Abstract
In an eastern population of song sparrows (Melospiza melodia), song type matching occurs at above chance levels but does not signal aggressiveness. One explanation for the apparent ineffectiveness of matching as a signal is that the occurrence of matching is constrained by internal rules for ordering the production of song types. This constraint hypothesis is tested here in an experiment in which the singing of territorial male song sparrows is monitored in the field in real time, and subjects are confronted with playback of one of their song types either immediately after switching away from that type (short-delay) or after having cycled through much of their repertoire since last singing that type (long-delay). Matching was not significantly more likely in the long-delay treatment than in the short-delay treatment. The probability of matching did, however, depend significantly on prior bout length: the longer was a singer’s last bout of a song type, the less likely the singer was to match it. There was also a suggestive effect of frequency of usage: males were more likely to match a song type the more frequently they normally sang that type, though this result was not significant after correcting for multiple comparisons. Thus, internal rules on how songs are sequenced exert constraints on the occurrence of song type matching, and such constraints can help to explain the apparent ineffectiveness of matching as a signal in this study population.
Significance statement
Research on song type matching in songbirds has largely focused on the signal function of matching, especially on the hypothesis that matching serves as an aggressive signal directed at the matched individual. In some songbirds, however, such as our study population of eastern song sparrows, predictions of the aggressive signaling hypothesis are not supported. Here, we show that the probability that song sparrows match song playback is strongly influenced by internal rules governing the sequencing of song type production. Specifically, the probability that song sparrows will match a particular song type is inversely related to the length of their prior bout of that song type. This result demonstrates how internal syntactical rules governing song type sequencing can constrain the signal function of song type matching.
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Acknowledgments
We thank Cori Richards-Zawacki and the staff of the University of Pittsburgh’s Pymatuning Laboratory of Ecology for logistical support and the Pennsylvania Game Commission for access to study sites. We thank the Associate Editor and two anonymous reviewers for their comments. We are grateful to Susan Peters for performing the independent judging of song type matching and to Karla Rivera-Cáceres for help with the GLMMs.
Funding
Financial support was provided by the Robert E. Maytag Research Fund of the University of Miami and the Duke University Office of the Provost.
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All procedures used in this study were approved by the Institutional Animal Care and Use Committees of the University of Miami (protocol no. 17–046), Duke University (protocol no. A004-17-01) and the University of Pittsburgh (protocol no. 15045539). All applicable national and institutional guidelines for the use of animals were followed. Playback trials were kept brief (≤3 min) to minimize disturbance to our subjects.
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Searcy, W.A., Ocampo, D. & Nowicki, S. Constraints on song type matching in a songbird. Behav Ecol Sociobiol 73, 102 (2019). https://doi.org/10.1007/s00265-019-2708-6
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DOI: https://doi.org/10.1007/s00265-019-2708-6