Trackline and point detection probabilities for acoustic surveys of Cuvier’s and Blainville’s beaked whales
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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.
Barlow , J , Tyack , P L , Johnson , M J , Baird , R W , Schorr , G S , Andrews , R D & de Soto , N A 2013 , ' Trackline and point detection probabilities for acoustic surveys of Cuvier’s and Blainville’s beaked whales ' Journal of the Acoustical Society of America , vol. 134 , no. 3 , pp. 2486-2496 . DOI: 10.1121/1.4816573
Journal of the Acoustical Society of America
Copyright 2013 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared as Trackline and point detection probabilities for acoustic surveys of Cuvier’s and Blainville’s beaked whales Barlow, J., Tyack, P. L., Johnson, M. J., Baird, R. W., Schorr, G. S., Andrews, R. D. & de Soto, N. A. Feb 2013 In : Journal of the Acoustical Society of America. 134, p. 2486-2496 and may be found at http://scitation.aip.org/content/asa/journal/jasa/134/3/10.1121/1.4816573
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