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Foraging bats avoid noise.

Andrea Schaub¹, Joachim Ostwald, Björn M Siemers

¹Zoological Institute, Department of Animal Physiology, University of Tübingen, Auf der Morgenstelle 28, 72076 Tübingen, Germany.

The Journal of Experimental Biology

|September 23, 2008

Summary

This summary is machine-generated.

Anthropogenic noise, particularly broadband sounds, significantly impacts foraging behavior in greater mouse-eared bats (Myotis myotis). These bats, relying on passive listening, avoid noisy areas, reducing foraging success and suitability of habitats near noise sources.

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Area of Science:

Ecology
Bioacoustics
Animal Behavior

Background:

Ambient noise affects acoustic information use in animals.
Research often focuses on noise impacts on communication, not foraging.
Gleaning bats, like the greater mouse-eared bat (Myotis myotis), are vulnerable as they use passive listening for prey detection.

Purpose of the Study:

Investigate the influence of anthropogenic noise on bat foraging effort and success.
Test if bats avoid noisy foraging areas.
Determine if noise structure affects bat deterrence.

Main Methods:

A choice experiment with two foraging compartments was used.
The greater mouse-eared bat (Myotis myotis) was the model species.
Playback of silence, traffic noise, vegetation movement noise, and computer-generated noise was employed.

Main Results:

Bats showed equal foraging effort and success in silence.
Bats avoided the compartment with any non-silent noise playback.
Deterrence increased with noise intensity and similarity to prey sounds (vegetation noise).

Conclusions:

Anthropogenic noise degrades foraging areas for passive listening bats.
Habitat suitability is reduced near highways and other broadband noise sources.
Noise characteristics, not just amplitude, influence avoidance behavior.