FW: [canberrabirds] GBS? again

["Philip Veerman" <>]

Hi All,

Apologies, somehow my extract got corrupted in the copying to the email below. The phrase about (supported by the questionnaire survey of 1988), mysteriously moved. That part should be:

There is a clear impression (supported by the questionnaire survey of 1988), that the variation relates to the combination of effort put in, habitat involved and experience level of the observer. There is little doubt that observers differed in their interpretation of the instruction (which varied on the different chart versions) to include birds within the 100 metre radius area. This surely played a role in the variation of number of species (records) per chart.

And this is the graph:

 

 

 

Philip Veerman

24 Castley Circuit

Kambah  ACT  2902

 

02 - 62314041

-----Original Message-----
From: Philip Veerman [
Sent: Thursday, 9 July 2009 10:21 PM
To: 'Tobias Hayashi';
Subject: RE: [canberrabirds] GBS?

Hello Tobias,

 

Here is the extract from the most relevant part of the GBS Report, to address that issue (from page 36). Although taken out of context and without the graphs it is a bit dry reading. Sorry- in context it is better. Although of course that refers to the 1316 charts in the first 21 years, not the results from 2008/09. So, 60 species on a chart is a good effort.

 

The range of number of species recorded on individual charts is broad. Figure 18 shows the spread. This is partly influenced by the number of observer-weeks as shown later with Figure 23. The lowest score was on five charts that recorded only 13 species, up to one (Year 13 at Site 248) that recorded 99. Only 12 charts had over 75 species. The mean, mode and median of species (i.e. number of records) per chart are 41.16, 36 & 39 (respectively). There is a clear impression (supported by the observers differed in their interpretation of the instruction (which varied on the different chart versions) to include birds within the 100 metre radius area. This surely questionnaire survey of 1988), that the variation relates to the combination of effort put in, habitat involved and experience level of the observer. There is little doubt that played a role in the variation of number of species (records) per chart.

 

Philip Veerman

24 Castley Circuit

Kambah  ACT  2902

 

02 - 62314041

-----Original Message-----
From: Tobias Hayashi [
Sent: Monday, 6 July 2009 1:14 PM
To:
Subject: [canberrabirds] GBS?

Hi All,

I was wondering how everyone ' s GBS sites went last year (well the GBS year that just past). This was the first year I did it.

I was surprised to turn up 60 species for the whole year, which I thought was very good, and certainyl worthwhile repeating. What does everybody else get? I suppose the rural sites may get more, depending where they are.

Any really notable amazing birds?

Oh well, its the holidays for me (thats probably why I'm writing:)))

 

Cheers

Tobias