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2017 ; 3
(4
): e1601721
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Mandrills use olfaction to socially avoid parasitized conspecifics
#MMPMID28435875
Poirotte C
; Massol F
; Herbert A
; Willaume E
; Bomo PM
; Kappeler PM
; Charpentier MJE
Sci Adv
2017[Apr]; 3
(4
): e1601721
PMID28435875
show ga
The evolutionary transition from a solitary to a social lifestyle entails an
elevated parasite cost because the social proximity associated with group living
favors parasite transmission. Despite this cost, sociality is widespread in a
large range of taxonomic groups. In this context, hosts would be expected to have
evolved behavioral mechanisms to reduce the risk of parasite infection. Few
empirical studies have focused on the influence of pathogen-mediated selection on
the evolution of antiparasitic behavior in wild vertebrates. We report an
adaptive functional relationship between parasitism and social behavior in
mandrills, associated with evidence that they are able to gauge parasite status
of their group members. Using long-term observations, controlled experiments, and
chemical analyses, we show that (i) wild mandrills avoid grooming conspecifics
infected with orofecally transmitted parasites; (ii) mandrills receive
significantly more grooming after treatment that targets these parasites; (iii)
parasitism influences the host's fecal odors; and (iv) mandrills selectively
avoid fecal material from parasitized conspecifics. These behavioral adaptations
reveal that selecting safe social partners may help primates to cope with
parasite-mediated costs of sociality and that "behavioral immunity" plays a
crucial role in the coevolutionary dynamics between hosts and their parasites.