According to C and B,
Payne and Risley (1976) first suggested that the two should be split based on
breeding plumage differences.
Cytochrome-b sequence distances (McCracken and Sheldon 2002) are more
consistent with keeping them as subspecies.
The issue of whether they are species or ssp has been bouncing around for a
while, but this isn't where the original conversation started by John P in
relation to mixing of the two taxon.
I am very keen to see photos of evidence the two forms are mixing because I
having found any yet, maybe Bharat's forthcoming paper in Dutch Birding will
address exactly this issue.
Cheers Jeff.
-----Original Message-----
From:
On Behalf Of David James
Sent: Tuesday, 30 August 2011 6:36 PM
To: Bharat Jethva; ; John Penhallurick
Cc: 'Birding-aus'
Subject: Re: [Birding-Aus] [OB] Eastern Cattle Egret
From memory I think the first suggestion of a potential split was in McAllan &
Bruce (late 1980s) checklist of the birds of the state of NSW in Australia,
which was privately published. My copy is in storage so I can't check right
now. I think it was based on differences in bare parts colours in breeding
plumage and a gap in the range in the Middle East, but not a full taxonomic
study. I think Sibley & Monroe may have followed McAllan & Bruce, as they
tended to adopt almost any published split. From there it has gradually gained
support and "legitimacy" but has not been studied rigorously. Many splits are
based on similar histories of minimal taxonomic assessment. Some are probably
good, but many are bad decisions and all are poor process. It's only really
different definitions of species, the two refs I mentioned both recognised
"allospecies".
Cheers
David James,
Sydney
==============================
From: Bharat Jethva <>
To: ; John Penhallurick <>
Cc: 'Birding-aus' <>
Sent: Tuesday, 30 August 2011 5:47 PM
Subject: Re: [OB] Eastern Cattle Egret
Dear Dr John Penhallurick,
I agree with you, I also don't think that it could be a separate species ! I
hope they have done detailed research when they accept it !
Best wishesDr. Bharat Jethva
--- On Tue, 30/8/11, John Penhallurick <> wrote:
From: John Penhallurick <>
Subject: [OB] Eastern Cattle Egret
To:
Cc: "'Birding-aus'" <>
Date: Tuesday, 30 August, 2011, 12:39 PM
Hi friends,
I have been surprised to see that some authorities, including
worldbirdnames, have accepted the split of the Eastern Cattle Egret from the
taxon found in the rest of the world. Given the way that Cattle Egrets have
spread so widely around the world in such a relatively short time, I find it
hard to believe that gene flow could have been interrupted long enoguh for a
new species to emerge.
I would welcome any thoughts.
Dr John Penhallurick
86 Bingley Cres
Fraser A.C.T. 2615
Australia
email:
Phone: Home (612) 62585428
Mobile:0408585426
sunt lacrimae rerum et mentem mortalia tangunt Aeneid Book 1,line 462 "The
world is a world of tears, and the burdens of mortality touch the heart."
Magna est veritas et praevilabit Vulgate, Book of Edras
Si vis pacem para bellum Publius Flavius Vegetius Renatus
<http://en.wikipedia.org/wiki/Publius_Flavius_Vegetius_Renatus> 's De Re
<http://en.wikipedia.org/wiki/De_Re_Militari> Militari, book 3
Please visit my website:http://www.worldbirdinfo.net
Please also visit my blog at
http://jpenhall.wordpress.com/2011/04/02/proof-that-there-is-not-a-scrap-of-
evidence-in-favour-of-the-ipccs-attack-on-carbon-dioxide/
[Non-text portions of this message have been removed]
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