[MARMAM] NEW PAPER: Functions of post-conflict affiliation in bottlenose dolphins

Chisato Yamamoto chisato.yamamoto14 at gmail.com
Tue Mar 3 21:15:33 PST 2020

Dear Marmam list members,

I'm pleased to announce the following paper on post-conflict bystander
affiliation in bottlenose dolphins.

Yamamoto C., Ishibashi T., Kashiwagi N., Amano M. (2020) Functions of
post-conflict bystander affiliations toward aggressors and victims in
bottlenose dolphins. Scientific Reports 10: 3776

This is an open-access and everyone can download this paper from the
following site: https://doi.org/10.1038/s41598-020-60423-6

[Abstract] Post-conflict affiliations initiated by bystanders (bystander
affiliation) toward aggressors or victims have been suggested to represent
the function of conflict management in some social living species. However,
the function of bystander affiliations toward aggressors and victims has
not been examined in marine mammals. In the present study, we investigated
the function of bystander affiliations to aggressors and victims in
bottlenose dolphins: self-protection, the substitute of reconciliation,
social facilitation and tension relief of opponents. These bystander
affiliations did not reduce post-conflict attacks by former opponents
against group members. Bystander affiliation to aggressors tended to be
performed by a bystander who had an affiliative relationship with the
aggressor but not with the victim. Bystander affiliation to victims also
tended to be initiated by a bystander who had an affiliative relationship
with the victim but not the aggressor and was close to former opponents at
the end of aggressions. Affiliation among group members who stayed near
former opponents during aggressions did not increase after aggressions
compared to that under control conditions. Renewed aggressions between
former opponents decreased after bystander affiliations in our previous
study. Bystanders who showed social closeness to former opponents may
initiate bystander affiliation toward their affiliative former opponents
because they may feel emotion, such as anxiety and excitement, of former
opponents. Bystander affiliation toward aggressors and victims may function
as tension relief between former opponents. Bystanders of bottlenose
dolphins, who may have a relaxed dominant style, might initiate
post-conflict affiliation to affiliative individuals unaffected by the
dominance relationships among them, unlike despotic species.

All the best,

Chisato Yamamoto
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