That is probably or likely is the number one factor, but not obviously so by a large margin. (I also regularly get about 60 species per year.) To do the analysis
to a level of detail to rank the factors could probably be done now that we have more years of data. That would require it all to be compiled again competently. It is complicated by that not all variables are independent (although that is a common situation
in statistics).
Philip
From: John Harris [
Sent: Friday, 14 December, 2018 2:53 PM
To:
Subject: Re: [canberrabirds] "Anthony Overs is not lying"
There are many factors influencing the number of species of birds observed in a GBS site, but the single greatest factor, surely, must be the location of the site. I regularly
recorded over 60 species, but that was not particularly related to my garden, although it is consciously bird-friendly, nor even to my time spent observing, but mostly because I back onto a reserve in which Ginninderra Creek is within the prescribed 100 metres
of my home. Those whose homes are adjacent to bushland must surely have a higher count, even if you restrict the count to those birds actually observed in the yard itself.
From: Philip Veerman <>
Date: Friday, 14 December 2018 at 1:51 pm
To: 'Wayne Gregson' <>
Cc: chatline <>
Subject: RE: [canberrabirds] "Anthony Overs is not lying"
As with most things on this topic, I invite people to notice that Pages 40 to 42 of The GBS Report describes in detail (with 7 graphs), aspects relating to
how many species are recorded on GBS charts and some of the variables involved in this aspect. Although that includes a bigger scope than by not including those nearby and overhead. Overall, for the charts for the first 21 years, the average number of species
per chart (i.e. a site per year or part thereof) is 41. There are many sites that include over 60 per year and those that record high number or low number or middle number of species per year are typically consistent. That is, most show very little variation
in the number of species recorded per year.
Philip
From: Wayne Gregson [
Sent: Friday, 14 December, 2018 9:29 AM
Cc:
Subject: Re: [canberrabirds] "Anthony Overs is not lying"
31 spp in two hours is very impressive!
I just checked my own records for birds actually IN our Duffy yard over 45 years (excluding those nearby and overhead) and could only get to 42 spp.
could have something to do with our rather meagre garden of course!
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