Reduced injury risk links sociality to survival in a group-living primate
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Sociality has been linked to a longer lifespan in many mammals, including humans. Yet, how sociality results in survival benefits remains unclear. Using 10 years of data and over 1,000 recorded injuries in rhesus macaques (Macaca mulatta), we tested two injury-related mechanisms by which social status and affiliative partners might influence survival. Injuries increased individual risk of death by 3-fold in this dataset. We found that sociality can affect individuals’ survival by reducing their risk of injury but had no effect on the probability of injured individuals dying. Both males and females of high social status (measured as female matrilineal rank and male group tenure) and females with more affiliative partners (estimated using the number of female relatives) experienced fewer injuries and thus were less likely to die. Collectively, our results offer rare insights into one mechanism that can mediate the well-known benefits of sociality on an individual’s fitness.
Pavez-Fox , M A , Kimock , C M , Rivera-Barreto , N , Negron-Del Valle , J E , Phillips , D , Ruiz-Lambides , A , Snyder-Mackler , N , Higham , J P , Siracusa , E R & Brent , L J N 2022 , ' Reduced injury risk links sociality to survival in a group-living primate ' , iScience , vol. 25 , no. 11 , 105454 . https://doi.org/10.1016/j.isci.2022.105454
Copyright 2022 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
DescriptionFunding: This work was supported by ANID-Chilean scholarship [number 72190290], the National Institutes of Health [grant R01AG060931 to N.S-M., L.J.N.B., and J.P.H., R00AG051764to N.S-M], a European Research Council Consolidator Grant to L.J.N.B. [Friend Origins - 864461], a MacCracken Fellowship to C.M.K., and a National Science Foundation Doctoral Dissertation Research Improvement Grant to C.M.K. . The CPRC is supported by the National Institutes of Health. An Animal and Biological Material Resource Center Grant [P40OD012217] was awarded to the UPR from the Office of Research Infrastructure Programs, National Institutes of Health (ORIP). A Research Facilities Construction Grant [C06OD026690] and an NSF grant to J.P.H.  were awarded for the renovation of CPRC facilities after Hurricane Maria.
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