Abstract: The echolocation behaviors of two species of Myotis bats were compared when they flied. Results revealed that: the sonagrams of the two bats were both FM form, hut they hail obvious difference in the structure of sonagram anti frequency range. The call duration of Myotis myotis luctuosus was shorter in the two species of bats (1.6±0.3 ms), its duty-cycle was lower (4.0%), and its DF (Dominant frequency) was lower too (44.6±4.3 kHz). On the other hand, Myotis daubentoni’s call duration was, longer (4.2±1.6 ms, its duty-cycle (9.6%) and DF (83.0±4.0 kHz) were higher as well. The adaptations of echolocation to habitat and foraging strategy were also analyzed with a view to morphology and preys of these two species of Myotis.

Key words: Myotis, Echolocation, Foraging strategy, Comparative study

摘要： 对鼠耳蝠属两种蝙蝠飞行状态下的声发射进行了比较研究。结果表明：两种鼠耳蝠声发射信号的声谱图都呈调频（FM）型，但在波形及频率范围上有明显差异。大鼠耳蝠（四川亚种）的声脉冲宽度很小（1.6±0.3 ms），能率环较低(4.0%），其主频率（DF=44.6±4.3kHz)也较低；而水鼠耳蝠的声脉冲宽度较大（4.2±1.6ms），能率环（9.6%）及主频率（DF=83.0±4.0kHz)也较高。文中结合两种蝙蝠的形态及食性分析了回声定位对捕食生境及捕食策略的适应性。