Study
Continent-wide shifts in song dialects of white-throated sparrows
Otter, Ken A.; Mckenna, Alexandra; LaZerte, Stefanie E.; Ramsay, Scott M.
Current Biology, 2020
Recordings of white-throated sparrow song made across Canada over roughly two decades — including a large archive of citizen-science recordings — were analysed for the ending of the song, which traditionally consisted of a repeated three-note triplet.
- Studied in
- Zonotrichia albicollis
- Sample size
- recordings spanning two decades across Canada, including archived and citizen-science recordings
A variant ending in a two-note doublet, first noted in a small western population, spread east across the continent over about twenty years and replaced the historical triplet ending across most of the range surveyed.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
A song variant has undergone a rapid continent-wide cultural sweep, plausibly aided by young males encountering the variant on shared wintering grounds.
How NatureHQ reads it
The best-documented cultural sweep in any bird, and the reason it exists is worth noticing: the analysis leans heavily on recordings made by amateur birders and deposited in public archives, which is the only way anyone had twenty years of continental coverage. As evidence it is unusually strong on the *what* — the replacement is not subtle — and necessarily weaker on the *why*, since no experiment was or could be run on a continent. It is the closest avian equivalent to the humpback song sweeps across the Pacific.
- Observational. The proposed mechanism, mixing on shared wintering grounds, is inference rather than demonstration.
- Recording effort is uneven in space and time, and citizen-science archives are biased towards accessible and populated areas.
- Why the doublet variant spread rather than persisting locally is unknown; nothing here shows it is preferred by females or more effective against rivals.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Birdsong dialects
A new song ending appeared in western Canada and replaced the old one across the continent in about twenty years — a cultural change tracked as it happened.
Birdsong dialects
Song culture can also do the opposite of changing. Where young birds preferentially copy the commonest version they hear, a song type can persist essentially unchanged for centuries.
Published by: Cell PressPublished in a Cell Press journal.
doi.org/10.1016/j.cub.2020.05.084
Checked against Crossref and OpenAlex on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-02.