Nasty Northern Giant Petrels

To: Rod Gardner <>, "" <>, "" <>, Kev Lobotomi <>, Birding-Aus <>
Subject: Nasty Northern Giant Petrels
From: John Graff <>
Date: Fri, 8 Nov 2013 15:49:19 +0800
Since I started going on pelagics in WA (31 July 2005), we've recorded the 
Southern: 5 - with 3 of those in one trip, July 2008 off Albany. (Off Perth: 2, 
Off Albany: 3) 
Northern: 12 (Off Perth: 1, Off Albany: 11)
UnID'd: 1 (Off Perth: 1, Off Albany: 0)

On my various seawatching trips (mostly Cape Naturaliste, some at Albany, Perth 
and Gracetown) over the same time period, I've recorded the following - though 
this may be slightly biased as I find the absence of a dark bill tip harder to 
be certain of than the presence of one when seawatching
Southern: 13 (2 white morphs) 
Northern: 25
UnID'd: 60

This is contra the accepted line that the vast majority of birds in WA waters 
are Southern, though I'm not certain what these claims are based on since they 
are typically accompanied by a comment along the lines of "most individuals are 
unidentifiable". Also not certain if they refer mostly to waters off Perth, or 
southern WA as a whole (most of my records are from Cape Naturaliste). So not 
certain if this reflects a relative change in abundance, inaccuracy in the 
original claims, mismatched data, or any combination of the three


> From: 
> Date: Tue, 5 Nov 2013 12:30:54 +1000
> To: ; ; ; 
> Subject: [Birding-Aus] Nasty Northern Giant Petrels
> In ten years of land-based seawatching off Maroubra (Mistral Point and
> Magic Point) from 1996 to 2005, I recorded 42 NGPs and 149 SGPs, with
> another 572 unidentified GPs. There may be a slight skewing, as white-phase
> SGPs (of which there were a few over the years) can of course be identified
> at a great distance.
> It might be interesting to go back to the raw data to see if there was a
> trend over those years. If there's anything interesting, I'll post it.
> Rod Gardner
> --
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