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RFI birds per hectare, a result.

To: <>, "Birding-Aus" <>
Subject: RFI birds per hectare, a result.
From: "Philip A. Veerman" <>
Date: Thu, 6 Jul 2000 18:05:59 +1000
This is a difficult question because many birds are pretty good at hiding and no survey is perfect. The results from the COG Garden Bird Survey show this for a 3 hectare site by month continuously for 18 years. Of course there are problems of undercounting and one needs to consider the method. It also shows species diversity over the same scale. All this stuff will be in my report on the GBS, which is being worked on now. That level of detail is not in the Birds of Canberra Gardens book, although that book does show and describe averages over time (by month and long term - 17 years) individually by species, for most of the about 100 most frequently recorded species.
 
The quick answer is the total number of individual birds of all species combined, per average observer-week (the sample size is 46,222 observer-weeks) was in the vicinity of 75.6 birds for an approximately 100 metre radius plot. It is the consistency and the variation around that range, by month, year, by habitat and by observer differences and appreciating how those factors work, that is the interesting bit. All will be revealed.
-----Original Message-----
From: <>
To: <>
Date: Thursday, 6 July 2000 11:20
Subject: [BIRDING-AUS] RFI birds per hectare

Here's a tricky question - what's the average number of birds per
hectare in Australia?

Somebody at Uni asked me and I didn't know. All I could find in a
quick literature search was about 15 per hectare for woodlands. Does
anyone know of any figures for other habitats in Australia? I realise
it is going to vary depending on seasons, but I just need approximate
figures.

Cheers,
Lainie Berry

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