I saved and uploaded a 10 minute part of the file -- there is another
screenshot of the waveform for this 10 minute section, and there is a link
at the very bottom of the web page
(http://www.geojeff.org/tmp_rockefeller.html) to the mp3 file. I also made
a 1 minute version. Listening to it again, the birds are doing a little
complaining about the frogs -- the "strange" call near the beginning is a
snowy egret I think.
Can you tell from the audio or from the waveform if it is clipped? (I
suppose that "clipped" just means that the recording level is set too high
and it "maxes" out, and thus doesn't record the full range of amplitude.)
Doesn't look like it to me, since the max peaks don't seem to line up.
Sent: Friday, April 19, 2002 9:40 PM
Subject: [Nature Recordists] Re: Vocalization intensity and speciesdensity
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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