[MARMAM] Recording of toothed whale clicks

Peter T. Madsen peter.madsen at biology.au.dk
Thu Jul 26 10:54:42 PDT 2007


 

 

The materials and methods paper found below may be of interest to those who
study toothed whale echolocation or use passive acoustic monitoring at sea.

 

Best,

Magnus Wahlberg and Peter T. Madsen

 

Requests for reprints can be directed to 

 

Peter.madsen at biology.au.dk

Or

Magnus.Wahlberg at biology.au.dk

 

 

 

 

Recording and quantification of ultrasonic echolocation clicks from
free-ranging toothed whales


Deep Sea Research Part I: Oceanographic Research Papers

P.T. Madsen
<http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VGB-4NS2GC9-2&_u
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<http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VGB-4NS2GC9-2&_u
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#cor1> Corresponding Author Contact Information,
<mailto:peter.madsen at biology.au.dk> E-mail The Corresponding Authorand M.
Wahlberg
<http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VGB-4NS2GC9-2&_u
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#aff1> a,
<http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VGB-4NS2GC9-2&_u
ser=642076&_coverDate=05%2F18%2F2007&_alid=603396580&_rdoc=1&_fmt=summary&_o
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#aff3> c 
aZoophysiology, Department of Biological Sciences, Build. 1131, University
of Aarhus, Denmark
bWoods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
cFjord & Bælt, Margrethes Plads 1, 5300 Kerteminde, Denmark 
Received 8 October 2006;  revised 15 March 2007;  accepted 2 April 2007.
Available online 18 May 2007. 

Toothed whales produce short, ultrasonic clicks of high directionality and
source level to probe their environment acoustically. This process, termed
echolocation, is to a large part governed by the properties of the emitted
clicks. Therefore derivation of click source parameters from free-ranging
animals is of increasing importance to understand both how toothed whales
use echolocation in the wild and how they may be monitored acoustically.
This paper addresses how source parameters can be derived from free-ranging
toothed whales in the wild using calibrated multi-hydrophone arrays and
digital recorders. We outline the properties required of hydrophones,
amplifiers and analog to digital converters, and discuss the problems of
recording echolocation clicks on the axis of a directional sound beam. For
accurate localization the hydrophone array apertures must be adapted and
scaled to the behavior of, and the range to, the clicking animal, and
precise information on hydrophone locations is critical. We provide examples
of localization routines and outline sources of error that lead to
uncertainties in localizing clicking animals in time and space. Furthermore
we explore approaches to time series analysis of discrete versions of
toothed whale clicks that are meaningful in a biosonar context. 

Keywords: Toothed whale; Ultrasound; Recording; Click; Hydrophone; Array;
Echolocation 


 

 

Peter T. Madsen

Zoophysiology, Dept. of Biological Sciences

University of Aarhus

Build. 1131, C.F. Moellers Alle

8000 Aarhus C, DENMARK

 

 

 

 

 

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