Simple. We've done studies with Western spadefoot
frogs where we wanted to see what of the vox was
transmitted through water. Using a hydrophone for
one channel and a mic (to capture correlated
airborne sound) into the other unput, we got both
and have some good data. Done the same w/ hippos
in the Selous (Southern Tanzania).
Bernie Krause
>Hi Walt,
>
>Sounds interesting! How do you record frogs with your
>hydrophone?
>
>Tony Celis
>
>
>
> --- Walter Knapp <> escribi=F3:
>
>> Posted by: "Bruce Wilson"
>>
>> > Anyone know Gordon Hempton? He's got one where he
>> has a recording of an
>> > underground river, and I'm curious how you get
>> that without a drilling rig.
>>
>> A geophone, or a hydrophone can do that without
>> drilling. Sound carries
>> well underground. Just bury your hydrophone with a
>> shovel to dig a small
>> hole. Or even just drop it in a small pool of water
>> and it will pick up
>> the surrounding soil sounds. I have problems when
>> recording frogs with
>> my hydrophone of noise pollution from nearby wells
>> and such like.
>>
>> Or Gordon could have done it in a cave with a
>> regular mic, though I
>> don't know that recording to know.
>>
>> Walt
>>
>>
>
>
>Antonio Celis Murillo
>Center for Conservation Biology
>University of California Riverside
>
>208 University Laboratory Building
>Riverside, CA 92521-0334
>(951) 827-5484
>
>
>
>
>
>
>
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>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
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