Cumulative GBS species

To: Philip Veerman <>, 'COG List' <>
Subject: Cumulative GBS species
From: John Harris <>
Date: Mon, 30 Oct 2017 21:14:57 +0000
The influx of new species is probably due in part to me. I was slack this year in reporting and it was months before I got around to transferring my written GBS lists to eBird. My lists would have contained birds like Nankeen Night Heron which may not yet have been reported. While Philip is right that rural sites are obviously more productive than sites on the middle of suburbia, a few of us are privileged to live on an urban site with water within our 100 metre radius.
I back onto Ginninderra Creek Nicholls below Percival Hill which is the flight corridor between the northern lakes and ponds so I get to report spoonbills etc in my GBS. Also from time to time almost everything which comes down from Percival Hill.
I chose this block purposely when down sizing. So it is observers like me who contribute some of the more unusual birds to the GBS survey

From: Philip Veerman <>
Sent: Monday, October 30, 2017 2:43:31 PM
To: 'COG List'
Subject: RE: [canberrabirds] Cumulative GBS species

Sort of similar to Figure 14 of The GBS Report (which of course pools data for all GBS charts). Martin’s graph is a usual representation of the trend being described, although the end point 75 - 80 species for a year is higher than most of us achieve on the GBS. Due no doubt to available out of town habitat and ability & effort undertaken by observer.




From: Martin Butterfield [
Sent: Monday, 30 October, 2017 12:40 PM
To: COG List
Subject: [canberrabirds] Cumulative GBS species


One of my small games with my GBS records is to track the cumulative number of species seen GBS-year to date.  


This year started off slowly and fell further behind the 10 year average until it was nearly 9 species behind by early September.  Since then the additional species have poured in and I'm now 2 species ahead of the average (with lots of previously seen species to add).  


I have graphed the two series starting with week (starting week 32 to avoid any complications caused by variations in the timing and duration of our Winter absences).

I usually end up with 75 - 80 species for a year.  This year with an ounce of luck, a pound of axle grease and reasonable rainfall
I could expect as many as 85 species.


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