cercocebus torquatus
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Animals ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 186
Author(s):  
Juliette Aychet ◽  
Noémie Monchy ◽  
Catherine Blois-Heulin ◽  
Alban Lemasson

Catarrhine primates gesture preferentially with their right hands, which led to the hypothesis of a gestural origin of human left-hemispheric specialization for language. However, the factors influencing this gestural laterality remain understudied in non-hominoid species, particularly in intraspecific contexts, although it may bring valuable insights into the proximate and ultimate causes of language lateralization. We present here a preliminary investigation of intraspecific gestural laterality in catarrhine monkeys, red-capped mangabeys (Cercocebus torquatus). We described the spontaneous production of brachio-manual intentional gestures in twenty-five captive subjects. Although we did not evidence any significant gestural lateralization neither at the individual- nor population-level, we found that mangabeys preferentially use their right hands to gesture in negative social contexts, such as aggressions, suggesting an effect of emotional lateralization, and that they adapt to the position of their receiver by preferentially using their ipsilateral hand to communicate. These results corroborate previous findings from ape studies. By contrast, factors related to gesture form and socio-demographic characteristics of signaler and receiver did not affect gestural laterality. To understand better the relationships between gestural laterality and brain lateralization from an evolutionary perspective, we suggest that the gestural communication of other monkey species should be examined with a multifactorial approach.


2021 ◽  
Vol 135 (1) ◽  
pp. 98-113
Author(s):  
Juliette Aychet ◽  
Catherine Blois-Heulin ◽  
Elisabetta Palagi ◽  
Alban Lemasson

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Juliette Aychet ◽  
Pablo Pezzino ◽  
Arnaud Rossard ◽  
Philippe Bec ◽  
Catherine Blois-Heulin ◽  
...  

2018 ◽  
Vol 117 (12) ◽  
pp. 3753-3759 ◽  
Author(s):  
Wenchao Yan ◽  
Kai He ◽  
Weifeng Qian ◽  
Tianqi Wang ◽  
Yu’an Zong ◽  
...  

2016 ◽  
Vol 283 (1835) ◽  
pp. 20161201 ◽  
Author(s):  
Sagan Friant ◽  
Toni E. Ziegler ◽  
Tony L. Goldberg

Parasites are ubiquitous in wildlife populations, but physiological and behavioural responses of hosts to infection are difficult to measure. We experimentally treated semi-free-ranging red-capped mangabeys ( Cercocebus torquatus ) in Nigeria with antiparasitic drugs and examined subsequent changes in glucocorticoid production and individual behaviour. Because both parasites and stress impact energy balance and health, we measured (i) behavioural time re-allocation via activity budgets, (ii) social relationships (e.g. social connectivity and dominance hierarchy stability) and (iii) body condition. We collected triplicate faecal samples ( n = 441) from 49 individuals prior to and following treatment. Cortisol levels fluctuated in parallel with parasite abundance. Elevations in cortisol, but not parasitism, were related to reduced body condition. Behaviour also shifted according to infection status, with uninfected individuals spending more time foraging and less time resting and vigilant compared with when they were infected. Time spent feeding, travelling or socializing did not differ between pre- and post-treatment time periods. Group cohesion, but not dominance stability, changed following treatment, suggesting parasite-induced social avoidance. Together, these findings show a coordinated response to infection that promotes host tolerance through stress and energy conservation, reduces transmission risk and increases protection when infected hosts are vulnerable.


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