PT  - JOURNAL ARTICLE
AU  - Kotrina Kajokaite
AU  - Andrew Whalen
AU  - Jeremy Koster
AU  - Susan Perry
TI  - Fitness benefits of providing services to others: Sociality predicts survival in a neotropical primate
AID  - 10.1101/2020.08.04.235788
DP  - 2020 Jan 01
TA  - bioRxiv
PG  - 2020.08.04.235788
4099  - http://biorxiv.org/content/early/2020/09/08/2020.08.04.235788.short
4100  - http://biorxiv.org/content/early/2020/09/08/2020.08.04.235788.full
AB  - Across multiple species of social mammals, evidence is accumulating that sociality is associated with fitness. In long-lived species, like primates, lifespan is one of the main fitness components. Here, we provide the first direct evidence that females who provide more in social services live longer. We used 18 years of data from the Lomas Barbudal Monkey project to quantify sociality in 11 capuchin (Cebus capucinus) social groups using three interaction types: grooming, support in coalitionary aggression, and foraging in close proximity. We analyzed each domain separately to understand how giving and receiving social favors predict survivorship. To estimate female sociality in each of these domains, we implemented an adaptation of the Social Relations Model. This approach enabled us to estimate individual rates of giving and receiving interactions while accounting for the inherent measurement uncertainty in these estimates due to varying amounts of observations of each individual. Subsequently, we modeled adult females’ survival as a function of their sociality estimates, rank, age, group size, and maternal kin presence using a Bayesian Cox proportional hazards model. We found that females who provide more grooming to other group members survive longer, but other social interaction types had little effect on survivorship.Competing Interest StatementThe authors have declared no competing interest.