A mechanism for antiphonal echolocation by free-tailed bats
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- 作者：Jenna Jarvis ; Kirsten M. Bohn ; Jedediah Tressler ; Michael Smotherman
- 关键词：acoustic masking ; animal communication ; bat ; echolocation ; free-tailed bat ; noise ; Tadarida brasiliensis ; vocalization
- 刊名：Animal Behaviour
- 出版年：2010
- 出版时间：April 2010
- 年：2010
- 卷：79
- 期：4
- 页码：787-796
- 全文大小：542 K
文摘
Bats are highly social and spend much of their lives echolocating in the presence of other bats. To reduce the effects of acoustic interferences from other bats' echolocation calls, we hypothesized that bats might shift the timing of their pulse emissions to minimize temporal overlap with another bat's echolocation pulses. To test this hypothesis, we investigated whether free-tailed bats, Tadarida brasiliensis, echolocating in the laboratory would shift the timing of their own pulse emissions in response to regularly repeating artificial acoustic stimuli. Each bat tested showed a robust phase-locked temporal pattern in pulse emissions that included an initial suppressive phase lasting more than 60 ms after stimulus onset, during which the probability of emitting pulses was reduced by more than 50 % , followed by a compensatory rebound phase, the timing and amplitude of which were dependent on the temporal pattern of the stimulus. The responses were nonadapting and were largely insensitive to broad changes in the acoustic properties of the stimulus. Randomly occurring noise bursts also suppressed calling for up to 60 ms, but the time course of the compensatory rebound phase was more rapid than when the bats were responding to regularly repeating patterns of noise bursts. These findings provide the first quantitative description of how external stimuli may cause echolocating bats to alter the timing of subsequent pulse emissions.