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Small apes adjust rhythms to facilitate song coordination.

Haigang Ma1, Zidi Wang1, Pu Han1

  • 1School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China.

Current Biology : CB
|January 24, 2024
PubMed
Summary

Male gibbons adjust their song rhythm to coordinate with female great calls. Faster, more isochronous rhythms signal successful coordination, offering insights into the evolution of musical communication.

Keywords:
isochronous (1:1 ratios) rhythmspolygynous Nomascus gibbonsrhythm adjustmentsmall-integer rhythmssong coordination

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Area of Science:

  • Ethology
  • Bioacoustics
  • Evolutionary Biology

Background:

  • Song coordination is a key feature of human music and is observed in various animal vocalizations, including duets and choruses.
  • The mechanisms and evolutionary pathways of song coordination in animals are areas of recent scientific interest.
  • Polygynous Nomascus gibbons exhibit coordinated vocalizations, with males singing solo sequences and females responding with great calls.

Purpose of the Study:

  • To investigate the role of rhythm in facilitating song coordination between male and female Nomascus gibbons.
  • To test the hypothesis that male song rhythm is adjusted to enhance coordination with female great calls.
  • To explore how variations in rhythm predictability influence the success of female vocal responses.

Main Methods:

  • Analysis of vocalizations from three closely related Nomascus gibbon species living in polygynous groups.
  • Quantification of rhythm characteristics (isochrony, tempo) in male solo sequences preceding female great calls.
  • Comparison of rhythmic patterns in successful versus unsuccessful female great call sequences.

Main Results:

  • Adult male gibbons produced significantly more isochronous rhythms and faster tempos in sequences followed by successful female great calls.
  • The Nomas concolor species showed smaller differences in isochrony and tempo between male sequences and successful female calls, potentially hindering prediction.
  • Nomas concolor females exhibited a higher rate of failed great calls (incomplete sequences) compared to other species studied.

Conclusions:

  • Male gibbon song rhythm plays a crucial role in achieving successful vocal coordination with females.
  • Rhythmic adjustments, including increased isochrony and tempo, serve as signals for effective communication.
  • Gibbon vocal coordination provides a valuable model for understanding the evolutionary origins of rhythm in music and communication.