Hi Shorty, Martin, others
My understanding was that the time period for a population or species to be tickable was 3 generations of wild-bred birds – an arbitrary number but a reasonable attempt to quantify the length of
time required to pass the test of being a self-sustaining wild population.
Difficulties come when a population is sustained in part by provision of resources by humans. That’s why I’m wary of ticking the Narrabundah peafowl. But winter feeding in the northern hemisphere
has greatly extended the distribution of many small birds, as has provision of nest-boxes, so some flexibility in rule application is needed.
Steve
From: shorty <>
Sent: Wednesday, 15 January 2020 9:08 PM
To: Martin Butterfield <>
Cc: Canberrabirds <>
Subject: Re: [canberrabirds] Bush Stone-Curlew status
Thanks Martin, how long have the Magpie Goose been at Tidbinbilla? More than 10 years i suspect?
On Wed, Jan 15, 2020 at 8:53 PM Martin Butterfield <> wrote:
On Wed, 15 Jan 2020 at 20:04, shorty <> wrote:
I don't recall this discussion, perhaps i was not invited into it?
>> Pretty sure it was on this group. I'm not aware of it being private but perhaps it was an offline argument amongst a group.
What is the time frame for a bird to be tickable?
and who makes this decision?
And what qualifies them to make this decision?
>> the fact that they come from the most respected academic ornithology department in the World probably has something to do with it
Who can say that a wild bird has not joined the group?
>> Given the distance to the nearest wild group (perhaps 400km) and the lack of sightings for many years I'd rate this as unlikely and impossible to prove (unless it was
found to have a 'foreign' band)
On a side note i received a condescending email from eBird stating that Peafowl will no longer be tickable and only domestic type will be accepted. I assume Sparrow, Starling, Gold and Green Finch etc will also be removed?
On Wed, Jan 15, 2020 at 5:50 PM Martin Butterfield <> wrote:
There has also been discussion of whether the birds were tickable or not. I think the concision was “not”. The word “ chook” may have been used.
From memory the issue was the time the colony had to exist after assisted establishment to be counted as self-sustaining.
On Wed, 15 Jan 2020 at 17:09, Chris Davey <> wrote:
I suspect that the lack of records is because there is now a student from the ANU working on the birds and those who frequent MF send any observations
to her. Another thing is that I have left the project for her to run and so have not been visiting Mulligans Flat. The Friends etc would note curlews and then the observations would go to the chat-line but possibly this no longer occurs.
Also, like Superb Parrots, sightings are now old hat and not worth bothering about especially as Incidential reports but would be included in a list.
I note that you write about 2 records yet indicate the number of observations is
up from the previous year?
Chris
From: Paul
Fennell [
Sent: Wednesday, January 15, 2020 11:04 AM
To: Canberrabirds
Subject: [canberrabirds] Bush Stone-Curlew status
While I subscribe to the chatline, I tend to be a bit out of touch regarding what is going on in the bird observation world. This is the entry I propose to put in the next Annual
Bird Report. Has anyone got any comments to make on its accuracy, or what might have contributed to such a different result from the previous year, where a total of 48 birds were recorded?
Bush Stone-curlew Burhinus grallarius Reintroduced, rare resident
This species has been reintroduced to the predator free sanctuary within Mulligans Flat Nature Reserve. Declared endangered in NSW.
General: Only 1 sighting of a single bird on 17 Oct at Mulligans Flat (BoJ1). This follows 16 sightings at MFNR between Jul and Apr (BoJ1, GrB1, Bec2, W S1, DaC1 & ClJ3). 1 sighting from the adjoining suburb of Forde 1/7 Apr Forde (EbD1). Up from 11
sightings the previous year.
Paul Fennell
Editor, COG Annual Bird Report
0407105460
--
|
|
