Ramsier Marissa A, Dominy Nathaniel J
Department of Anthropology; Humboldt State University; Arcata, CA USA.
Commun Integr Biol. 2012 Nov 1;5(6):637-40. doi: 10.4161/cib.21509.
The aye-aye is a rare lemur from Madagascar that uses its highly specialized middle digit for percussive foraging. This acoustic behavior, also termed tap-scanning, produces dominant frequencies between 6 and 15 kHz. An enhanced auditory sensitivity to these frequencies raises the possibility that the acoustic and auditory specializations of aye-ayes have imposed constraints on the evolution of their vocal signals, especially their primary long-distance vocalization, the screech. Here we explore this concept, termed receiver bias, and suggest that the dominant frequency of the screech call (~2.7 kHz) represents an evolutionary compromise between the opposing adaptive advantages of long-distance sound propagation and enhanced detection by conspecific receivers.
指猴是一种来自马达加斯加的珍稀狐猴，它利用高度特化的中指进行敲击式觅食。这种声学行为，也称为敲击扫描，产生的主频在6至15千赫之间。对这些频率的听觉敏感性增强，增加了一种可能性，即指猴的声学和听觉特化对其声音信号的进化产生了限制，尤其是其主要的长距离发声——尖叫声。在这里，我们探讨这个被称为接收者偏差的概念，并认为尖叫声的主频（约2.7千赫）代表了长距离声音传播的适应性优势与同种接收者增强检测能力这两种相反适应性优势之间的进化折衷。
