Triadic interactions among Macaca radiata: Passports and buffers.

Area of Science:

• Primate behavior
• Social dynamics in mammals
• Animal sociology

Background:

• Male social hierarchies are often maintained through aggression.
• Infant caretaking (alloparenting) is observed in various primate species.
• Understanding the function of alloparenting can reveal insights into social bonding and conflict resolution.

Purpose of the Study:

• To investigate the role of male infant carrying in mediating social interactions and aggression in captive bonnet macaques (Macaca radiata).
• To determine if carrying infants influences the likelihood of harassment by higher-ranking males or during aggressive encounters.

Main Methods:

• Observational study of a captive group of Macaca radiata.
• Recording instances of male-infant interactions, including holding and carrying.
• Analyzing the frequency of these interactions in relation to social rank and aggressive encounters.
• Comparing interaction patterns involving male infants of different ages and sexes.

Main Results:

• Male bonnet macaques frequently held and carried infants, particularly during interactions with dominant males or when threatened.
• Male infants aged 25–84 weeks were more involved in these triadic interactions than other infants.
• Males carrying or embracing infants experienced less harassment from other males.

Conclusions:

• Infant carrying by male bonnet macaques serves as a strategy to mitigate aggression and harassment.
• The presence of infants acts as a social buffer, potentially signaling reduced threat or increasing the cost of aggression for dominant individuals.
• This behavior highlights the complex social functions of alloparenting in non-human primates.