Abstract
Wild chimpanzees (Pan troglodytes) produce low-frequency sounds by hitting the buttresses and/or trunks of trees. This “buttress drumming” occurs in discrete bouts that may be integrated into the phrase sequence of the chimpanzee’s long-distance vocalization, the “pant hoot.” The aim of this study was to investigate whether regional variation exists in the drumming behavior of male chimpanzees from Kibale National Park (Kanyawara community), Uganda, and Taï National Park, Ivory Coast. Recordings were made during a 6-month field season at Taï in 1990, and a 12-month field season at Kanyawara in 1996–1997. Acoustic analysis revealed the following: (1) Kanyawara males drummed significantly less frequently in conjunction with a pant hoot or hoot than did Taï males; (2) drumming bouts by Kanyawara males included significantly fewer beats, and were significantly shorter in duration, than those of Taï males; these differences disappeared when only those bouts produced in conjunction with a call were compared; (3) when Kanyawara chimpanzees did call and drum together, they tended to integrate drumming into the vocalization at a later point than did Taï males; and (4) individual differences in the temporal patterning of drumming bouts were not apparent for Kanyawara males, whereas a previous analysis revealed individual differences among Taï males.





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Acknowledgements
Invaluable logistical support at Kibale was provided by R.W. Wrangham and the Kibale Chimpanzee Project staff. C. Katongole and C. Muruuli helped to find, identify, and follow the chimpanzees. Funding for the Kibale research was provided by the National Geographic Society (no. 5626–96). We thank Makerere University for permission to conduct research at MUBFS, G. Isabirye-Basuta and J. Kasenene for logistical support there, and the Uganda Wildlife Authority for permission to work in the Kibale National Forest. We are indebted to L. Bello for transcribing the Kibale field tapes and digitizing the drumming bouts. We thank the Ministère de la Recherche Scientifique and the Ministère des Eaux et Forêts of the Ivory Coast for accepting this project and the Swiss National Science Foundation for financially supporting D.R. This project was part of the Man and Biosphere UNESCO project under the supervision of Dr. H. Dosso. Much gratitude goes to C. Boesch for invaluable support and for sharing his experience of Taï. Many thanks are also due to G. Nohon, Q. Gouyan, E. Jagger and Dr. C. Steiner for their encouraging support and contribution to data collection, and to the Director of the Centre Suisse de Recherches Scientifiques and the staff of the Station IET at Taï for their logistic support.
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Clark Arcadi, A., Robert, D. & Mugurusi, F. A comparison of buttress drumming by male chimpanzees from two populations. Primates 45, 135–139 (2004). https://doi.org/10.1007/s10329-003-0070-8
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DOI: https://doi.org/10.1007/s10329-003-0070-8


