Thank you Doug!
Lang
Today, August 8th, marks the 4th anniversary of the Nature Recordists
e-mail group, happy anniversary, all!
We now have more than 710 world-wide members, and there have been over
15,100 posts since we started discussion our passion!
Thanks to Jim Morgan for his excellent moderation, and to each and every
one of the members for their selfless participation. I know we have made a
difference!
Doug
Doug Von Gausig
Clarkdale, Arizona, USA
Moderator
Nature Recordists e-mail group
http://groups.yahoo.com/group/naturerecordists
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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>From Tue Mar 8 18:27:52 2005
Message: 10
Date: Sun, 8 Aug 2004 20:08:14 -0400
From: "Wil Hershberger" <>
Subject: RE: Happy Anniversary, Nature Recordists!
Yes; a big congratulation to all. This is certainly the best community
for nature recording enthusiasts.
I am looking forward to many, many more years of excellent information
and camaraderie.
Thank you all,
Wil Hershberger
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>From Tue Mar 8 18:27:53 2005
Message: 11
Date: Sun, 8 Aug 2004 20:11:02 -0700
From: "Jim Morgan" <>
Subject: Ultrasonic alarm call for Richardson's ground squirrel
The following message has been posted by Jim Morgan for Greg Clark, a Nature
Recordists member, that is having temporary posting dificulities.
In the 29 July 2004 issue of "Nature" there is an article concerning an
ultrasonic alarm call for Richardson's ground squirrel (Spermophilus
richardsonii) (The authors refer to Canada in the article) . The alarm call
frequency is very narrow, close to 50khz, and short, only 238 ms. The
authors comment "To our knowledge, ultrasonic alarm calls have not
previously been detected in any animal group, despite their twin advantages
of being highly directional and inaudible to key predators." The authors
used playback and a pure tone at the dominant call frequency (along with
other control tones) to investigate the behavior of the squirrels. The pure
tone elicited "vigilant" behavior similar to the native call.
I have two species of ground-dwelling squirrel that live in my backyard in
Arizona and I have a means of down-sampling the high frequencies so that I
can detect them. Perhaps I will hear a short click when the squirrels see
me. Those of us who have the means to detect ultrasonic signals, and are
around squirrels (especially ground squirrels) probably should have a
listen for these frequencies in case they are found in other squirrels.
I don't have a transducer that would transmit ultrasonic tones, but this
might be another way to see if the squirrels take notice. I imagine the
dogs in the neighborhood would be interested.
Greg Clark
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