Witness for resolution: post-conflict quadratic affiliation in semi-free ranging pigs  

作　　者：Ivan Norscia Edoardo Collarini Carlo Robino Elena Chierto Giada Cordoni 

机构地区：[1]Department of Life Sciences and Systems Biology,University of Torino,Via Accademia Albertina 13,10123 Torino,Italy [2]Department of Public Health Sciences and Pediatric s,University of Torino,C.So Galileo Galilei 22,10126 Torino,Italy

出　　处：《Current Zoology》2024年第2期233-243,共11页动物学报（英文版）

基　　金：Funding was provided to I.N.by Department of Life Sciences and Systems Biology(DBIOS);University of Torino,Italy(Grant No.NORI_RILO_18_01);PON Green oriented PhD grant to E.C.(Action IV.5,Ministry Decree 1061/2021,FSE-REACT-EU funds).

摘　　要：In social mammals,post-conflict resolution can involve the reunion of former opponents(reconciliation),spontaneous/solicited post-conflict affliation of a third party with either opponent(triadic contacts),and affiliation between other individuals(hereafter bystanders;quadratic contacts).Quadratic contacts-possibly informing complex cognitive abilities-have been neglected in post-conflict studies.We investi-gated quadratic affliation in semi-free ranging pigs Sus scrofa,at the ethical farm Parva-Domus(Cavagnolo,Italy).Kinship was known.We collected behavioral data on adult pigs(n=104)via video recordings(43 h)followed by video analyses.Affiliative and anxiety behaviors between bystanders were collected under post-conflict(PC;following a conflict between non-bystanders)and matched-control(MC;no conflict)conditions.Quadratic affiliation was present in pigs,as bystanders affliated more in PC than MC,and such affiliation was followed by a decrease in the anxiety behaviors of both the interacting bystanders.Thus,quadratic contacts may be partly aimed at reducing one's own anxiety(intrinsic regulation).Quadratic affiliation was highest between closely related bystanders,which suggests that such affiliation may be most effective when close kin is involved.Quadratic affiliation was lowest after reconciliation and spontaneous triadic contacts.This suggests that direct peacemaking between opponents and spontaneous triadic contacts with close kin may most likely replace quadratic affiliation.Hence,pigs can be influenced by the negative events that affect other pigs-but not themselves-and their response may be modulated by social factors.Such non-random quadratic affiliation may point toward the presence of elements of social appraisal abilities inpigs.

关 键 词：anxiety reduction emotional regulation RECONCILIATION social appraisal triadic contacts. 

分 类 号：Q95[生物学—动物学]