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Abstract # 1165 Event # 33:

Scheduled for Monday, June 26, 2006 03:00 PM-03:20 PM: Session 4 (Kama B)


Acoustic patterns of bark and howl sounds in chimpanzees (Pan troglodytes)

H. Rothgaenger
Charité-Universitätsmedizin Berlin, ZHGB, Institute of Medical Anthropology, Luisenstr. 57, Berlin 10117, Germany
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     The social behaviour between chimpanzees is regulated through many visual and acoustical signals. Current studies of sounds made by chimpanzees show different barks yet to date, their structure and meaning are unexplored. The wide range of barks have been divided into short barks, Hau-barks, howls and Wraa-barks. This study focuses on the Hau-barks and howls. Between 1999 and 2005, we recorded sounds from 32 chimpanzees at the Burgers` Zoo. 3000 sounds have been analysed. Barks account for 32% of all sounds made by the chimpanzees and Hau-bark and howl each account for 6 percent.  During attacks, chimpanzees emit Hau-barks. Hau-barks are loud, high frequency sounds with strong modulation of frequency that can be described on the phonetic impression as Hau/Wau or Wou. They are a typical intraspecific attack call with a mean fundamental frequency of 938 Hz and a mean duration of 252 ms. Howls are loud, largely constant calls with a mean fundamental frequency of 500 Hz and a mean duration of 301 ms. They are a signal to the community of alarm through internal disturbance or threatening. The phonetic impression is Ho and Hoo. Amongst separate calls and short series series with expiration and inspiration calls appear. They were named PO and POO.