[Top] [All Lists]

fwd: Beaked whale biosonar paper

Subject: fwd: Beaked whale biosonar paper
From: Dave Mellinger <>
Date: Tue, 21 Sep 2004 11:22:38 -0700
Subject: Beaked whale biosonar paper
Date: Sat, 18 Sep 2004 14:27:02 -0400
 Please be informed that a paper entitled "Beaked whales echolocate on prey"
 by Johnson et al. has recently been published in Proceedings of the Royal
 Society Letters. See abstract below.
 Requests for reprints can be directed to:
 Mark Johnson     [EMAIL PROTECTED]
 Peter Tyack      [EMAIL PROTECTED]
 Please do not reply directly to this message.
 Best regards,
 Peter T. Madsen
 Woods Hole Oceanographic Institution
 Beaked whales echolocate on prey
 Mark Johnson 1*, Peter T. Madsen 1, Walter M. X. Zimmer 2, 
 Natacha Aguilar de Soto 3 and Peter L. Tyack 1
 1 Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
 2 NATO Undersea Research Center, viale San Bartolomeo 400, 19138 La Spezia, 
 3 La Laguna University, Tenerife, Canary Islands, Spain
 * Author for correspondence ([EMAIL PROTECTED]).
 Beaked whales (Cetacea: Ziphiidea) of the genera
 Ziphius and Mesoplodon are so difficult to study
 that they are mostly known from strandings. How
 these elusive toothed whales use and react to sound
 is of concern because they mass strand during naval
 sonar exercises. A new non-invasive acoustic recording
 tag was attached to four beaked whales (two
 Mesoplodon densirostris and two Ziphius
 cavirostris) and recorded high-frequency clicks during
 deep dives. The tagged whales only clicked at
 depths below 200 m, down to a maximum depth of
 1267 m. Both species produced a large number of
 short, directional, ultrasonic clicks with no
 significant energy below 20 kHz. The tags recorded
 echoes from prey items; to our knowledge, a first for
 any animal echolocating in the wild. As far as we are
 aware, these echoes provide the first direct evidence
 on how free-ranging toothed whales use echolocation
 in foraging. The strength of these echoes
 suggests that the source level of Mesoplodon clicks
 is in the range of 200?220 dB re 1 _Pa at 1 m. This
 paper presents conclusive data on the normal vocalizations
 of these beaked whale species, which may
 enable acoustic monitoring to mitigate exposure to
 sounds intense enough to harm them.

<Prev in Thread] Current Thread [Next in Thread>
  • fwd: Beaked whale biosonar paper, Dave Mellinger <=

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the Bioacoustics-L mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU