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.
--- 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
> the start-stop pattern to the calling (bullfrogs, cricket, and
> frogs, at least, I think). When I look at the waveform it
> at least in parts of the 75 min recording (See
> http://www.geojeff.org/tmp_rockefeller.html). There certainly
> long quiet intervals. Cricket frogs are the common callers at each
> This recording was made at an egret/heron rookery near the
> the refuge.
> Jeff Pittman
> -----Original Message-----
> From: Walter Knapp
> Sent: Friday, April 19, 2002 11:59 AM
> 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
> > >at low densities, such as at the edge of their range, species
> > >to vocalize less than at higher population densities, with a
> > >rivals nearby. Does anyone have any similar or counter
> > My observation is that most Passerines are stimulated to sing
> > birds singing near them. Not just by their own species,
either . In fact
> > they are often stimulated to sing by almost any other sound -
> > 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
> 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
> 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
> On a slightly more serious note, frogs are definitely stimulated
> by others calling. So you get much more continuous calling once
> population reaches a certain density.
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