[MARMAM] Publication: Sowerby's beaked whales

Danielle Cholewiak danielle.cholewiak at noaa.gov
Wed Nov 6 06:48:42 PST 2013

Dear list members,

My colleagues and I are happy to announce our recent publication:

Cholewiak, D., Baumann-Pickering, S., and S. Van Parijs. 2013. Description
of sounds associated with Sowerby's beaked whales (Mesoplodon bidens) in
the western North Atlantic Ocean. J. Acoust. Soc. Am. 134, 3905-3912.

Several groups of Sowerby's beaked whales (Mesoplodon bidens) were
encountered on July 4, 2011, during a shipboard cetacean survey conducted
off the eastern seaboard of the United States. Acoustic recordings were
collected using a three-element towed hydrophone array. Many echolocation
clicks were recorded during the encounter, but no tonal sounds were
detected. A total of 2969 echolocation clicks were included in analyses of
frequency and temporal characteristics. A Gaussian mixture model with four
mixtures was fitted to the histogram of peak frequencies; four subsets of
clicks were designated. The majority of clicks (n = 2048) contained a
median peak frequency of 33 kHz, while the others contained a median peak
frequency of 25 kHz (n = 324), 51 kHz (n = 304), or 67 kHz (n = 293). Most
clicks did not contain a clear frequency-modulated upsweep, though some
clicks exhibited a slight sweep from 30–36 kHz. Seven burst pulses were
detected in the encounter, two of which were of high enough quality for
detailed analysis. The acoustic characteristics of Sowerby's beaked whales
have not previously been described; the current study will facilitate
incorporation of these data into passive acoustic monitoring programs in
the North Atlantic Ocean.

A PDF may be obtained from JASA:  http://link.aip.org/link/?JAS/134/3905/

Or requests for reprints can be sent to: danielle.cholewiak at noaa.gov


Danielle Cholewiak, Ph.D.
Protected Species Branch
NOAA Northeast Fisheries Science Center
166 Water Street
Woods Hole, MA 02543
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