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Effect of valuable relationship on reconciliation and initiator of reconciliation in captive bottlenose dolphins (Tursiops truncatus)

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Abstract

Reconciliation, post-conflict affiliation between former opponents, was suggested to repair the relationship between former opponents. The number of times that each former opponent initiates reconciliation may be affected by the dominance style. Despotic dominance style was suggested to restrain the initiation of reconciliation by recipients of aggression, unlike relaxed dominance style. Although reconciliation was suggested to restore relationships, reconciliation sometimes did not occur. The valuable relationship hypothesis predicts that reconciliation is more likely to occur when former opponents share a valuable relationship. However, few studies have tested this hypothesis in non-primate species. This study investigated, in captive bottlenose dolphins, which are suggested as having a relaxed dominance style, whether aggressors or recipients of aggression initiate reconciliation, and whether relationships between former opponents affect the occurrence of reconciliation. The number of times that aggressors or recipients of aggression initiate reconciliation did not differ. Recipients of aggression initiated reconciliation sooner than aggressors. These results support the prospect that recipients of aggression are not impeded in initiating reconciliation in relaxed species. Former opponents who share a more affiliative relationship were reconciled more frequently. Bottlenose dolphins were suggested to receive the benefits from individuals who shared more affiliative relationships. The valuable relationship hypothesis may be supported in bottlenose dolphins.

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Acknowledgments

We are grateful to members of Shimonoseki Marine Science Museum, especially Toshiyuki Tatsukawa and Kazutaka Harada, and members of Kagoshima City Aquarium, especially Kyoko Sasaki and Nobuyuki Kashiwagi.

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Correspondence to Chisato Yamamoto.

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Yamamoto, C., Ishibashi, T., Yoshida, A. et al. Effect of valuable relationship on reconciliation and initiator of reconciliation in captive bottlenose dolphins (Tursiops truncatus). J Ethol 34, 147–153 (2016). https://doi.org/10.1007/s10164-016-0459-7

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  • DOI: https://doi.org/10.1007/s10164-016-0459-7

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