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Re: impact of noise on bats

Subject: Re: impact of noise on bats
From: "Thomas Ashcraft" heliotown27
Date: Sat Nov 15, 2008 2:16 pm ((PST))
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 fireballs 
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 switch 
the radio off.

Thomas Ashcraft
New Mexico



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