Abstract
Songbirds learn to sing by modeling their songs on the songs of other males through a process of social learning. Models of social learning predict that animals should be selective in what and when they learn. In this study, we asked whether young males in a wild population of the Puget Sound white-crowned sparrow, Zonotrichia leucophrys pugetensis, were selective in their choice of tutor models and what factors influenced how accurately they imitated tutors’ songs. We first examined two strategies for tutor choice: whether pupils have a conformity bias and/or a preference for high-quality tutors. In keeping with a conformity bias, tutors that sang song types that were relatively common within a radius of about 500 m of their territory were more likely to be imitated than were tutors that sang rarer song types. Most potential tutors were not imitated by pupils. Aspects of tutor quality, such as age, pairing status, and survival to the next year had no effect on whether a tutor’s song was imitated. Secondly, we tested whether pupil repertoire size, pupil quality, and local abundance of tutor models affected the accuracy of song imitations. We found a trade-off between repertoire size and tutor imitation accuracy with males that sang two or more song types developing significantly poorer imitations than males that sang one type. We discuss possible functions of a conformity learning strategy and factors that could produce a trade-off between imitation accuracy and repertoire size.
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Acknowledgments
This work was funded by the National Science Foundation (IBN04-15842). We thank the Oregon State Parks Department, the staff at Bullard’s Beach State Park, and the Port of Bandon for granting permission to work on their properties. Karen Hallberg, Erin Lindstedt, Danielle Smith, and Robin Tarter analysed songs. Ian Hamilton, Henrik Brumm, and two reviewers made helpful comments on the manuscript.
Ethical standards
These observations were made in accordance with State of Oregon and United States laws. Procedures approved by Ohio State University IACUC Protocol 2000A005.
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Communicated by H. Brumm
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Nelson, D.A., Poesel, A. Tutor choice and imitation accuracy during song learning in a wild population of the Puget Sound white-crowned sparrow. Behav Ecol Sociobiol 68, 1741–1752 (2014). https://doi.org/10.1007/s00265-014-1782-z
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DOI: https://doi.org/10.1007/s00265-014-1782-z