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Re: impact of noise on bats

Subject: Re: impact of noise on bats
From: "werainey" werainey
Date: Sat Nov 15, 2008 7:49 pm ((PST))
--- In  Thomas Ashcraft <>
> werainey wrote:
> > Bernie,
> > There's some older commentary on  noise from flowing water affecting
foraging by bats. In
> > 1986 Herd reported on noise from fast and slow flowing water (up to
80 kHz), noting fast
> > flowing water was louder up to about 70 kHz. He discussed two
species of North American
> > Myotis that often hunt near water and pointed out that the species
with the higher typical
> > echolocation frequency (50 kHz) was commonly encountered hunting
over fast while the
> > other (40 kHz) was not. This is not exptl study like the one Gianni
mentioned, so other
> > factors could be involved.
> >
> >
> >
> >
> For what it's worth, one time I was monitoring for meteors and
> with a handheld McGreevy WR-3 ELF/VLF radio receiver which operates at
> between 0.2 - 11 kHz. Whenever I switched on the radio bats would go
> into a frenzy and dive right down to the radio.  I'm not sure if they
> were attracted to the sound or if it was annoying them.  After a few
> moments of bats diving at my handheld radio I got the message to
> the radio off.
> Thomas Ashcraft
> New Mexico

"While a picture is worth a thousand words, a 
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause

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