Abstract
Recent studies suggest that songbird communication is negatively affected by anthropogenic noise. However, much of the current literature focuses on inter- and intra-sexual communication. Songbirds also use acoustic cues for many other functional behaviors. One example associated with fitness consequences is the identification of predatory threats through acoustic cues. To test the effect of anthropogenic noise on detection of acoustic cues, we compared the rates of seven anti-predator behavioral responses in urban dwelling songbirds foraging at bird feeders when exposed to playback of calls from predatory Cooper’s hawks under quiet conditions, and when overlapped with road noise. Only a single behavior, freeze response, decreased significantly when calls were overlapped with noise. However, freeze responses occurred in only a small percentage of playback trials, raising some question regarding the biological relevance of this observed difference. Overall, our results suggest that common urban songbirds are relatively successful at perceiving acoustic signals associated with predator presence. Whether this ability is commonplace amongst songbird species is unknown and warrants additional study. However, if this trait is not widespread, it may be an additional characteristic determining which bird species can inhabit noisy areas.
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Acknowledgments
This research was funded through an equipment grant from the Cargill Fund (DSP) and through support from the Calvin College Science Division (DSP, DP, JK). Research was approved by and conducting under the guidelines set forth by the Calvin College Institutional Animal Care and Use Committee. We would like to thank the many members of the greater Grand Rapids community who graciously allowed us to utilize their bird feeding stations in this study. We would also like the editorial staff and an anonymous reviewer for helpful comments on the manuscript.
Compliance with Ethical Standards
This paper was produced in accordance with the ethical standards set forth by Urban Ecosystems. No animals were harmed as a result of this experiment and all procedures were approved by the Calvin College Institutional Animal Care and Use Committee. Funding sources were from the Cargill Grant and Calvin College Science Division, and the authors declare that they have no conflict of interest. Lastly, all authors contributed substantially to all aspects of the work and are fully informed of the current submission to Urban Ecosystems.
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Species-specific results broken down by treatment (noise/quiet). Each behavior is treated separately. Flight scores range between 0 and 3, with higher numbers representing more immediate departure from the feeder upon playback. Pecks is presented as the mean number of pecks after playback. The remaining behaviors are represented as presence/absence (0–1, with higher scores representing greater presence of the behavior). Where sufficient sample size and deviation allowed, t-test results are presented. (XLSX 15 kb)
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Pettinga, D., Kennedy, J. & Proppe, D.S. Common urban birds continue to perceive predator calls that are overlapped by road noise. Urban Ecosyst 19, 373–382 (2016). https://doi.org/10.1007/s11252-015-0498-9
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DOI: https://doi.org/10.1007/s11252-015-0498-9