I don't know if anyone has looked at typical bat habitats to see if
there is any link to the geophonic (non-biological natural sound
generated in an environment) or other biophonic material. A few of the
spectrogram I've generated show pretty clearly that the bats tend to
find their own frequency/temporal niches, much as one would expect
with this thesis.
Bernie
On Nov 14, 2008, at 7:11 AM, Gianni Pavan wrote:
> Hi Bernie, I did similar thoughts. It is very likely that low
> frequency human noise doesn't affect echolocation directly (by
> masking for example). However, I'm wondering about any other possible
> effect not necessarily linked with high frequency echolocation.
>
> Gianni
>
> At 15.42 14/11/2008, you wrote:
>
> >Got some considerable stuff on large mammals, frogs and insects, but
> >not bats, Gianni. This is probably because, except for the high whine
> >of jet engines and some turbines (that tend to disperse the greater
> >the distance from the source and is more typically industrial noise
> >generated in enclosed spaces) there isn't a whole lot of anthrophony
> >(human noise) that extends out into bat ultrasonic range. Recent
> >recordings I've made with distant traffic and aircraft (both light
> and
> >commercial) haven't shown much, if any, impact for those reasons,
> most
> >likely. These are either hoary or Myotis.
> >
> >Bernie
> >
> >On Nov 14, 2008, at 12:31 AM, Gianni Pavan wrote:
> >
> > > hi all,
> > > lately I'm getting interested in the impact of noise on natural
> > > habitats. Effects of noise on birds and frogs is known.
> > > But what about bats ? Please let me know if you have any info or
> > > literature reference about the topic.
> > >
> > > Gianni
> > >
> > > ----------------------------------------------------------
> > > 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 <gpavan%40cibra.unipv.it>
> > <gianni.pavan%40unipv.it>
> > > Web <http://www.unipv.it/cibra>http://www.unipv.it/cibra
> > > ----------------------------------------------------------
> > >
> > >
> > >
> >
> >
> >
> >Nessun virus nel messaggio in arrivo.
> >Controllato da AVG - http://www.avg.com
> >Versione: 8.0.175 / Database dei virus: 270.9.3/1786 - Data di
> >rilascio: 13/11/2008 18.01
>
> ----------------------------------------------------------
> 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
> ----------------------------------------------------------
>
>
>
>
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