A small comment, in view of my long-running campaign to have those labels rationalised. It is good the ABR splits off ‘rare’, ‘common’ etc (although these need definition).
‘Resident’ should mean all or nearly all individuals remain in the COG area year round. ‘Migrant’ should refer to a regular pattern of all or nearly all individuals leaving the COG area altogether each year. If only members of an age-class (eg juveniles) remain year-round that should not make a species ‘resident’.
‘Resident/ Migrant’ should mean that some individuals remain year round (not just juveniles unless this is stated in a definition) and some leave the COG area altogether (if indeed that is known).
‘Breeding’ should not be attached to the noun, but should be a separate annotation meaning ‘breeding recorded’.
There may be other understandings of what the labels mean, but they should be stated.
From: martin butterfield [
Sent: Monday, 3 September 2012 6:04 PM
To: wallaces
Cc:
Subject: Re: [canberrabirds] Hobbies
I note that the description of this species in the Annual Bird Report is Breeding Resident /migrant. Presumably the bimodal graph reflects the Twin Peaks of migration in both directions.
Martin
On 3 September 2012 17:49, wallaces <> wrote:
Attached is a graph of the number of Australian Hobbies observed and the number of breeding records by month for the last 31 years of data on the COG database. It shows the pattern similar to Philip's description but also shows a peak in October.
