition, appeasement occurred more often in the absence of reconciliation than after its occurrence suggesting that appeasement may act as an alternative to reconciliation when the latter fails to occur. Both study groups showed behavioral specificity for appeasement, i.e. context-specific use of certain behaviors, supporting the view that chimpanzees exhibit highly visible explicit postconflict affiliation. Am. J. Primatol. 73:397–404, 2011. © 2010 Wiley-Liss, Inc.

Ancillary