Embracing in a female-bonded monkey species (Theropithecus gelada)

Area of Science:

• Ethology
• Primatology
• Behavioral Ecology

Background:

• Embracing is a behavior observed across primate species, including humans, and is linked to affiliative relationships.
• The gelada monkey (Theropithecus gelada) lives in female-bonded societies where female relationships are crucial for group integrity.
• Understanding embracing in geladas can provide insights into the evolution of social bonding and affiliation in primates.

Purpose of the Study:

• To investigate the functional meaning and social significance of embracing in the female-bonded gelada monkey.
• To determine if different types of embraces correlate with the quality of social relationships between individuals.
• To explore the role of embracing in maternal behavior and group cohesion within gelada society.

Main Methods:

• Observation of a study group of Theropithecus gelada to record instances and types of embracing.
• Categorization of embracing behaviors into three distinct types: frontal, side, and posterior embraces.
• Analysis of the relationship between the type of embrace and the social bond quality between individuals, with a focus on females and mothers.

Main Results:

• Frontal and side embraces were significantly more frequent between females with strong social bonds, indicating their role in affiliative interactions.
• Posterior embracing was observed to be randomly distributed among individuals, suggesting a different or less specific function.
• A high frequency of embracing was noted among mothers during early lactation, potentially increasing female cohesiveness and reducing infanticide risk.

Conclusions:

• Embracing in geladas is a nuanced affiliative strategy, with specific embrace types reflecting relationship quality.
• Female embracing, especially among mothers, may serve to enhance group cohesion and mitigate social threats like infanticide.
• Embracing behaviors contribute to maintaining social integrity and strong female bonds within the gelada social structure.