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Dialects in wild chimpanzees?

John C Mitani1, Toshikazu Hasegawa2, Julie Gros-Louis1

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|January 17, 2020
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Summary

Chimpanzee pant hoot calls show subtle geographic variations between Mahale and Gombe populations. These differences in call structure may be influenced by vocal learning, in addition to other factors.

Keywords:
chimpanzeeslearningvocalizations

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Area of Science:

  • Primatology
  • Bioacoustics
  • Animal Communication

Background:

  • Chimpanzees (Pan troglodytes) produce a distinctive long-distance vocalization called the pant hoot.
  • Understanding geographic variation in animal vocalizations is crucial for studying evolutionary and ecological factors shaping communication.

Purpose of the Study:

  • To investigate acoustic differences in pant hoot calls between chimpanzee populations in Mahale and Gombe Stream National Parks, Tanzania.
  • To explore potential factors contributing to observed vocal variations, including the role of vocal learning.

Main Methods:

  • Acoustic analysis of pant hoot calls from chimpanzees in Mahale and Gombe.
  • Comparison of six specific acoustic features between the two populations.

Main Results:

  • Subtle but distinct acoustic differences were identified in pant hoot calls between Mahale and Gombe chimpanzees.
  • Mahale chimpanzees exhibited faster element rates and shorter elements in certain call sections compared to Gombe chimpanzees.
  • Mahale individuals produced broader-band, higher-pitched climax elements than Gombe males.

Conclusions:

  • Geographic variation exists in chimpanzee pant hoot calls, with Mahale and Gombe populations displaying unique acoustic characteristics.
  • While genetic, anatomical, or environmental factors may contribute, vocal learning is proposed as a significant factor influencing these observed differences.