Who is to say that 3 generations haven't bred over 20 years? Also,
considering you don't know the age of the original
stock..................
Yours in all things "green"
Regards
John Harris
Manager, Environment and Sustainability
Donvale Christian College
155 Tindals Rd Donvale 3111
03 9844 2471 Ext 217
0409 090 955
President, Field Naturalists Club of Victoria (FNCV)
Past President, Victorian Association for Environmental Education
(VAEE)
>>> "Tony Russell" <> 26/10/2010 2:59 PM >>>
Aha ! But if you don't apply the 3 generation rule you can tick them
earlier.
Tony
-----Original Message-----
From:
On Behalf Of Dave Torr
Sent: Tuesday, 26 October 2010 1:52 PM
To: Nikolas Haass
Cc: birding-aus
Subject: NSW Ostriches
Whether one counts them or not is a matter of personal preference -
however
it is important that people record such things (if they are going to
record
sightings at all) else it becomes hard in later years to track the
spread of
such species. There seems to be a tendency in some places to only
record
"natives" and ignore everything else.
On 26 October 2010 14:12, 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
>
>
>
>
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