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International Journal of Primatology

, Volume 36, Issue 2, pp 429–440 | Cite as

Role of Emitter and Severity of Aggression Influence the Agonistic Vocalizations of Geoffroy’s Spider Monkeys (Ateles geoffroyi)

  • José D. Ordóñez-GómezEmail author
  • Jacob C. Dunn
  • Víctor Arroyo-Rodríguez
  • María G. Méndez-Cárdenas
  • Alejandra Márquez-Arias
  • Ana M. Santillán-DohertyEmail author
Article

Abstract

Natural selection has resulted in the acoustic convergence of many animal vocalizations. During agonistic interactions vocalizations may vary depending on the role an individual plays in the interaction and on the severity of the attack. Motivation-structural rules describe how aggressors are thought to have evolved to use low-frequency vocalizations, whereas victims often use high-frequency vocalizations. This is because call frequency (Hz) is negatively related to body size across species. Motivational theory predicts that during more severe attacks, vocal structure will also change in response to increased arousal, leading to the production of noisy (high-entropy) vocalizations. Little is known about the acoustic characteristics of vocalizations produced during agonistic encounters in primates, and the limited available data are highly biased toward Old World species. Here, we evaluated the effect of the role of the emitter (aggressor or victim) and the severity of the behavior (with or without contact) on the acoustic parameters of 185 agonistic vocalizations emitted by 15 spider monkeys (Ateles geoffroyi) in two captive groups. Our results supported the predictions of both the motivation-structural rules and motivational theory: Call frequency (Hz) was lower in aggressors than in victims and lower during high-severity encounters than low-severity encounters. Further, average entropy was higher during high-severity encounters. These findings suggest that the agonistic vocalizations of spider monkeys convey information about both the role of the emitter and the severity of the interaction.

Keywords

Agonism Arousal Entropy Motivation-structural rules Motivational theory 

Notes

Acknowledgments

We thank to G. Castañeda-López, N. Arce-Peña, and J. Hernández-Meléndez for their important help in the field and Roger Mundry for providing instructions and scripts for the pDFA analysis. We also appreciate the support of the Posgrado en Ciencias Biológicas from the Universidad Nacional Autónoma de México and the Estación de Primatología from the Universidad Veracruzana. J. D. Ordóñez-Gómez was supported by a fellowship from the CONACyT and J. C. Dunn was supported by the Isaac Newton Trust. Finally, we thank Robert Seyfarth, Dorothy Cheney, two anonymous reviewers, and the editor-in-chief, Joanna Setchell for their very helpful suggestions and comments on previous versions of the manuscript.

Supplementary material

10764_2015_9833_MOESM1_ESM.doc (88 kb)
ESM 1 (DOC 88 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Posgrado en Ciencias BiológicasUniversidad Nacional Autónoma de MéxicoMexico CityMexico
  2. 2.Division of Biological AnthropologyUniversity of CambridgeCambridgeU.K.
  3. 3.Centro de Investigaciones en EcosistemasUniversidad Nacional Autónoma de MéxicoMoreliaMexico
  4. 4.Instituto de Investigaciones AntropológicasUniversidad Nacional Autónoma de MéxicoMexico CityMexico
  5. 5.NeurocienciasInstituto Nacional de Psiquiatría Ramón de la Fuente MuñizMexico CityMexico

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