Echolocation signals from Baird's beaked whales were recorded during visual and acoustic shipboard surveys of cetaceans in the California Current ecosystem and with autonomous, long-term recorders in the Southern California Bight. The preliminary measurement of the visually validated Baird's beaked whale echolocation signals from towed array data were used as a basis for identifying Baird's signals in the autonomous recorder data. Two distinct signal types were found, one being a beaked whale-like frequency modulated (FM) pulse, the other being a dolphin-like broadband click. The median FM inter-pulse interval was 230 ms. Both signal types showed a consistent multi-peak structure in their spectra with peaks at ∼9, 16, 25, and 40 kHz. Depending on signal type, as well as recording aspect and distance to the hydrophone, these peaks varied in relative amplitude. The description of Baird's echolocation signals will allow for studies of their distribution and abundance using towed array data without associated visual sightings and from autonomous seafloor hydrophones.
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June 2013
June 05 2013
Baird's beaked whale echolocation signals
Simone Baumann-Pickering;
Simone Baumann-Pickering
a)
Scripps Institution of Oceanography, University of California San Diego
, 9500 Gilman Drive #0205, La Jolla, California 92093
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Tina M. Yack;
Tina M. Yack
b)
BioWaves Inc.
, 144 West D Street, Suite 205, Encinitas, California 92024
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Jay Barlow;
Jay Barlow
Marine Mammal and Turtle Division
, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 8901 La Jolla Shores Drive, La Jolla, California 92037
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Sean M. Wiggins;
Sean M. Wiggins
Scripps Institution of Oceanography, University of California San Diego
, 9500 Gilman Drive #0205, La Jolla, California 92093
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John A. Hildebrand
John A. Hildebrand
Scripps Institution of Oceanography, University of California San Diego
, 9500 Gilman Drive #0205, La Jolla, California 92093
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a)
Author to whom correspondence should be addressed. Electronic mail: sbaumann@ucsd.edu
b)
Also at: Southwest Fisheries Science Center, 8901 La Jolla Shores Drive, La Jolla, CA 92037, and Joint Doctoral Program in Ecology, San Diego State University and UC Davis, 5500 Companile Dr., San Diego, CA 92182.
J. Acoust. Soc. Am. 133, 4321–4331 (2013)
Article history
Received:
November 27 2012
Accepted:
April 23 2013
Citation
Simone Baumann-Pickering, Tina M. Yack, Jay Barlow, Sean M. Wiggins, John A. Hildebrand; Baird's beaked whale echolocation signals. J. Acoust. Soc. Am. 1 June 2013; 133 (6): 4321–4331. https://doi.org/10.1121/1.4804316
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