True's beaked whales (Mesoplodon mirus) were encountered on two separate shipboard surveys on 24 July 2016 and 16 September 2017 in the western North Atlantic Ocean. Recordings were made using a hydrophone array towed 300 m behind the ship. In 2016, three different groups were sighted within 1500 m of the ship; clicks were recorded for 26 min. In 2017, a single group of five whales was tracked over the course of five hours in which the ship maintained a distance <4000 m from the group. A total of 2938 frequency-modulated (FM) clicks and 7 buzzes were recorded from both encounters. Plausible inter-click-intervals (ICIs) were calculated from 2763 clicks, and frequency and duration measurements were calculated from 2150 good quality FM clicks. The median peak frequencies were 43.1 kHz (2016, n = 718) and 43.5 kHz (2017, n = 1432). Median ICIs were 0.17 s (2016) and 0.19 s (2017). The spectra and measurements of the recorded clicks closely resemble Gervais's beaked whale clicks (Mesoplodon europaeus) and distinguishing between the two species in acoustic data sets proves difficult. The acoustic behavior of True's beaked whales was previously unknown; this study provides a description of echolocation clicks produced by this species.
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November 2018
November 08 2018
A description of echolocation clicks recorded in the presence of True's beaked whale (Mesoplodon mirus)
Annamaria Izzi DeAngelis;
Annamaria Izzi DeAngelis
a)
Integrated Statistics, under contract to the Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration (NOAA)
, 166 Water Street, Woods Hole, Massachusetts 02543, USA
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Joy E. Stanistreet;
Joy E. Stanistreet
Fisheries and Oceans Canada, Bedford Institute of Oceanography
, 1 Challenger Drive, Dartmouth, Nova Scotia, B2Y 4A2, Canada
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Simone Baumann-Pickering;
Simone Baumann-Pickering
Scripps Institution of Oceanography, University of California San Diego
, 9500 Gilman Drive, La Jolla, California 92093-0205, USA
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Danielle M. Cholewiak
Danielle M. Cholewiak
Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration (NOAA)
, 166 Water Street, Woods Hole, Massachusetts 02543, USA
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a)
Electronic mail: [email protected]
J. Acoust. Soc. Am. 144, 2691–2700 (2018)
Article history
Received:
March 09 2018
Accepted:
October 15 2018
Citation
Annamaria Izzi DeAngelis, Joy E. Stanistreet, Simone Baumann-Pickering, Danielle M. Cholewiak; A description of echolocation clicks recorded in the presence of True's beaked whale (Mesoplodon mirus). J. Acoust. Soc. Am. 1 November 2018; 144 (5): 2691–2700. https://doi.org/10.1121/1.5067379
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