Comparing acoustic and radar deterrence methods as mitigation measures to reduce human-bat impacts and conservation...

Area of Science:

• Wildlife Conservation
• Applied Ecology
• Bioacoustics

Background:

• Human-wildlife coexistence necessitates conflict mitigation strategies.
• Deterrence methods can reduce human impacts on wildlife and resolve conservation conflicts.
• Acoustic and radar technologies show potential for deterring bats.

Purpose of the Study:

• To evaluate the efficacy of acoustic (ultrasonic speakers) and radar methods for deterring bats.
• To assess the impact of these methods on bat activity at foraging sites.

Main Methods:

• Field experiment testing ultrasonic speakers and radar as bat deterrents.
• Monitoring bat activity using infrared video and acoustic recording devices.
• Statistical analysis using generalized linear mixed effect models.

Main Results:

• Ultrasonic speakers significantly reduced overall bat activity by ~80%.
• Radar technology alone had no significant effect on bat activity.
• Specific bat species (Pipistrellus pipistrellus and P. pygmaeus) showed reduced activity with ultrasound, while Myotis species did not.

Conclusions:

• Acoustic deterrence using ultrasonic speakers is a viable method for reducing bat activity at foraging sites.
• Radar technology is not effective for deterring bats in this context.
• Further research and case-by-case assessments are recommended for implementing acoustic bat deterrents, prioritizing bat conservation.