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2016 ; 283
(1843
): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Female monkeys use both the carrot and the stick to promote male participation in
intergroup fights
#MMPMID27881752
Arseneau-Robar TJ
; Taucher AL
; Müller E
; van Schaik C
; Bshary R
; Willems EP
Proc Biol Sci
2016[Nov]; 283
(1843
): ä PMID27881752
show ga
Group-level cooperation often poses a social dilemma in which joint action may be
difficult to achieve. Theoretical models and experimental work on humans show
that social incentives, such as punishment of defectors and rewarding of
cooperators, can promote cooperation in groups of unrelated individuals. Here, we
demonstrate that these processes can operate in a non-human animal species, and
be used to effectively promote the production of a public good. We took advantage
of the fact that intergroup fights in vervet monkeys (Chlorocebus aethiops
pygerythrus) are characterized by episodes of intergroup aggression with pauses
in-between. During pauses, females selectively groomed males that had
participated in the previous aggressive episode, but aggressed male group members
that had not. In subsequent (i.e. future) episodes, males who had received either
aggression or grooming participated above their personal base-line level.
Therefore, female-male aggression and grooming both appear to function as social
incentives that effectively promote male participation in intergroup fights.
Importantly, females stood to gain much from recruiting males as the probability
of winning intergroup fights was dependent on the number of active participants,
relative to the number of fighters in the opposing group. Furthermore, females
appear to maximize the benefits gained from recruiting males as they primarily
used social incentives where and when high-quality food resources, which are the
resources primarily limiting to female fitness, were at stake.