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Re: Vocalization intensity and speciesdensity

Subject: Re: Vocalization intensity and speciesdensity
From: "richpeet" <>
Date: Sat, 20 Apr 2002 02:40:29 -0000
Check your frogs again Jeff.  I can not listen to the graph you sent 
but it looks like it may be cliped.  Those frogs are loud and that is 
very easy to do.  I blew an hour on the 15th having done that same 

Here is part of the second attempt version. both small downloads.

Good luck.

--- In  geojeff <> wrote:
> I made a couple of hour-long recordings last week at Rockefeller 
> Refuge on the Louisiana coast.  I am a rookie at this, and am 
curious about
> the start-stop pattern to the calling (bullfrogs, cricket, and 
> frogs, at least, I think).  When I look at the waveform it 
looks "periodic"
> at least in parts of the 75 min recording (See
>  There certainly 
aren't any
> long quiet intervals.  Cricket frogs are the common callers at each
> "chorus."
> This recording was made at an egret/heron rookery near the 
headquarters of
> the refuge.
> Jeff Pittman
>   -----Original Message-----
>   From: Walter Knapp 
>   Sent: Friday, April 19, 2002 11:59 AM
>   To: 
>   Subject: Re: [Nature Recordists] Vocalization intensity and 
>   Doug Von Gausig wrote:
>   >
>   > At 08:04 PM 4/18/2002, Mark Oberle wrote:
>   > >Although it might make sense, I could only find a few papers 
> that
>   > >at low densities, such as at the edge  of their range, species 
> tend
>   > >to vocalize less than at higher population densities, with a 
lot of
> singing
>   > >rivals nearby. Does anyone have any similar or counter 
>   >
>   > My observation is that most Passerines are stimulated to sing 
by other
>   > birds singing near them. Not just by their own species, 
either . In fact
>   > they are often stimulated to sing by almost any other sound - 
which is
> why
>   > so many good recordings are made just as airplanes fly by!
>   Frogs do the same thing, sing like mad while the truck or car 
>   then clam up when it gets quiet again. Very annoying sometimes. I 
>   I hear little tiny laughter in the quiet periods, that they are 
doing it
>   on purpose because I'm trying to record....
>   They have scouts that watch and when you press the record they 
>   quick quiet to everybody. Then when you hit stop they signal all 
>   Then there is the other game. Sit quiet as the recorder runs on 
and on.
>   Then time it so that just before you give up and stop they call.
>   Briefly. It's a experiment they are conducting to see just how 
>   they can call and still have that hairless ape keep trying to 
> continuously....
>   On a slightly more serious note, frogs are definitely stimulated 
to call
>   by others calling. So you get much more continuous calling once 
>   population reaches a certain density.
>   Walt
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