title: Contingent cooperation between wild female baboons.
abstract: The apparent rarity of contingent cooperation in animals has convinced many investigators that such reciprocity is unimportant, stimulating consideration of alternative explanations for cooperation, such as by-product mutualism and biological markets motivated by the likelihood of immediate reward. Nevertheless, there is also limited evidence that animals do sometimes rely on memory of recent interactions when behaving altruistically toward others. Here we describe a playback experiment conducted on wild female baboons, suggesting that contingent cooperation may occur among unrelated individuals, even when there is a temporal delay between the two cooperative acts. Hearing the recruitment call of an unrelated recent grooming partner caused subjects to move in the direction of the loudspeaker and approach their former partner, particularly when this partner had an infant. When the subject and her partner were close kin no such effect was observed. Subjects' responses were not influenced by any type of recent interaction, because prior grooming and prior aggression influenced their behavior in qualitatively different ways. Similarly, their responses were not prompted only by the motivation to resume friendly interactions, because prior grooming alone did not elicit approach. Instead, subjects were most likely to approach their former grooming partner when they had also heard her recruitment call. Results suggest that at least some forms of cooperation in animals may be based on memory of specific recent interactions.
authors.affiliation: Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA. cheney@sas.upenn.edu
authors.forename: Dorothy L
authors.initials: DL
authors.lastname: Cheney
authors.forename: Liza R
authors.initials: LR
authors.lastname: Moscovice
authors.forename: Marlies
authors.initials: M
authors.lastname: Heesen
authors.forename: Roger
authors.initials: R
authors.lastname: Mundry
authors.forename: Robert M
authors.initials: RM
authors.lastname: Seyfarth
mesh_terms: D000819:Animal Communication; D000818:Animals; D001307:Auditory Perception; D003299:Cooperative Behavior; D005260:Female; D008297:Male; D008568:Memory; D048529:Papio hamadryas / Q000502:physiology*
references.citation: J Comp Psychol. 2007 May;121(2):181-8
references.pmid: 17516796
references.citation: Proc Biol Sci. 2009 Feb 22;276(1657):699-706
references.pmid: 18957365
references.citation: Anim Cogn. 2009 Jul;12(4):587-97
references.pmid: 19259709
references.citation: Behav Ecol Sociobiol. 2010 Nov;64(11):1733-1747
references.pmid: 20976293
references.citation: Science. 2006 Mar 3;311(5765):1297-300
references.pmid: 16513985
references.citation: Behav Ecol. 2009 Jan;20(1):200-206
references.pmid: 19337589
references.citation: Anim Behav. 2000 Aug;60(2):253-261
references.pmid: 10973728
references.citation: Trends Cogn Sci. 2004 Feb;8(2):60-5
references.pmid: 15588809
references.citation: Am J Primatol. 1987;12(3):287-298
references.pmid: 31973494
references.citation: Am J Primatol. 2009 Oct;71(10):840-51
references.pmid: 19475543
references.citation: Science. 2003 Nov 14;302(5648):1231-4
references.pmid: 14615543
references.citation: Behaviour. 1974;49(3):227-67
references.pmid: 4597405
references.citation: Am J Primatol. 2009 Feb;71(2):101-5
references.pmid: 19025780
references.citation: Nature. 2009 Nov 5;462(7269):51-7
references.pmid: 19890322
references.citation: Proc Biol Sci. 2002 Sep 22;269(1503):1925-9
references.pmid: 12350255
references.citation: Proc Biol Sci. 2009 Sep 7;276(1670):3099-104
references.pmid: 19515668
references.citation: Proc Biol Sci. 2007 Apr 22;274(1613):1109-15
references.pmid: 17301022
references.citation: Proc Natl Acad Sci U S A. 2009 Jul 21;106(29):12007-12
references.pmid: 19581578
references.citation: Anim Behav. 1997 Aug;54(2):409-18
references.pmid: 9268473
references.citation: Nature. 1984 Apr 5-11;308(5959):541-3
references.pmid: 6709060
references.citation: Philos Trans R Soc Lond B Biol Sci. 2007 Apr 29;362(1480):561-75
references.pmid: 17255006
references.citation: Am J Primatol. 1985;8(1):37-52
references.pmid: 31986822