[Top] [All Lists]

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

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU