Integrative personality assessment in wild Assamese macaques (Macaca assamensis)

Area of Science:

• Behavioral Ecology
• Animal Behavior
• Primatology

Background:

• Individual differences in behavior are consistent over time in nonhuman animals, similar to human personality.
• Studying behavior traits in the wild is crucial for understanding their adaptive value under ecological pressures.

Purpose of the Study:

• To investigate stable interindividual differences in behavior and personality in wild Assamese macaques.
• To explore the construct validity and reliability of personality assessments in a species-typical ecological setting.

Main Methods:

• A multimethod approach combining trait ratings (TRs) using the Hominoid Personality Questionnaire and behavior codings (BCs).
• Data collected from 107 Assamese macaques of diverse age-sex classes and 24 adult males in Phu Khieo Wildlife Sanctuary, Thailand.

Main Results:

• Male and female personality constructs were found to be congruent.
• Two five-factor solutions emerged for male personality structure, integrating trait ratings and behavioral codings.
• Identified dimensions included Gregariousness, Aggressiveness, Sociability, Vigilance, Confidence, Opportunism, and Friendliness.

Conclusions:

• The study highlights the importance of construct validity and reproducibility in developing standardized methods for nonhuman animal personality research.
• Findings contribute to understanding personality structure in wild primates and the methodologies used to assess it.