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Trackline and point detection probabilities for acoustic surveys of Cuvier's and Blainville's beaked whales
Barlow, J.; Tyack, P.L.; Johnson, M.P.; Baird, R.W.; Schorr, G.S.; Andrews, R.D.; Aguilar de Soto, N. (2013). Trackline and point detection probabilities for acoustic surveys of Cuvier's and Blainville's beaked whales. J. Acoust. Soc. Am. 134: 2486-2496. hdl.handle.net/10.1121/1.4816573
In: The Journal of the Acoustical Society of America. American Institute of Physics: New York, etc. ISSN 0001-4966, more
Peer reviewed article  

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Keyword
    Marine
Author keywords
    Microphones Acoustic sensing Agroacoustics Data analysis Acoustic pattern recognition Acoustics Oceans Geoinformatics Marine vehicle noise Marine vessels

Authors  Top 
  • Barlow, J.
  • Tyack, P.L.
  • Johnson, M.P.
  • Baird, R.W.
  • Schorr, G.S.
  • Andrews, R.D.
  • Aguilar de Soto, N.

Abstract
    Acoustic survey methods can be used to estimate density and abundance using sounds produced by cetaceans and detected using hydrophones if the probability of detection can be estimated. For passive acoustic surveys, probability of detection at zero horizontal distance from a sensor, commonly called g(0), depends on the temporal patterns of vocalizations. Methods to estimate g(0) are developed based on the assumption that a beaked whale will be detected if it is producing regular echolocation clicks directly under or above a hydrophone. Data from acoustic recording tags placed on two species of beaked whales (Cuvier's beaked whale—Ziphius cavirostris and Blainville's beaked whale—Mesoplodon densirostris) are used to directly estimate the percentage of time they produce echolocation clicks. A model of vocal behavior for these species as a function of their diving behavior is applied to other types of dive data (from time-depth recorders and time-depth-transmitting satellite tags) to indirectly determine g(0) in other locations for low ambient noise conditions. Estimates of g(0) for a single instant in time are 0.28 [standard deviation (s.d.) = 0.05] for Cuvier's beaked whale and 0.19 (s.d. = 0.01) for Blainville's beaked whale.

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