The evolution of food calls : vocal behaviour of sooty mangabeys in the presence of food
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The two main theories of food-associated calls in animals propose functions either in cooperative recruitment or competitive spacing. However, not all social animals produce food calls and it is largely unclear under what circumstances this call type evolves. Sooty mangabeys (Cercocebus atys) do not have food calls, but they frequently produce grunts during foraging, their most common vocalisation. We found that grunt rates were significantly higher when subjects were foraging in the group’s periphery and with small audiences, in line with the cooperative recruitment hypothesis. In a subsequent field experiment we presented highly desired food items and found that discovering individuals called, unless harassed by competitors, but that the calls never attracted others, confirming that the grunts do not convey any information referential to food. Our data thus suggest that the evolution of cooperative food calling is a two-step process, starting with increased motivation to vocalise in the feeding context, followed by the evolution of acoustic variants derived from context-general contact calls. This evolutionary transition may only occur in species that feed on clumped, high-quality resources where social feeding is competitive, a condition not met in sooty mangabeys.
Quintero , F , Touitou , S , Magris , M & Zuberbühler , K 2022 , ' The evolution of food calls : vocal behaviour of sooty mangabeys in the presence of food ' , Frontiers in Psychology , vol. 13 , 897318 . https://doi.org/10.3389/fpsyg.2022.897318
Frontiers in Psychology
Copyright © 2022 Quintero, Touitou, Magris and Zuberbühler. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DescriptionFunding: This research was funded by the Swiss National Science Foundation (310030_143359; NCCR Evolving Language, Swiss National Science Foundation Agreement #51NF40_180888) and the European Research Council (PRILANG GA283871).
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