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Can you hear me? Playback experiment highlights detection range differences between commonly used PAM devices: C-POD,
Nicole R E Todd1,2, Ailbhe S Kavanagh3, Mark J Jessopp1,2
1MaREI Centre, Environmental Research Institute, University College Cork, Cork, Ireland.
Plos One
|April 9, 2025
Summary
This study compared detection ranges of passive acoustic monitoring devices for harbour porpoises. SoundTrap and F-POD showed greater effective detection areas than C-POD, impacting abundance estimates.
Area of Science:
- Marine bioacoustics
- Cetacean research
- Ecological monitoring technology
Background:
- Passive acoustic monitoring (PAM) is crucial for tracking acoustically active small cetaceans like the harbour porpoise.
- Standardizing PAM device performance is essential for comparable study findings.
Purpose of the Study:
- To compare the detection probability and effective detection radius/area (EDR/EDA) of C-POD, F-POD, and SoundTrap devices.
- To assess how device performance differences impact harbour porpoise monitoring and abundance estimation.
Main Methods:
- Playback experiments using harbour porpoise recordings with co-deployed C-POD, F-POD, and SoundTrap devices.
- Analysis of detection probability and EDR/EDA across varying distances and environmental conditions.
Main Results:
- SoundTrap and F-POD exhibited maximum detection distances of 400-500m (EDR 297m and 241m, respectively).
- C-POD had a lower maximum detection distance of 300-400m (EDR 220m).
- Lower EDR for harbour porpoise buzzes than clicks suggests potential underestimation of foraging time.
Conclusions:
- Detection ranges vary significantly among common PAM devices, affecting cross-study comparability.
- Understanding device-specific EDR/EDA is vital for accurate PAM-derived density and abundance estimates.
- This knowledge is essential for planning effective long-term acoustic monitoring projects.
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