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September 27, 2025Frontiers in Marine ScienceOpen Access

Artificial clicks (Porpoise ALert) affect acoustic monitoring of harbour porpoises and their echolocation behaviour

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Authors

JSJoseph SchnitzlerAfrican Wildlife FoundationLMLouise Sylvie Angele MoysanUniversity of Veterinary Medicine Hannover, FoundationJEJuan Felipe Escobar-CalderonAfrican Wildlife Foundation

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Overview

Observational analysis reveals artificial clicks influence harbour porpoise echolocation, suggesting monitoring may be compromised.

Key Points

  • The trained algorithm accurately discriminates between artificial PAL signals and natural porpoise clicks, with 99.74% sensitivity.
  • Recording of artificial clicks from Porpoise ALert changes the natural behaviour of harbour porpoises, indicating altered echolocation patterns.
  • Analysis utilized an array of C-PODs to assess the monitoring impact of artificial sounds on porpoise populations, crucial for conservation efforts.
  • The study underscores the need for reliable acoustic monitoring data, which is essential for effective management measures of declining harbour porpoise populations.

Cite This Study

Schnitzler et al. (2025) studied this question.

synapsesocial.com/papers/68d7be62eebfec0fc5237974https://doi.org/10.3389/fmars.2025.1591839
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Harbor porpoises and the machine: Assisting manual validation of click trains recorded by Cetacean Porpoise Detector2026
  2. 2Acoustic monitoring of harbor porpoises in Hood Canal, WA: Efforts to improve detection of a highly cryptic cetacean2024
  3. 3Pingers as a potential deterrent tool to mitigate Burmeister’s porpoise (Phocoena spinipinnis) bycatch while foraging nocturnally in the Humboldt Current System: a pilot study2025
  4. 4A hybrid method combining rule-based filter and machine learning to detect porpoise and vessel sounds from a pulse event recorder2025
  5. 5Follow-up study after four years shows reduced deterrence effect of pingers on harbour porpoises in Norwegian gillnet fishery2025