John,
sound production (stridulation) is widespread among Coleoptera.
Dytiscidae do produce sound; I don't know about Elmidae. Dytiscidae,
also called diving beetles, are much more water adapted than Elmidae.
For a closer, but still preliminary, identification look at
http://ltreadwell.ifas.ufl.edu/insects/09Coleoptera.htm Unfortunately
most identification tables don't tell about sound!
Gianni
At 07.07 23/02/2007, you wrote:
>Gianni,
>
>Thank you for the additional clues. From what you and Bernie have
>written, what I recorded is likely an insect and not a frog.
>
>I found a recent publication by The Xerces Society for Invertebrate
>Conservation for my local area:
>
><http://www.columbiaslough.org/PDFs/Bugs/2006_June_Handbook3b.pdf>http://www.columbiaslough.org/PDFs/Bugs/2006_June_Handbook3b.pdf
>
>It has some descriptions of the beetles in those waters. The photo
>closest to resembling what I think I saw is the riffle beetle
>(Elmidae) on page18.
>
>Perhaps I'll pass my recording along to the author and see what he
>thinks. And, I must return soon to record and observe again: maybe
>I'll find something more definitive.
>
>John Hartog
>
>--- In
><naturerecordists%40yahoogroups.com>
>Gianni Pavan <> wrote:
> >
> > the sounds seems to be stridulations made by some aquatic insect. I
> > often recorded similar sounds from some species of Ditisicidae
> > (Coleoptera). A specimen is of course required to make a correct
> > identification.
> >
> > Gianni
> >
>----------------------------------------------------------
> > Gianni Pavan
> > Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
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> > Phone +39-0382-987874 Fax +39-02-700-32921
> > Email
> > Web <http://www.unipv.it/cibra>http://www.unipv.it/cibra
> >
>----------------------------------------------------------
> > CIBRA organizes the XXI IBAC Congress, Pavia, 15-18 September 2007
> >
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>
> >
> >
> >
> >
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Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA
Phone +39-0382-987874 Fax +39-02-700-32921
Email
Web http://www.unipv.it/cibra
--------------------------------------------------------------------------------------------------------
CIBRA organizes the XXI IBAC Congress, Pavia, 15-18 September 2007
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