One BFCS shuffling its wings this afternoon (Mon. 7th) at the Pinnacle,
Hawker.
John Brannan
Geoffrey Dabb wrote:
Today is the start of the nominal ‘low’ period for this 8-week
exercise, the framework of which is repeated below.
Martin has helpfully provided summary data for 8 of the 10 species for
28 years of the GBS – the other 2 not being recorded in gardens in the
8-week period. Of itself, this table seems to raise some interesting
points, but enough of that for now. This exercise is of course not
limited to GBS sites and extends to the whole COG area of interest.
Full Period
RAOU_number
New_name
Total # birds
# sites
A
F%
338
Fan-tailed Cuckoo
25
22
0.0021
1.3
401
Rufous Whistler
410
364
0.0344
20.8
424
Black-faced Cuckoo-shrike
2287
1586
0.1916
90.7
453
White-throated Gerygone
13
10
0.0011
0.6
463
Western Gerygone
12
9
0.0010
0.5
547
Dusky Woodswallow
175
15
0.0147
0.9
645
Noisy Friarbird
306
139
0.0256
8.0
671
Olive-backed Oriole
20
20
0.0017
1.1
Site weeks
sites active
Denominators
11934
1748
Shaun Bagley has pointed out that some of the subject birds might be
not absent but silent, which is part of the challenge. A silent
reed-warbler skulking somewhere in a reed-bed (which the ACT atlas
suggests one or two might do) would be quite a find.
*Previous message:*
*From:* Geoffrey Dabb
*Sent:* Wednesday, 2 June 2010 11:06 AM
*To:*
*Subject:* Festival of the Straggler
Putting aside those species that leave the Canberra area altogether,
we all know about those species that become a bit scarce in the local
area in the Winter months. July is the low month for several of
those species. Actually the lowest period might be something more
like 20 June – 20 July. This year let’s take a closer look at the 8
weeks ending on 31 July, starting this Sunday 6 June. There are signs
that with the wet Autumn more food might be around this Winter.
It’s a bit arbitrary, but these are the 10 species I suggest are of
main interest in this regard:
Fan-tailed Cuckoo
Black-faced Cuckoo-shrike
Australian Reed-Warbler
Rufous Whistler
Rufous Songlark
Western Gerygone
White-throated Gerygone
Noisy Friarbird
Olive-backed Oriole
Dusky Woodswallow
None impossible, some more likely than others.
If you come across any of those 10 species in the ACT/COG area 6 June
to 31 July. I would be very interested to get a report of it (with
numbers) with a view to collating the results. You could send a
report to the chatline or to me directly.
*******************************************************************************************************
This is the email announcement and discussion list of the Canberra
Ornithologists Group.
Please ensure that emails posted to the list are less than 100 kb in size.
List-Post: <>
List-Help: <>
List-Unsubscribe: <>
List-Subscribe: <>
List archive: <http://bioacoustics.cse.unsw.edu.au/archives/html/canberrabirds>
List manager: David McDonald, email
<>
|
