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Trackline and point detection probabilities for acoustic surveys of Cuvier’s and Blainville’s beaked whales

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Jay Barlow, Peter Lloyd Tyack, Mark J Johnson, Robin W Baird, Greg S Schorr, Russ D Andrews, Natacha Aguilar de Soto

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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.) ¼ 0.05] for Cuvier’s beaked whale and 0.19 (s.d. ¼ 0.01) for Blainville’s beaked whale.
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Original languageEnglish
Pages (from-to)2486-2496
JournalJournal of the Acoustical Society of America
Volume134
Issue number3
DOIs
StatePublished - Feb 2013

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