canberrabirds
|
To: | "'martin butterfield'" <>, "'COG List'" <> |
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Subject: | A new Silvereye? |
From: | "Philip Veerman" <> |
Date: | Sat, 8 Jan 2011 16:28:19 +1100 |
Yes
Martin,
A
little bit more on this from a few days ago on
birding-aus.........
Sort of sounds interesting.
Do others see an unfortunate possible ambiguity here? In that "frequency" has
two meanings of relevance. In this case by context it appears to mean how often
something occurs in time, not the sound frequency, as in what we hear as pitch.
But then again maybe it is both, in the same way that playing a tape faster
raises the pitch...........
Philip -----Original Message-----From: [m("vicnet.net.au","birding-aus-bounces");">] On Behalf Of Laurie Knight Sent: Thursday, 6 January 2011 10:25 AM Cc: Birding Aus Subject: Re: [Birding-Aus] Urban silvereyes changing their tune Actually, the article is freely available at http://rspb.royalsocietypublishing.org/content/early/2011/01/05/rspb.201 0.2296.full On 06/01/2011, at 9:19 AM, Laurie Knight wrote: > The abstract for the paper referred to in > http://www.theage.com.au/victoria/urban-songbirds-change-their-tune-20110105-19g94.html > is as follows > Geographically pervasive effects of urban noise on
frequency and
> syllable rate of songs and calls in silvereyes (Zosterops
lateralis)
>
> Dominique A. Potvin, Kirsten M. Parris and Raoul A.
Mulder
>
> Published online before print
>
> Proc. R. Soc. B January 5, 2011,
doi:10.1098/rspb.2010.2296
>
>
> Abstract
>
> Recent studies in the Northern Hemisphere have shown that
songbirds
> living in noisy urban environments sing at higher
frequencies than
> their rural counterparts. However, several aspects of this
> phenomenon remain poorly understood. These include the
geographical
> scale over which such patterns occur (most studies have
compared
> local populations), and whether they involve phenotypic
plasticity
> or microevolutionary change. We conducted a field study of
silvereye
> (Zosterops lateralis) vocalizations over more than 1
million km2 of
> urban and rural south-eastern Australia, and compared
possible
> effects of urban noise on songs (which are learned) and
contact
> calls (which are innate). Across 14 paired urban and rural
> populations, silvereyes consistently sang both songs and
contact
> calls at higher frequencies in urban environments. Syllable
rate
> (syllables per second) decreased in urban environments,
consistent
> with the hypothesis that reflective structures degrade song
and
> encourage longer intervals between syllables. This
comprehensive
> study is, to our knowledge, the first to demonstrate varied
> adaptations of urban bird vocalizations over a vast
geographical
> area, and to provide insight into the mechanism responsible
for
> these changes.
-----Original Message-----From: martin butterfield
[ Sent: Saturday, 8 January 2011 7:16
AM This comes from today's
online The Australian;To: COG List Subject: [canberrabirds] A new Silvereye? "SCIENTISTS claim the loud hum of city traffic is causing a common Australian bird to change its tune. "A recent study has found the little city-dwelling silvereye is singing more
simply, slowly and at a higher pitch than its country cousins so its tweets can
be heard above the urban drone. |
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