Friis Jakob Isager, Sabino Joana, Santos Pedro, Dabelsteen Torben, Cardoso Gonçalo C
Am Nat. 2021 May;197(5):607-614. doi: 10.1086/713708. Epub 2021 Mar 11.
AbstractTheory predicts that allometric constraints on sound production should be stronger for the lower frequencies of vocalizations than for the higher frequencies, which could originate from an allometry for sound frequency bandwidth. Using song recordings of approximately 1,000 passerine species (from >75% passerine genera), we show a significantly steeper allometry for the lower song frequencies than for the higher song frequencies, resulting in a positive allometry of frequency bandwidth: larger species can use wider bandwidths than smaller species. The bandwidth allometry exists in songbirds (oscines) but not in nonoscine passerines, indicating that it emerges from a combination of constraints to sound frequency production or transmission and the evolved behavior of oscines: unlike the narrow bandwidths of most nonoscine songs, the learned songs of oscines often use wide bandwidths that can be limited by both lower and upper constraints to sound frequency. This bandwidth allometry has implications for several research topics in acoustic communication.
摘要
理论预测，发声的异速生长限制对较低频率的发声而言应比对较高频率的发声更强，这可能源于声音频率带宽的异速生长。通过对约1000种雀形目鸟类（来自超过75%的雀形目属）的鸣声记录，我们发现较低鸣声频率的异速生长比高鸣声频率的异速生长显著更陡，从而导致频率带宽的正异速生长：体型较大的物种比较小的物种能使用更宽的带宽。带宽异速生长存在于鸣禽（雀形亚目）中，但在非雀形亚目雀形目鸟类中不存在，这表明它源于声音频率产生或传播的限制以及雀形亚目鸟类进化行为的综合作用：与大多数非雀形亚目鸟类鸣声的窄带宽不同，雀形亚目鸟类学习的鸣声通常使用宽带宽，而这可能受到声音频率的下限和上限限制。这种带宽异速生长对声学通讯中的几个研究主题具有启示意义。
