canberrabirds

Bronzewings still sitting, sitting, sitting...

To: Philip Veerman <>
Subject: Bronzewings still sitting, sitting, sitting...
From: Dennis Ayliffe <>
Date: Thu, 2 Aug 2012 07:59:36 +1000
Thanks for all that. I am pretty sure they are sitting on something as they are still swapping over sitting duties regularly (twice a  day). I have not seen a swap over so have not had an opportunity to see the nest contents even if it would be for a second or so. Nevertheless will continue to monitor and report on anything significant.
Regards
Dennis Ayliffe
On 01/08/2012, at 5:42 PM, Philip Veerman wrote:

Hi Dennis,
 
I suggest, most likely but not yet certain that the breeding has failed, which would not seem odd, given that it is through mid winter. To expand on Geoffrey's comment there are various possibilities:
 
1    Eggs might be infertile and they are still incubating.
2    Eggs might be fertile but embryos have died and they are still incubating.
3    Might not be on eggs now.
4    Maybe the start time you noticed is wrong as in they may have started sitting before eggs were laid (unless you know when eggs appeared).
5    Maybe the start time is now wrong if they had one clutch that failed e.g. through predation and they laid a second clutch, and you would not have known, so the start time needs to be reset. So the nest might still be successful.
6   Maybe chicks have hatched recently and they are still so small that you have not seen them yet.
 
Whilst I am on it, I will mention, having just noticed in checking this book for anything useful to add, that Betty Temple Watts also did the paintings for H.J. Frith's book Pigeons and Doves of Australia.
 
Philip
 
 
-----Original Message-----From: Geoffrey Dabb [ Sent: Wednesday, 1 August 2012 4:00 PM      To: 'Canberra Birds'
Subject: RE: [canberrabirds] Bronzewings still sitting, sitting, sitting...

3 refs give 14-16 days for incubation.  Eggs might be infertile or might not be on eggs now
 
From: Dennis Ayliffe [ Sent: Wednesday, 1 August 2012 12:46 PM      To: Canberra Birds
Subject: [canberrabirds] Bronzewings still sitting, sitting, sitting...
 
The bronzewing pigeons nesting in my garden have today entered their 4th week of sitting. My meagre resources don't give any figures for incubation time for the species. Does anybody out there have any information that might help me figure out 
what may be going on?
Cheers and regards
Dennis Ayliffe

0400168825



Dennis Ayliffe

0400168825


<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the Canberra Ornithologists Group mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the list contact David McDonald, list manager, phone (02) 6231 8904 or email . If you can not contact David McDonald e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU