|To:||"Ross Silcock" <>|
|Subject:||Red-billed vs Silver Gulls|
|From:||"Frank O'Connor" <>|
|Date:||Sat, 26 Jul 2003 19:43:33 +0800|
At 14:40 24/07/2003 -0500, Ross Silcock wrote:|
Interesting discussion by Rohan on diffs between Silver and Red-billed
Have I read this correctly that you are suggesting that you can identify the two based on whether there is a window in P8?
I don't think that this is true? Ron Johnstone at the WA Museum published a paper on Silver Gulls in Australia :
Johnstone, R.E., Distribution, Status and Variation of the Silver Gull Larus novaehollandiae Stephens, with Notes on the Larus cirrocephalus species-group, Records of the Western Australian Museum 1982, 10(2):133-165
He says that he can identify Silver Gulls to which part of Australia that they bred based on the size and number of primary windows, and a few other characteristics such as the tips of the primaries.
In particular, the Silver Gull north of Shark Bay in WA doesn't have a window in P8. Similarly in the Recherche Archipeligo on the south coast of WA. In between the window is very small. In New Caledonia, only P10 has a window.
Ron sent me this paper, when I was asking about a gull I saw in Broome in February 2002 with no windows in the primaries and a longer slender bill. I wanted it to be a Slender-billed Gull, but I had to conclude that it was a Silver Gull, maybe from the New Caledonia population.
Frank O'Connor Birding WA http://birdingwa.iinet.net.auPhone : (08) 9386 5694 Email : Birding-Aus is on the Web at www.shc.melb.catholic.edu.au/home/birding/index.html To unsubscribe from this mailing list, send the message "unsubscribe birding-aus" (no quotes, no Subject line) to
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