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

TitleTrackline and point detection probabilities for acoustic surveys of Cuvier's and Blainville's beaked whales
Publication TypeJournal Article
Year of Publication2013
AuthorsBarlow, Jay, Tyack Peter L., Johnson Mark P., Baird Robin W., Schorr Gregory S., Andrews Russel D., and de Soto Natacha Aguilar
JournalThe Journal of the Acoustical Society of America
Volume134
Pagination2486-2496
EndNote Rec Number10412
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 behaviour for these species as a function of their diving behaviour 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.