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  11. Click Detection Rate Variability Of Central North Pacific Sperm Whales From Passive Acoustic Towed Arrays

Click detection rate variability of central North Pacific sperm whales from passive acoustic towed arrays

Yvonne M Barkley1, Karlina P B Merkens2, Megan Wood2

  • 1Cooperative Institute for Marine and Atmospheric Research, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, Honolulu, Hawaii 96822, USA.

The Journal of the Acoustical Society of America
|April 17, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Passive acoustic monitoring (PAM) helps track whales. This study provides the first sperm whale click rates in the central North Pacific, crucial for accurate density estimations using cue counting.

Area of Science:

  • Marine biology
  • Bioacoustics
  • Cetacean research

Background:

  • Passive acoustic monitoring (PAM) is effective for detecting marine mammals like cetaceans.
  • Cue counting, an alternative density estimation method, relies on knowing average cue production rates.
  • Sperm whale click rate data is scarce for the central North Pacific, hindering accurate density estimates.

Purpose of the Study:

  • To calculate sperm whale click rates in the central North Pacific using towed hydrophone array data.
  • To investigate factors influencing sperm whale click rates, including click type, location, distance, and group size.
  • To provide essential data for improving sperm whale density estimations through acoustic methods.

Main Methods:

  • Utilized towed hydrophone array data to record sperm whale vocalizations.

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  • Calculated click rates in the absence of acoustic tag data.
  • Analyzed variability in click rates based on click type, location, whale proximity, and visually estimated group size.

    • Main Results:

    • Determined the first sperm whale click rates for the central North Pacific region.
    • Identified click type as the most significant factor influencing click rates, with codas associated with higher rates.
    • Observed a positive correlation between sperm whale group size and click detection rates.

    Conclusions:

    • Sperm whale click rates vary significantly with click type and group size.
    • These findings are vital for refining acoustic density estimation techniques for deep-diving cetaceans.
    • Click rates provide valuable insights into sperm whale behavior and population monitoring.