Tony,
As I'm sure you know, vagrants are treated differently only if they got
themselves here. For a deliberately introduced feral, Australian birders
typically use a "10 years breeding in the wild" rule, because it's easy,
however as Nikolas points out that may not always make sense for things like
Ostrich and Parrots which have long lifespans. However I think with birds
breeding in the wild, 10 years could be enough to produce 3 generations
(original birds having chicks which then have chicks etc.) as just because
the original adults haven't necessarily died yet doesn't mean their
grandchildren aren't already breeding successfully. So as far as I'm
concerned, these Ostriches are as viable as the Peafowl or Pheasants on
Rottnest Island, or Guineafowl wherever it is people can tick those. If you
choose to tick ferals (and why not? They are a part of Australia's fauna
now), then I say go for them!
Regards,
Chris
On Wed, Oct 27, 2010 at 8:51 AM, Tony Russell <> wrote:
> Looks like the three generation thing is out the window then - bit silly
> anyway and impossible to apply to vagrant birds.
>
> Tony
>
> -----Original Message-----
> From:
> On Behalf Of John Tongue
> Sent: Tuesday, 26 October 2010 10:34 PM
> To: Nikolas Haass
> Cc: birding-aus
> Subject: Re: [Birding-Aus] NSW Ostriches
>
> I wonder whether everyone will wait for three self-sustaining generations
> of
> Arabian Shearwaters in Australian Territory before ticking them?? :)
>
> John Tongue
> Ulverstone, Tas.
>
>
> On 26/10/2010, at 1:12 PM, Nikolas Haass wrote:
>
> > Hi all,
> >
> > If you want to count introduced species (which in my personal opinion
> doesn't
> > really make sense), shouldn't you at least apply the "three generation
> rule" (=
> > 3
> >
> > proven self-sustaining generations)? For long-lived birds like Ostrich,
> this
> > means approximately 30-48 years of proven self-sustaining population.
> Thus, the
> > NSW Ostriches need another 10-28 years to become "tickable".
> >
> > Cheers,
> >
> > Nikolas
> > ----------------
> > Nikolas Haass
> >
> > Sydney, NSW
> >
> >
> >
> >
> > ===============================
> >
> > To unsubscribe from this mailing list,
> > send the message:
> > unsubscribe
> > (in the body of the message, with no Subject line)
> > to:
> >
> > http://birding-aus.org
> > ===============================
>
> ==========
> To unsubscribe from this mailing list,
> send the message:
> unsubscribe
> (in the body of the message, with no Subject line)
> to:
>
> http://birding-aus.org
> ==========
>
>
> ===============================
>
> To unsubscribe from this mailing list,
> send the message:
> unsubscribe
> (in the body of the message, with no Subject line)
> to:
>
> http://birding-aus.org
> ===============================
>
===============================
To unsubscribe from this mailing list,
send the message:
unsubscribe
(in the body of the message, with no Subject line)
to:
http://birding-aus.org
===============================
|
