Abstract
Birdsong evolution has influenced by various ecological and social factors. When related species that sing similar songs coexist, the acoustic properties of the songs of one or both species may shift, and the songs may diverge. We investigated geographic variation in the songs of the Japanese tit (Parus minor) and the varied tit (Poecile varius) in the Ryukyu Archipelago, Japan, whose islands harbor either one or both species. The songs of the two species exhibited similar structure, but acoustic measurements differed between them. For example, varied tits sang songs at higher frequency than Japanese tits did. The songs of both species varied geographically. At sites with higher relative densities of varied tits, Japanese tits sang lower frequency songs, indicating that in areas of coexistence, Japanese tits sang songs that had acoustically diverged from those of varied tits. Song variation in varied tits was not related to sympatry with Japanese tits. These asymmetric results suggest that the subordinate Japanese tit modified the acoustic characteristics of its song to avoid harassment by the dominant varied tit. We observed no effects of genetic divergence or local intraspecific density on Japanese tit or varied tit songs. This study used geographic variation to examine hypotheses of song evolution, and the results highlight the importance of character displacement.
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Acknowledgments
We thank T. Mizuta, H. Torikai, and the Amami Wildlife Conservation Center for their help in the field. Genetic analyses were supported by the staff of the Center for Molecular Biodiversity Research, National Museum of Nature and Science, Tokyo. Two anonymous reviewers provided helpful comments on the manuscript. This study was financially supported by the National Museum of Nature and Science (project “Integrated Research on Biodiversity of Interspecies Relationships”) and a JSPS Grant-in-Aid for Scientific Research (C) (No. 24570119).
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Hamao, S., Sugita, N. & Nishiumi, I. Geographic variation in bird songs: examination of the effects of sympatric related species on the acoustic structure of songs. acta ethol 19, 81–90 (2016). https://doi.org/10.1007/s10211-015-0228-6
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DOI: https://doi.org/10.1007/s10211-015-0228-6