Diving behavior of Cuvier's beaked whales inferred from three-dimensional acoustic localization and tracking using a nested array of drifting hydrophone recorders
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Echolocation pulses from Cuvier's beaked whales are used to track the whales' three-dimensional diving behavior in the Catalina Basin, California. In 2016, five 2-element vertical hydrophone arrays were suspended from the surface and drifted at ∼100-m depth. Cuvier's beaked whale pulses were identified, and vertical detection angles were estimated from time-differences-of-arrival of either direct-path signals received on two hydrophones or direct-path and surface-reflected signals received on the same hydrophone. A Bayesian state-space model is developed to track the diving behavior. The model is fit to these detection angle estimates from at least four of the drifting vertical arrays. Results show that the beaked whales were producing echolocation pulses and are presumed to be foraging at a mean depth of 967 m (standard deviation = 112 m), approximately 300 m above the bottom in this basin. Some whales spent at least some time at or near the bottom. Average swim speed was 1.2 m s-1, but swim direction varied during a dive. The average net horizontal speed was 0.6 m s-1. Results are similar to those obtained from previous tagging studies of this species. These methods may allow expansion of dive studies to other whale species that are difficult to tag.
Barlow , J , Griffiths , E T , Klinck , H & Harris , D V 2018 , ' Diving behavior of Cuvier's beaked whales inferred from three-dimensional acoustic localization and tracking using a nested array of drifting hydrophone recorders ' Journal of the Acoustical Society of America , vol. 144 , no. 4 , pp. 2030-2041 . https://doi.org/10.1121/1.5055216
Journal of the Acoustical Society of America
© 2018, Acoustical Society of America. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1121/1.5055216
DescriptionFunding for this research was provided by the U.S. Office of Naval Research (Project Nos. N00014-15-1-2142 and MIPR N0001416IP00059) and NOAA's Southwest Fisheries Science Center. Vessel time on the Horizon was funded by NOAA's Cooperative Research Program. Funding for DASBR development and some equipment was provided by the U.S. Navy's N45 and Living Marine Resource programs and by NOAA's Acoustics Program.
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