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New bioacoustic article in Naturwissenschaften Vol 99 (9)

Subject: New bioacoustic article in Naturwissenschaften Vol 99 (9)
From: Sonja Amoser <>
Date: Fri, 28 Sep 2012 10:09:15 +0200
Meike Linnenschmidt, Laura N. Kloepper, Magnus Wahlberg & Paul E. Nachtigall 
(2012): Stereotypical rapid source level regulation in the harbour porpoise 
biosonar. Naturwissenschaften 99 (9), 767-771.

Abstract: Some odontocetes and bats vary both click intensity and receiver 
sensitivity during echolocation, depending on target range. It is not known how 
this so-called automatic gain control is regulated by the animal. The source 
level of consecutive echolocation clicks from a harbour porpoise was measured 
with a hydrophone array while the animal detected an aluminium cylinder at 2, 4 
or 8 m distance in a go/no-go paradigm. On-axis clicks had source levels of 
145–174 dB re 1 μPa peak-to-peak. During target-present trials the click trains 
reached comparable source levels independent of the range to the target after 
three clicks. After an additional click, the source level was reduced for the 2 
and 4 m trials until it equalled the one-way transmission loss. During 
target-absent trials, the source level remained high throughout the entire 
click train. Given typical values of harbour porpoise inter-click intervals, 
the source level reduction commenced within a few 100 ms from the first click 
in the click train. This may indicate a sub-cortically regulated source level 
regulation in the harbour porpoise.

Kind regards

Sonja Amoser

Dr. Sonja Amoser
Steinrieglstraße 286
3400 Weidlingbach

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