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Journal of BirdLife Australia
RESEARCH ARTICLE

Temporal change of the song of a local population of the Grey Warbler (Gerygone igata): has its song changed over time?

Joseph F. Azar A C , Ben D. Bell A and Marta Borowiec B
+ Author Affiliations
- Author Affiliations

A Centre for Biodiversity & Restoration Ecology, School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6041, New Zealand.

B Museum of Natural History, University of Wroclaw, Sienkiewicza 21, PL-50-335 Wroclaw, Poland.

C Corresponding author. Email: azar.joseph@gmail.com

Emu 114(1) 80-85 https://doi.org/10.1071/MU13039
Submitted: 20 March 2013  Accepted: 17 July 2013   Published: 10 October 2013

Abstract

The songs of bird species can vary from place to place and such variation may reflect ecological heterogeneity within the habitat. However, there is little understanding of how this process occurs over time within the same population. Here, change in song over time in a local population of the New Zealand Grey Warbler (Gerygone igata) was investigated. Spectral and temporal aspects of the song were compared in the same population at an interval of 7 years (2002 and 2009). There was a significant shift in the song syllables to a higher frequency but no difference in the temporal structure of the song. The frequency difference in song suggests that interspecific interactions may have led to song-frequency displacement, which in turn may be caused by the reintroduction of other native species to the study area.

Additional keyword: bird song.


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