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Re: impact of noise on bats

Subject: Re: impact of noise on bats
From: "Thomas Ashcraft" heliotown27
Date: Sun Nov 16, 2008 2:34 pm ((PST))

As I remember, back to 1994, the location was a bluff overlooking the 
Rio Grande River in New Mexico where there were a lot of bat caves. I 
don't remember being swarmed necessarily but rather dive bombed 
repeatedly. It was a little unnerving so I kept the radio off.

I will ask this question to my VLF colleagues and see if there are any 
similar experiences and report back if so.


werainey wrote:
> Very interesting! Was more than one bat approaching the receiver at a time? 
> What sort of 
> sounds were produced by the speaker? AFAIK there aren't many reports  of 
> foraging NAm 
> bats attracted by audio range sound. There is an expensive ultrasonic bat 
> social call 
> synthesizer used in netting surveys for an  uncommon species in the UK. 
> Bill R.
> --  
>> 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

"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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