|
Titre :
|
Consistency of two-voice vocalizations as a possible performance metric in a widespread songbird (2025)
|
|
Auteurs :
|
Sarah D. Gu, Auteur ;
Neil E. Sathi, Auteur ;
Caroline Dingle, Auteur ;
Karan J. Odom, Auteur
|
|
Type de document :
|
Article
|
|
Dans :
|
Wilson Journal of Ornithology (The) (137(2) June, 2025)
|
|
Article en page(s) :
|
144-154
|
|
Mots-clés:
|
Bird
;
Copsychus saularis
;
Oriental Magpie-Robin
;
ave
;
limitaciones de desempeño
;
performance constraint
;
producción del canto
;
song production
|
|
Résumé :
|
Birdsong is subject to performance constraints due to structural limitations of the syrinx and other anatomy involved in song production. Therefore, certain vocalizations may be difficult to produce and perform consistently (like a challenging performance or athletic feat). In this case, the ability to consistently produce a difficult birdsong could be a quality indicator or performance metric. An individual bird’s ability to consistently produce two-voice vocalizations characterized on the spectrogram by the appearance of two distinct frequencies overlapping in time, could be one such performance metric. To test this, we measured and compared the structure and consistency in frequency and time metrics between notes with and without two-voice (overlapping) note structure in songs of Oriental Magpie-Robins (Copsychus saularis), a widespread Southeast Asian species. We found that all frequency and time values measured were significantly different for two-voice and non-two-voice notes, indicating structural differences between two-voice and non-two-voice notes. In a comparison of the coefficients of variation of frequency and time metrics, only the coefficient of variation for 90% bandwidth was significantly different between two-voice and non-two-voice notes. Bandwidth was significantly more variable for two-voice notes than for non-two-voice notes, indicating that bandwidth was more inconsistently performed for two-voice notes than for non-two-voice notes. Thus, producing notes with consistent bandwidth while producing overlapping frequencies could be challenging and therefore a performance constraint. Our results suggest that this could be an interesting avenue for future research.
|
|
En ligne :
|
https://doi.org/10.1080/15594491.2024.2444034
|
