[MARMAM] new publication on narwhal echolocation

Jens Koblitz Jens.Koblitz at bioacousticsnetwork.org
Thu Nov 10 07:25:31 PST 2016


Dear colleagues,

my co-authors and I are pleased to announce the publication of our work 
on the directionality and scanning of narwhals in PLoS ONE:

Koblitz JC, Stilz P, Rasmussen MH, Laidre KL (2016)

Highly Directional Sonar Beam of Narwhals (/Monodon monoceros/) Measured 
with a Vertical 16 Hydrophone Array

PLoS ONE 11(11): e0162069. doi:10.1371/journal.pone.0162069


The paper is available as OPEN ACCESS here:

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0162069


Abstract:

Recordings of narwhal (/Monodon monoceros/) echolocation signals were 
made using a linear 16 hydrophone array in the pack ice of Baffin Bay, 
West Greenland in 2013 at eleven sites. An average -3 dB beam width of 
5.0° makes the narwhal click the most directional biosonar signal 
reported for any species to date. The beam shows a dorsal-ventral 
asymmetry with a narrower beam above the beam axis. This may be an 
evolutionary advantage for toothed whales to reduce echoes from the 
water surface or sea ice surface. Source level measurements show narwhal 
click intensities of up to 222 dB pp re 1 μPa, with a mean apparent 
source level of 215 dB pp re 1 μPa. During ascents and descents the 
narwhals perform scanning in the vertical plane with their sonar beam. 
This study provides valuable information for reference sonar parameters 
of narwhals and for the use of acoustic monitoring in the Arctic.


Cheers,

Jens



-- 

Dr. Jens C. Koblitz

BioAcousticsNetwork

Eichenallee 32 a
41469 Neuss
Germany

Office: +41 (0) 56 55 876 20
Cell: +49 (0) 1512-2236452

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