Study
Birds and mammals sing at a higher pitch in noisy areas: adaptation to habitat acoustics or side effect of amplitude?
Nemeth, Erwin; Brumm, Henrik
The American Naturalist, 2010
Modelled how much of the masking problem a small upward frequency shift would actually solve, and examined whether the reported shifts could instead be a by-product of singing louder, since in many vocal systems producing a louder sound also raises its frequency.
- Studied in
- Aves, Mammalia
- Sample size
- reanalysis and modelling of published frequency shifts against transmission gain
The measured frequency shifts are far too small to give a meaningful improvement in signal transmission through traffic noise, while singing louder — which does improve it substantially — produces a frequency rise as a mechanical consequence.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Higher-pitched urban song is better explained as a side effect of increased amplitude than as an adaptation to escape masking.
How NatureHQ reads it
The paper that should be read next to every "city birds sing higher" headline. It does not dispute that the shift is real; it disputes the explanation, and it does so with an argument that is hard to wave away — the shift is too small to help. The alternative is unglamorous and probably right: the birds are shouting, and shouting is higher. Anyone in a noisy bar does the same thing, and calling it an adaptation to bar acoustics would be an overreach.
- Modelling and reanalysis rather than new field measurement.
- The amplitude explanation does not preclude adaptive adjustment as well; the two are not mutually exclusive and both may operate.
- Amplitude is much harder to measure in the field than frequency, so the direct data on it remain thinner than the argument needs.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Birdsong in cities
City birds really do sing at a higher pitch, and the best explanation is not that they are dodging traffic noise — it is that they are singing louder, and louder is higher.
Birdsong in cities
When the traffic stopped in 2020, city birds changed their songs within weeks — so the urban pattern is birds adjusting, not different birds living in cities.
Published by: University press journalsPublished in a university press journal.
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