I was one of the regional organisers for SA during the last atlas push
and understand how the grid system works, so Martin's answer is no
surprise to me. But we can't be too surprised can we that Brolga have
"at last" been reported from the Barmah Forest area, it being right in
what must be a flight/migration path for them.
T.
-----Original Message-----
From:
Sent: Friday, March 02, 2007 10:02 AM
To:
Cc:
Subject: [SPAM] RE: [Birding-Aus] Brolga - Barmah State Park, Murray
River, Victoria
Hi Tony and birding-aussers, some detail for you on how bird
distribution data is shown on Atlas of Victorian Wildlife maps (and
other systems as well)
The data you refer to is based on specific locality records but shown on
published maps as grid cell records (either 5 minute or 10 minute
grids). The grid records for Brolga in the Barmah area are based on
observations of the species from Picola and Yalca North (north of
Nathalia). When these are converted to box-shaped grids the area on
maps appears to cover Barmah Forest.
I've just checked the atlas maps for the Brolga and indeed sightings for
the species in this area are ALL well outside the forest boundary.
So yes, this is '... just a quirk of reporting'. Thanks for asking this
question, a very pertinent observation on how peoples sightings are
shown on maps.
cheers, Martin
Martin O'Brien
Wildlife Biologist - Threatened Species & Communities Section
Department of Sustainability and Environment
2/8 Nicholson St.,
East Melbourne 3002
VICTORIA
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