Abstract
Among animal societies, dominance is an important social factor that influences inter-individual relationships. However, assessing dominance hierarchy can be a time-consuming activity which is potentially impeded by environmental factors, difficulties in the recognition of animals, or disturbance of animals during data collection. Here we took advantage of novel devices, machines for automated learning and testing (MALT), designed primarily to study non-human primate cognition, to additionally measure the dominance hierarchy of a semi-free-ranging primate group. When working on a MALT, an animal can be replaced by another, which could reflect an asymmetric dominance relationship. To assess the reliability of our method, we analysed a sample of the automated conflicts with video scoring and found that 74% of these replacements included genuine forms of social displacements. In 10% of the cases, we did not identify social interactions and in the remaining 16% we observed affiliative contacts between the monkeys. We analysed months of daily use of MALT by up to 26 semi-free-ranging Tonkean macaques (Macaca tonkeana) and found that dominance relationships inferred from these interactions strongly correlated with the ones derived from observations of spontaneous agonistic interactions collected during the same time period. An optional filtering procedure designed to exclude chance-driven displacements or affiliative contacts suggests that the presence of 26% of these interactions in data sets did not impair the reliability of this new method. We demonstrate that this method can be used to assess the dynamics of both individual social status, and group-wide hierarchical stability longitudinally with minimal research labour. Further, it facilitates a continuous assessment of dominance hierarchies in captive groups, even during unpredictable environmental or challenging social events, which underlines the usefulness of this method for group management purposes. Altogether, this study supports the use of MALT as a reliable tool to automatically and dynamically assess dominance hierarchy within captive groups of non-human primates, including juveniles, under conditions in which such technology can be used.
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Acknowledgements
The authors are grateful to the University of Strasbourg and Silabe (https://silabe.com/) for supporting this research and providing expert animal care. We would also like to thank Adam Rimele for computer architecture and programming support. The MALT development was supported by the University of Strasbourg Institute for Advanced Study (USIAS) as part of a USIAS fellowship to HM. We also thank the editor and two anonymous reviewers for their insightful comments on an earlier version of this manuscript.
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Ballesta, S., Sadoughi, B., Miss, F. et al. Assessing the reliability of an automated method for measuring dominance hierarchy in non-human primates. Primates 62, 595–607 (2021). https://doi.org/10.1007/s10329-021-00909-7
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DOI: https://doi.org/10.1007/s10329-021-00909-7