Department of Psychological and Brain Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
J Acoust Soc Am. 2018 Aug;144(2):806. doi: 10.1121/1.5050525.
In this study, the echolocation and flight behaviors of the Taiwanese leaf-nosed bat (), which uses constant-frequency (CF) biosonar signals combined with a frequency-modulated (FM) sweep, are compared with those of the big brown bat (), which uses FM signals alone. The CF-FM bat flew through a corridor bounded by vertical poles on either side, and the inter-pole spacing of the walls was manipulated to create different echo flow conditions. The bat's flight trajectories and echolocation behaviors across corridor conditions were analyzed. Like the big brown bat, the Taiwanese leaf-nosed bat centered its flight trajectory within the corridor when the pole spacing was the same on the two walls. However, the two species showed different flight behaviors when the pole spacing differed on the two walls. While the big brown bat deviated from the corridor center towards the wall with sparse pole spacing, the Taiwanese leaf-nosed bat did not. Further, in comparison to , utilized different echolocation patterns showing a prevalence of grouping sounds into clusters of three. These findings indicate that the two species' distinct sonar signal designs contribute to their differences in flight trajectories in a structured corridor.
在这项研究中，我们比较了使用恒频（CF）生物声纳信号结合调频（FM）扫频的台湾狐蝠（）和仅使用 FM 信号的大棕蝠（）的回声定位和飞行行为。CF-FM 蝙蝠在由两侧垂直杆围成的通道中飞行，并且操纵墙壁之间的极间距以产生不同的回声流条件。分析了蝙蝠在不同走廊条件下的飞行轨迹和回声定位行为。与大棕蝠一样，当两壁上的极间距相同时，台湾狐蝠将其飞行轨迹集中在通道内。然而，当两壁上的极间距不同时，这两个物种表现出不同的飞行行为。当大棕蝠向稀疏极距的墙壁偏离通道中心时，台湾狐蝠则没有。此外，与大棕蝠相比，台湾狐蝠利用不同的回声定位模式，将声音分组为三个一组。这些发现表明，这两个物种不同的声纳信号设计导致它们在结构通道中的飞行轨迹存在差异。
