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How anthropogenic noise affects foraging.

Jinhong Luo1,2, Björn M Siemers1, Klemen Koselj1

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Summary
This summary is machine-generated.

Anthropogenic noise, including traffic noise, significantly impairs wildlife foraging efficiency. This study reveals noise acts as an aversive stimulus, impacting survival and reproduction across species.

Keywords:
Myotis daubentoniiallostatic loadanthrophonyglobal changehighway noisenoise pollutionroad impactsoundscape ecology

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Area of Science:

  • Ecology
  • Bioacoustics
  • Conservation Biology

Background:

  • Human activities increasingly impact the biosphere, with anthropogenic noise posing a significant, yet poorly understood, threat to wildlife.
  • While direct habitat destruction is well-documented, indirect effects like noise pollution on foraging behavior require further investigation.
  • Noise can disrupt foraging through multiple mechanisms, often simultaneously, making it difficult to isolate specific impacts.

Purpose of the Study:

  • To develop and apply a diagnostic framework to identify mechanisms by which anthropogenic noise impairs animal foraging.
  • To assess the impact of traffic noise on the foraging efficiency of Daubenton's bats, a species reliant on echolocation.
  • To understand the specific ways noise affects foraging success, with implications for animal survival and reproductive fitness.

Main Methods:

  • Developed a diagnostic framework to identify noise disturbance mechanisms in species sensitive to sound.
  • Utilized playback experiments with traffic noise and echolocation prey detection in Daubenton's bats.
  • Analyzed foraging efficiency by comparing successful prey capture rates under varying noise conditions (frequency overlap vs. no overlap).

Main Results:

  • Traffic noise significantly reduced foraging efficiency in most tested Daubenton's bats.
  • The reduction in foraging efficiency occurred regardless of whether the playback noise overlapped in frequency with prey echoes.
  • Noise did not increase search effort, indicating it did not primarily mask prey or reduce bat attention, but rather acted as an aversive stimulus causing avoidance.

Conclusions:

  • Anthropogenic noise, particularly traffic noise, impairs bat foraging efficiency by acting as an aversive stimulus leading to avoidance behavior.
  • Conservation policies may underestimate the widespread impact of noise pollution on wildlife if the specific mechanisms of disturbance are not considered.
  • Understanding these mechanisms is crucial for effective wildlife conservation strategies in human-dominated landscapes.