[MARMAM] New publication: A description of echolocation clicks recorded in the presence of True's beaked whale (Mesoplodon mirus)

Annamaria Izzi namarizzi at gmail.com
Tue Nov 13 12:38:43 PST 2018


On behalf of my co-authors, I am pleased to announce the publication of our
article in *The Journal of the Acoustical Society of America*:

A description of echolocation clicks recorded in the presence of True's
beaked whale (*Mesoplodon mirus*)

Annamaria Izzi DeAngelis, Joy E. Stanistreet, Simone Baumann-Pickering, and
Danielle M. Cholewiak


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’ 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.

For the full article, please visit https://doi.org/10.1121/1.5067379

To request a PDF copy, please email annamaria.deangelis at noaa.gov.



Annamaria DeAngelis
*Research Analyst*
Passive Acoustics Research Group | Northeast Fisheries Science Center
166 Water Street, Woods Hole, MA 02543
annamaria.deangelis at noaa.gov
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