TY - JOUR
T1 - Correlates of individual participation in boundary patrols by male chimpanzees
AU - Massaro, Anthony P.
AU - Gilby, Ian C.
AU - Desai, Nisarg
AU - Weiss, Alexander
AU - Feldblum, Joseph T.
AU - Pusey, Anne E.
AU - Wilson, Michael L.
N1 - Funding Information:
Agence Nationale de la Recherche (ANR-17-EURE-0010), Arcus Foundation, Arizona State University, Carnegie Corporation of New York, Duke University, Jane Goodall Institute, Leakey Foundation, Leo S. Guthman Foundation, Margo Marsh, National Geographic Society, U.S. Department of Health and Human Services, National Institutes of Health (R00 HD057992, R01 AI050529, R01 AI120810), National Science Foundation (BCS-0452315, BCS-0648481, BCS-1743506, BCS-1753437, DBS-9021946, IOS-1052693, IOS-1457260, SBR-9319909), the Harris Steel Group, University of Minnesota, Wilkie Foundation, William T. Grant Foundation, Windibrow Foundation.
Publisher Copyright:
© 2022 Royal Society Publishing. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Group territory defence poses a collective action problem: individuals can freeride, benefitingwithout payingthe costs. Individual heterogeneity has been proposed to solve such problems, as individuals high in reproductive success, rank, fighting ability or motivation may benefit from defending territories even if others free-ride. To test this hypothesis,we analysed 30 years of data fromchimpanzees (Pan troglodytes) in the Kasekela community, Gombe National Park, Tanzania (1978 2007).We examinedthe extent towhichindividualparticipation in patrols varied according to correlates of reproductive success (mating rate, rank, age), fighting ability (hunting), motivation (scores from personality ratings), costs of defecting (the number of adult males in the community) and gregariousness (sighting frequency). By contrast to expectations from collective action theory, males participated in patrols at consistently high rates (mean ± s.d. = 74.5 ± 11.1% of patrols, n = 23males). The best predictors of patrol participation were sighting frequency, age and hunting participation. Current and former alpha males did not participate at a higher rate than males that never achieved alpha status. These findings suggest that the temptation to free-ride is low, and that a mutualistic mechanism such as group augmentation may better explain individual participation in group territorial behaviour.
AB - Group territory defence poses a collective action problem: individuals can freeride, benefitingwithout payingthe costs. Individual heterogeneity has been proposed to solve such problems, as individuals high in reproductive success, rank, fighting ability or motivation may benefit from defending territories even if others free-ride. To test this hypothesis,we analysed 30 years of data fromchimpanzees (Pan troglodytes) in the Kasekela community, Gombe National Park, Tanzania (1978 2007).We examinedthe extent towhichindividualparticipation in patrols varied according to correlates of reproductive success (mating rate, rank, age), fighting ability (hunting), motivation (scores from personality ratings), costs of defecting (the number of adult males in the community) and gregariousness (sighting frequency). By contrast to expectations from collective action theory, males participated in patrols at consistently high rates (mean ± s.d. = 74.5 ± 11.1% of patrols, n = 23males). The best predictors of patrol participation were sighting frequency, age and hunting participation. Current and former alpha males did not participate at a higher rate than males that never achieved alpha status. These findings suggest that the temptation to free-ride is low, and that a mutualistic mechanism such as group augmentation may better explain individual participation in group territorial behaviour.
KW - Pan troglodytes
KW - boundary patrols
KW - collection action problems
KW - hunting
KW - intergroup aggression
KW - territorial behaviour
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U2 - 10.1098/rstb.2021.0151
DO - 10.1098/rstb.2021.0151
M3 - Article
C2 - 35369753
AN - SCOPUS:85127465619
VL - 377
JO - Philosophical Transactions of the Royal Society B: Biological Sciences
JF - Philosophical Transactions of the Royal Society B: Biological Sciences
SN - 0800-4622
IS - 1851
M1 - 20210151
ER -