Data from: Maturational changes in song sparrow song


  • Age-related changes in the production of sexually selected assessment signals have been identified across a diverse range of taxa, and in some cases these changes have been shown to affect receiver response to those signals. One important type of change occurs even after a signaler reaches breeding age, a phenomenon known as delayed maturation. Delayed maturation has been observed in the songs of several bird species, with potential fitness consequences for males as a byproduct of female choosiness or male competition. Here, we analyzed songs recorded across the first three years of life in a cohort of hand-reared song sparrows (Melospiza melodia) to detect early-life age-related changes in song. We focused on three measures of song complexity, including within song type variation, the average number of notes and the number of unique note types for the most common variant of each song type, and five measures of song production patterns, including singing rate, time interval between songs within a bout of the same song type, time interval between bouts (i.e., when the song type changes), within-song stereotypy, and between-song consistency. All measures of song complexity and most measures of song production patterns (excluding within-song stereotypy) changed significantly within individuals as birds aged from 1 to 2 years of age as well as from 1 to 3 years of age (excluding within-bout time interval), whereas no significant changes occurred from 2 to 3 years of age. Based on these features, a linear discriminant model could distinguish between the song of young (age 1) and older (age 2 and 3) adult males, providing support that song could serve as an indicator of age in this species. We discuss potential implications of these results for mate choice and male-male competition in song sparrows. ... [Read More]

Total Size
4 files (27.3 KB)
Data Citation
  • Kochvar, K., Peters, S., Zipple, M. & Nowicki, S. (2021). Data from: Maturational changes in song sparrow song. Duke Research Data Repository.
  • 10.7924/r47w6gq34
Publication Date
  • ark:/87924/r47w6gq34
Collection Dates
  • April 2015-June 2015
  • April 2014-June 2014
  • April 2016-June 2016
Related Materials
Funding Agency
  • National Science Foundation
Grant Number
  • IOS-1144991
  • Data from: Maturational changes in song sparrow song
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