Acoustic-based estimates of Cuvier's beaked whale (Ziphius cavirostris) density and abundance along the U.S. West Coast from drifting hydrophone recorders

Barlow, Jay; Moore, Jeffrey E.; McCullough, Jennifer L. K.; Griffiths, Emily T.

doi:10.1111/mms.12872

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Acoustic-based estimates of Cuvier's beaked whale (Ziphius cavirostris) density and abundance along the U.S. West Coast from drifting hydrophone recorders

2021
By Barlow, Jay ; Moore, Jeffrey E. ; McCullough, Jennifer L. K. ; ...
Source: Mar Mam Sci. 2022;38:517–538.

[PDF-931.73 KB]

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Journal Title:

Marine Mammal Science
Personal Author:

Barlow, Jay ; Moore, Jeffrey E. ; McCullough, Jennifer L. K. ; Griffiths, Emily T.

Barlow, Jay ; Moore, Jeffrey E. ; McCullough, Jennifer L. K. ; Griffiths, Emily T. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) ; PIFSC (Pacific Islands Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) ; PIFSC (Pacific Islands Fisheries Science Center) Less -
Description:

An acoustic survey of Cuvier's beaked whales (Ziphius cavirostris) was conducted off the U.S. West Coast in August and September 2016 using drifting recorder systems with a vertical array of two hydrophones at a depth of ~110 m. Recorders were deployed 22 times to representatively cover a 1,058,000 km2 study area from the shelf break to ~556 km offshore. Vertical angles to echolocation pulses were measured using the signal time-difference-of-arrival on the two hydrophones. Echolocation pulses of Cuvier's beaked whales were identified from their arrival angles (always from below the array) and unique acoustic characteristics. The density and abundance of Cuvier's beaked whales were estimated using a group-based point-transect analysis with 2 min time snapshots. The area effectively surveyed was estimated using a maximum simulated likelihood approach to fit the observed distribution of signal arrival angles. The acoustic availability of whales during their dive cycle was estimated from the duration of acoustic encounters using a mark-recapture approach. Overall, Cuvier's beaked whales were present during 0.60% of snapshots, and their estimated average density is 5.12 animals per 1,000 km2 (CV = 0.27). Their estimated abundance in the study area is 5,454 individuals (95% credibility intervals: 3,151 to 8,907).
Keywords:

[+]

Echolocation (Physiology) Hydrophone Whales Ziphius Cavirostris Abundance Estimation Acoustic Survey Cuvier's Beaked Whale Drifting Buoy Recorder Point-transect Vertical Hydrophone Array
Source:

Mar Mam Sci. 2022;38:517–538.
DOI:

https://doi.org/10.1111/mms.12872
Document Type:

Journal Article
Place as Subject:

Pacific Coast (America)
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

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urn:sha256:a9619ec028982b04798bd9ea531e0c6b3912fc428c8c032c8520661bb85fc0ac
Download URL:

https://repository.library.noaa.gov/view/noaa/41020/noaa_41020_DS1.pdf
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Acoustic-based estimates of Cuvier's beaked whale (Ziphius cavirostris) density and abundance along the U.S. West Coast from drifting hydrophone recorders

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