Wild squirrel monkey (Saimiri sciureus) "caregiver" calls: Contexts and acoustic structure
Sue Boinski1,2, Carol L Mitchell3
1Department of Anthropology, University of Florida, Gainesville.
American Journal of Primatology
|January 12, 2020
Summary
Squirrel monkeys (Saimiri sciureus) use specialized "caregiver" calls to communicate with infants during nursing. Acoustic features of these calls vary significantly by nursing context, highlighting their importance in primate vocal behavior.
Area of Science:
- Primate Ethology
- Animal Vocal Communication
- Behavioral Ecology
Background:
- Squirrel monkeys (Saimiri sciureus) exhibit complex social structures and vocal repertoires.
- Parent-infant communication is crucial for primate development and survival.
- Previous research has not fully detailed the specific vocalizations related to nursing in squirrel monkeys.
Purpose of the Study:
- To analyze the acoustic structure of caregiver calls in wild adult female squirrel monkeys.
- To determine if acoustic features of caregiver calls differ across nursing contexts.
- To assess the significance of caregiver calls within the broader context of squirrel monkey vocal behavior.
Main Methods:
- Field study conducted in Parque Nacional del Manu, Peru.
- Observation and acoustic analysis of vocalizations from 22 wild adult female squirrel monkeys.
- Categorization of caregiver calls into prenurse, nurse, and end nurse contexts.
Main Results:
- Caregiver calls constituted 21% of all vocalizations recorded.
- Significant differences were found in start, end, and peak frequencies of caregiver calls across the three nursing contexts.
- Call duration did not significantly differ between contexts.
Conclusions:
- Squirrel monkey caregiver calls are acoustically distinct and context-specific, suggesting a high degree of specialization.
- The extensive use and development of these calls likely result from unique ecological and life history factors.
- These factors include delayed weaning, large infant size, foraging competition, predation risk, and habitat structure.
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