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Robust Doppler Shift Compensation in Freely Flying Bats Under Acoustic Interference
Aoqiang Li1, Huijun Zhang1, Manman Lu1
1Key Laboratory of Pesticide & Chemical Biology of the Ministry of Education, Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China.
Integrative Zoology
|March 26, 2026
Summary
Pratt's roundleaf bats show remarkable Doppler shift compensation (DSC) immune to moderate noise. Surprisingly, their echolocation precision improved with specific narrowband noise and heterospecific bat calls.
Area of Science:
- Bioacoustics
- Animal Behavior
- Sensory Ecology
Background:
- Noise is a pervasive challenge in biological systems, impacting acoustic communication.
- Animals employ various strategies to mitigate noise, but performance rarely returns to noise-free levels.
- Doppler shift compensation (DSC) is a precise echolocation behavior crucial for many species.
Purpose of the Study:
- To investigate the impact of acoustic interference on the Doppler shift compensation (DSC) of Pratt's roundleaf bats (Hipposideros pratti).
- To determine if noise universally impairs motor performance in echolocating bats or if specific conditions can enhance performance.
Main Methods:
- Quantified DSC performance in flying H. pratti under 10 types of bandpass-filtered noise and seven bat species' echolocation calls.
- Included a silence control condition for comparison.
- Analyzed DSC precision across various acoustic interference scenarios.
Main Results:
- H. pratti maintained high DSC performance across all tested noise and playback conditions.
- DSC precision unexpectedly increased under specific narrowband noise and heterospecific bat calls.
- The acoustic stimuli that enhanced DSC coincided with the terminal frequency of H. pratti's echolocation calls.
Conclusions:
- Contrary to expectations, acoustic interference does not universally degrade motor performance in echolocating bats.
- H. pratti demonstrates exceptional resilience and even enhanced performance in DSC under certain noise conditions.
- This suggests that some species may evolve specialized adaptations to benefit from specific acoustic environments.
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