Higher songs of city birds may not be an individual response to noise

Sue Anne Zollinger, Peter J. B. Slater, Erwin Nemeth, Henrich Brumm

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46 Citations (Scopus)
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Abstract

It has been observed in many songbird species that populations in noisy urban areas sing with a higher minimum frequency than do matched populations in quieter, less developed areas. However, why and how this divergence occurs is not yet understood. We experimentally tested whether chronic noise exposure during vocal learning results in songs with higher minimum frequencies in great tits (Parus major), the first species for which a correlation between anthropogenic noise and song frequency was observed. We also tested vocal plasticity of adult great tits in response to changing background noise levels by measuring song frequency and amplitude as we changed noise conditions. We show that noise exposure during ontogeny did not result in songs with higher minimum frequencies. In addition, we found that adult birds did not make any frequency or song usage adjustments when their background noise conditions were changed after song crystallization. These results challenge the common view of vocal adjustments by city birds, as they suggest that either noise itself is not the causal force driving the divergence of song frequency between urban and forest populations, or that noise induces population-wide changes over a time scale of several generations rather than causing changes in individual behaviour.
Original languageEnglish
Article number20170602
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume284
Issue number1860
Early online date9 Aug 2017
DOIs
Publication statusPublished - 16 Aug 2017

Keywords

  • Urbanization
  • Vocal plasticity
  • Anthropogenic noise
  • Bird song
  • Animal communication

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