Relatedness decreases and reciprocity increases cooperation in Norway rats. Issue 1874 (7th March 2018)

• Record Type: Journal Article
• Authors: Schweinfurth, Manon K.; Taborsky, Michael
• Is Part Of: Proceedings. Volume 285:Issue 1874(2018)
• Publication Date: 2018-03-07
• Subjects: reciprocity -- kin selection -- Norway rats -- cooperation -- iterated Prisoner's dilemma; Biology -- Periodicals; 570.5
• DOI: 10.1098/rspb.2018.0035
• Languages: English
• ISSNs: 0962-8452

Abstract

Abstract : Kin selection and reciprocity are two mechanisms underlying the evolution of cooperation, but the relative importance of kinship and reciprocity for decisions to cooperate are yet unclear for most cases of cooperation. Here, we experimentally tested the relative importance of relatedness and received cooperation for decisions to help a conspecific in wild-type Norway rats ( Rattus norvegicus ). Test rats provided more food to non-kin than to siblings, and they generally donated more food to previously helpful social partners than to those that had refused help. The rats thus applied reciprocal cooperation rules irrespective of relatedness, highlighting the importance of reciprocal help for cooperative interactions among both related and unrelated conspecifics.