Hi Mark,
I'd imagine that if it becomes self-sustaining again then it would
again be countable. I don't know what rules apply in Australia, but I
seem to recall the ABA has a 10 year rule i.e. they have to be
self-sustained for a minimum of 10 years. I'm glad i got to see one of
the original Mute Swans out on the river, might be a last survivor!
I also wonder what happens if they die out- do they get removed from
the national checklist or are they grandfathered in and just become
extinct introductions? I note our field guides still show White-winged
Whydah and Red Bishop, both long gone if indeed they were ever truly
self-sustaining over a decent time period, and there is always the
Ostrich of course. Are there any countable ones in Australia now?
Regards
Phil Gregory
On 09/10/2005, at 10:38 PM, Whittaker, Mark wrote:
If a population is reintroduced, does that mean it is no longer a
viable
population and therefore not twitchable?
Mark Whittaker
-----Original Message-----
From: Sue & Phil Gregory
Sent: Saturday, 8 October 2005 4:36
To:
Subject: [BIRDING-AUS] Mute Swans
hi folks,
Just back from a 33 day round Australia trip, during which time we went
via Northam weir near Perth and unashamedly twitched for Mute Swan.
There was one bird out on the river bank -yay! and the local council is
trying to reintroduce the species as they have not bred for some years.
There is a fenced enclosure near the river which held two nests and
three birds, which will presumably be able to go to the river in due
course.
I was interested to see what a high profile the white swans of Northam
have locally, figuring in the advertising literature and various local
business names, with high awareness that they are the only feral colony
remaining in Australia.
I was disappointed to see that HANZAB has no details of the history of
this site. Morecombe mentions that Mute Swans were brought to Australia
in 1886 and introductions continued into the 1920's. i was wondering
when the Northam birds were brought there, and how big the colony got,
also what size is it now? Can anyone help?
Thanks
Phil Gregory
www. cassowary-house.com.au
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