From: Chris Davey
Sent: Tuesday, 16 June 2009 7:50 PM
To: martin butterfield; Julian Robinson
Cc: canberrabirds chatline
Subject: Re: [canberrabirds] Myna traps and numbers
this rate we should run a sweep on when the bird is eradicated from Canberra!
Original Message -----
Sent: Tuesday, June 16,
2009 6:03 PM
Subject: Re: [canberrabirds]
Myna traps and numbers
For those who missed my chat
the other night I have attached the graph to which Julian refers. It even
has labels on the axes! For assessing the Minister's rhetoric it is
better to focus on the blue line (original values) than the dotted, trend line.
Although the release of this data was nothing to do with me (I wasn't aware of
the comments until pointed out to me on a run at lunchtime today) and it is
rare for me to agree with any of the local politicians about anything, I
do tend to think that 'plummeting' is a reasonable word. From the Common
Myna's largest recent value of A ( I couldn't bring myself to say
'high point') at 4. 9587 in year 25 the value has declined by 52.3% in 2 years
to 2.3611. For those of an actuarial persuasion I think this comes out to
a compounding decrease of close to 31% per annum which is rather
Another way of looking at the outcome is that the value of A for Common Myna in
2007-08 is below that for the species in 1990-91! Again I reckon this is
The very highest values of A for this species occured in 2000-01 (year 20,
5.1588) and 1998-99 (year 18, 5.4021). As I inferred last week, I haven't
attempted to explain the decreases between those years and year 25.
However they were not as dramatic as that between years 25 and 27.
Perhaps COG should run a sweep on the value of A for year 28? Although I
hate forecasting, if the decrease continues at the same % rate as for the last
2 years it should be around 1.6.
On Tue, Jun 16, 2009 at 11:42 AM, Julian Robinson <>
Minister Hargreaves has learned from CIMAG that "Indian Myna numbers have
been plummeting". I'd have thought from the graph presented by
Martin the other night that plummeting might be too strong a word.
PRISONERS TRAP MYNA BIRD MENACE
Published: June 16, 2009, 8:47 am
Section: John Hargreaves, MLA | Media Releases
Minister for Corrections, Mr John Hargreaves MLA, today announced that
prisoners from the Alexander Maconochie Centre will provide much needed
assistance to the Canberra Indian Myna Action Group (CIMAG) by constructing
their specialised Indian Myna bird traps.
"I am very pleased to announce that ACT Corrections is incorporating
positive environmental projects within the prisoners' daily schedules,"
said the Minister.
"Discussions have been taking place for a while between officers from ACT
Corrections and CIMAG regarding the scoping and requirements for this trap
construction project and I expect this endeavour to commence before the end of
the financial year."
The Indian Myna bird is an invasive exotic bird species that takes over nesting
hollows from native birds and small mammals. CIMAG formed as a community action
group to reduce the impact of the Indian Myna on Canberra's native birds and
animals. CIMAG will provide the discrete training necessary for prisoners to construct
these traps. The skills gained through this trap construction program can be
incorporated within the prisoners' Vocational Education Training programs.
"I am very supportive of the work that CIMAG has achieved to date through
their Indian Myna trapping program," said Mr Hargreaves.
"When CIMAG originally formed in 2006, the Indian Myna was the third most
abundant bird species in Canberra. Since that time, I have been pleased to
learn that their numbers have been plummeting,' he said.
"The recent Garden Bird Survey conducted by the Canberra Ornithologists
Group has seen this invasive exotic species drop to the twelfth most abundant
bird species in our gardens," stated the Minister. "This is no small
achievement by CIMAG and they are to be applauded for their efforts. However I
am pleased to be able to support this ongoing project of CIMAG by having the
prisoners construct these specialised traps."
"The work of the prisoners will help reduce the significant backlog in
orders from the community for the traps.' said Minster Hargreaves.
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