Acculturation drives the evolution of intergroup conflict.
cultural evolution
group selection
intergroup conflict
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
09 07 2019
09 07 2019
Historique:
pubmed:
23
6
2019
medline:
31
3
2020
entrez:
23
6
2019
Statut:
ppublish
Résumé
Conflict between groups of individuals is a prevalent feature in human societies. A common theoretical explanation for intergroup conflict is that it provides benefits to individuals within groups in the form of reproduction-enhancing resources, such as food, territory, or mates. However, it is not always the case that conflict results from resource scarcity. Here, we show that intergroup conflict can evolve, despite not providing any benefits to individuals or their groups. The mechanism underlying this process is acculturation: the adoption, through coercion or imitation, of the victor's cultural traits. Acculturation acts as a cultural driver (in analogy to meiotic drivers) favoring the transmission of conflict, despite a potential cost to both the host group as a whole and to individuals in that group. We illustrate this process with a two-level model incorporating state-dependent event rates and evolving traits for both individuals and groups. Individuals can become "warriors" who specialize in intergroup conflicts, but are costly otherwise. Additionally, groups are characterized by cultural traits, such as their tendency to engage in conflict with other groups and their tendency for acculturation. We show that, if groups engage in conflicts, group selection will favor the production of warriors. Then, we show that group engagement can evolve if it is associated with acculturation. Finally, we study the coevolution of engagement and acculturation. Our model shows that horizontal transmission of culture between interacting groups can act as a cultural driver and lead to the maintenance of costly behaviors by both individuals and groups.
Identifiants
pubmed: 31227610
pii: 1810404116
doi: 10.1073/pnas.1810404116
pmc: PMC6628825
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
14089-14097Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
Références
Am Nat. 2003 Feb;161(2):181-205
pubmed: 12675367
Philos Trans R Soc Lond B Biol Sci. 2012 Mar 5;367(1589):670-9
pubmed: 22271783
Science. 2009 Jun 5;324(5932):1293-8
pubmed: 19498163
Behav Brain Sci. 2014 Jun;37(3):243-54
pubmed: 24970399
Proc Natl Acad Sci U S A. 2019 Jul 9;116(28):14089-14097
pubmed: 31227610
Q Rev Biol. 2007 Dec;82(4):327-48
pubmed: 18217526
Bull Math Biol. 2001 Sep;63(5):981-93
pubmed: 11565412
Genetica. 2008 Sep;134(1):99-111
pubmed: 18327647
Science. 2007 Oct 26;318(5850):636-40
pubmed: 17962562
Nat Commun. 2014 Mar 26;5:3526
pubmed: 24667443
PLoS One. 2011;6(7):e21437
pubmed: 21750712
Hum Nat. 2012 Mar;23(1):5-29
pubmed: 22388773
Trends Ecol Evol. 2016 Apr;31(4):315-326
pubmed: 26920473
Proc Biol Sci. 2008 Dec 22;275(1653):2877-85
pubmed: 18755675
Science. 1988 Feb 26;239(4843):985-92
pubmed: 17815700
Hum Nat. 2014 Dec;25(4):465-75
pubmed: 25056829
Proc Natl Acad Sci U S A. 2013 Oct 8;110(41):16384-9
pubmed: 24062433
J Theor Biol. 2003 Jul 21;223(2):135-47
pubmed: 12814597
Hum Nat. 2013 Dec;24(4):444-60
pubmed: 24008817
Evolution. 2013 Jun;67(6):1561-72
pubmed: 23730751
Proc Natl Acad Sci U S A. 2011 Jul 12;108(28):11375-80
pubmed: 21670285
Learn Behav. 2004 Feb;32(1):4-14
pubmed: 15161136
Proc Natl Acad Sci U S A. 1982 Apr;79(8):2628-31
pubmed: 6953419
Proc Natl Acad Sci U S A. 2015 Jan 13;112(2):348-53
pubmed: 25548190
Science. 2006 Dec 8;314(5805):1569-72
pubmed: 17158320
Behav Brain Sci. 2016 Jan;39:e1
pubmed: 26785995
Hum Nat. 2008 Jun;19(2):119-37
pubmed: 26181460
Trends Ecol Evol. 2007 Dec;22(12):643-51
pubmed: 17981363