Very vocal GBB around the house from 0730; still calling from
Rocky Knob on this brilliant morning
From: martin butterfield
[
Sent: Wednesday, 9 April 2008 6:38 PM
To: Suzanne Edgar
Cc: Geoffrey Dabb;
Subject: Re: [canberrabirds] Butcherbird in Wanniassa??
The latest Annual Bird Report (ABR) comments on the
magnitude of the increase in abundance of this species in year 26 and
there is no need to repeat that text here.
I have attached two graphs from the GBS showing the numbers
of birds (note not the A value - that wasn't necessary for this brief analysis)
for the sites in suburban Canberra. They are firstly by year (supporting
the ABR analysis) and then by week over the 26 years (as we are currently in
week 15 this supports Geoffrey's comment that this is peak butcherbird viewing
time).
By restricting the population of the analysis to the
sites in suburban Canberra there is no possible impact of rural sites
in NSW in these data.
