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BOURC TSC 7th Report

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Old Thursday 8th September 2011, 19:23   #1
Richard Klim
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BOURC TSC 7th Report

Sangster, Collinson, Crochet, Knox, Parkin, Svensson & Votier 2011. Taxonomic recommendations for British birds: seventh report. Ibis 153(4): 883-892. [abstract]

Represents a major catch-up. Recommendations include:
  • Split Pterodroma cahow Bermuda Petrel from P hasitata Black-capped Petrel.

  • Split Rallus indicus Brown-cheeked Rail from R aquaticus Water Rail.

  • Split Charadrius nivosus Snowy Plover from C alexandrinus Kentish Plover.

  • Split Numenius hudsonicus Hudsonian Whimbrel from N phaeopus Eurasian Whimbrel.

  • Split Stercorarius antarcticus Brown Skua, S chilensis Chilean Skua and S maccormicki South Polar Skua from S skua Great Skua.

  • Split Sterna acuflavida Cabot's Tern from S sandvicensis Sandwich Tern.

  • Synonymise Uria aalge hyperborea with nominate.

  • Transfer Lunda cirrhata to Fratercula.

  • Split Riparia diluta Pale Martin from R riparia Sand Martin.

  • Transfer Acrocephalus aedon, Hippolais caligata, H rama, H opaca and H pallida to Iduna.

  • Transfer Zoothera sibirica to Geokichla.

  • Transfer Luscinia cyane and L sibilans to Larvivora.

  • Transfer Luscinia calliope to Calliope.

  • Split Saxicola maurus Siberian Stonechat and S rubicola European Stonechat from S torquatus African Stonechat.

  • Transfer Carduelis chloris, C sinica, C ambigua and C spinoides to Chloris.

  • Split Pyrrhula murina Azores Bullfinch from P pyrrhula Eurasian Bullfinch.

  • Revise generic arrangement of Parulini...
    [Refer to: van den Berg 2011. Dutch Birding-vogelnamen / bird names. Aug 2011.]

Last edited by Richard Klim : Friday 9th September 2011 at 07:59. Reason: Parulini > DB
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Old Thursday 8th September 2011, 20:04   #2
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Has the full article been released yet?
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Old Thursday 8th September 2011, 20:59   #3
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Old Thursday 8th September 2011, 21:32   #4
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I know some British birders who will be quite happy with this!

I am kind of surprised though at some of the recommendations. I wouldn't suspect a ruling on Brown-cheeked Rail for instance, since I figured it would be extralimital. Are there records?

Also, wow...that Bermuda Petrel split is pretty behind...
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Old Thursday 8th September 2011, 21:37   #5
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yes...the full article is available (at least stateside)
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Old Thursday 8th September 2011, 21:41   #6
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How long does it usually take for the BOU to implement the TSC's recommendations? Am starting to regret not going for the Walney Whimbrel now
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Old Thursday 8th September 2011, 21:46   #7
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Also time to re-visit the Rossal point kentish Plover from 1992 as well..........
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Old Thursday 8th September 2011, 21:49   #8
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Am I right in thinking there have been two skuas in the UK positively ID'ed as being part of the Brown group - the Oct 2001 bird on St Agnes and one from Aberdaron in early 2002?
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Old Thursday 8th September 2011, 21:54   #9
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Extralimital splits

Quote:
Originally Posted by Mysticete View Post
I am kind of surprised though at some of the recommendations. I wouldn't suspect a ruling on Brown-cheeked Rail for instance, since I figured it would be extralimital.
I think it's useful to clarify the scope of the species on the British List, as recognised by BOURC, even where splits are extralimital (eg, as AOU does with the North American list). Much better than waiting until a Pacific Diver, Northern Harrier, Thayer's Gull etc shows up before deciding if it's a valid split or not. But I don't expect we'll be seeing a Brown-cheeked Rail anytime soon...

Last edited by Richard Klim : Thursday 8th September 2011 at 22:35.
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Old Thursday 8th September 2011, 21:59   #10
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Quote:
Originally Posted by Richard Klim View Post
I think it's useful to clarify the scope of the species on the British List, as recognised by BOURC, even where splits are extralimital (eg, as AOU does with the North American list). Much better than waiting until a Pacific Diver, Northern Harrier, Thayer's Gull etc shows up before deciding if it's a valid split or not. But I don't expect we'll be seeing a Brown-cheeked Rail anytime soon...
Might not see it, but it could very well turn up!

Rails are inveterate wanderers and we surely get European WR in winter, could one come just that bit further?

Any one know of any West Pal records?

GH
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Old Thursday 8th September 2011, 21:59   #11
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Originally Posted by upton-till-i-die View Post
How long does it usually take for the BOU to implement the TSC's recommendations?
Just until the next BOURC report (usually annual, and published in the January Ibis).
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Old Thursday 8th September 2011, 22:03   #12
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Quote:
Originally Posted by Richard Klim View Post
[*]Split Stercorarius antarcticus Brown Skua, S chilensis Chilean Skua and S maccormicki South Polar Skua from S skua Great Skua.
Curious, because the paper on identity of vagrant British South Polar Skuas, basically, claims that there is hybridization, differences are subtle and British vagrants couldn't be identified neither on plumage nor DNA. Seems really stringing to call them species, then...
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Old Thursday 8th September 2011, 22:18   #13
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'Southern skuas'

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Originally Posted by upton-till-i-die View Post
Am I right in thinking there have been two skuas in the UK positively ID'ed as being part of the Brown group - the Oct 2001 bird on St Agnes and one from Aberdaron in early 2002?
Both records are accepted by BBRC and BOURC as 'Southern Skua', race undetermined but of one of the subspecies maccormicki, antarcticus, hamiltoni or lonnbergi - ie South Polar Skua Stercorarius maccormicki or Brown Skua S antarcticus.
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Old Thursday 8th September 2011, 22:43   #14
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Where would this leave the recent 'Cayenne Tern' at Cemlyn? I assume that also falls under Cabot's Tern?
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Old Thursday 8th September 2011, 22:49   #15
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Cayenne Tern

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Where would this leave the recent 'Cayenne Tern' at Cemlyn? I assume that also falls under Cabot's Tern?
Yes, but only if/when proven to be a Cayenne Tern Sterna acuflavida eurygnatha.
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Old Friday 9th September 2011, 08:27   #16
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The eventual split of Siberian Stonechat is interesting and has been long talked about.
Thick-billed Warbler getting transferred to Iduna was a bit of a surprise (to me anyway).

Re the split of Bermuda and Black-capped Petrel - this must have been researched for a long, long time; the link to the abstract of the Ibis page refers to studies by Jesus et al...

Last edited by Mark Newsome : Friday 9th September 2011 at 08:30.
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Old Friday 9th September 2011, 08:59   #17
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As I read it Saxicola maurus Siberian Stonechat and S rubicola European Stonechat stay together, but both are split from S torquatus African Stonechat.
So Siberian Stonechat is not yet split.
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Old Friday 9th September 2011, 09:40   #18
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Stonechats

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Originally Posted by gerrywestdean View Post
As I read it Saxicola maurus Siberian Stonechat and S rubicola European Stonechat stay together, but both are split from S torquatus African Stonechat.
So Siberian Stonechat is not yet split.
No, the split is into three species (as stated in post #1) - as already recognised by CSNA, Urquhart & Bowley 2002, IOC, OSME:
  1. Saxicola torquatus African Stonechat
  2. Saxicola maurus Siberian Stonechat (incl variegatus, armenicus, indicus, stejnegeri, przewalskii)
  3. Saxicola rubicola European Stonechat (incl hibernans)
[IOC and OSME additionally split S stejnegeri Stejneger's Stonechat (monotypic), following Zink et al 2009.]

Last edited by Richard Klim : Friday 9th September 2011 at 10:14.
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Old Friday 9th September 2011, 09:47   #19
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Hi fellas

The TSC report will be free to view. We're just waiting for the publisher to activate the open access tag for this article.

We'll be issuing a formal statements re. the report later today.

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Old Friday 9th September 2011, 11:38   #20
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Old Friday 9th September 2011, 13:30   #21
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The full PDF of the BOURC TSC's 7th report should now be available free to view at -
http://onlinelibrary.wiley.com/doi/1...11.01155.x/pdf

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Old Friday 9th September 2011, 13:42   #22
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Martin Garner's blog: New Species on the British List.
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Old Friday 9th September 2011, 13:49   #23
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Quote:
Originally Posted by upton-till-i-die View Post
How long does it usually take for the BOU to implement the TSC's recommendations?
Look at the Bullfinch split and then realise that, unless you are really going to get some mega-milage out of your pension, it's best not to wait for a BOU decision

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Old Friday 9th September 2011, 19:09   #24
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Curious, because the paper on identity of vagrant British South Polar Skuas, basically, claims that there is hybridization, differences are subtle and British vagrants couldn't be identified neither on plumage nor DNA. Seems really stringing to call them species, then...
i don't think that's really accurate jurek,

see original discussion here

http://www.birdforum.net/showthread....ight=chilensis

the link to the british skua paper is dead now but although there's hybridisation and small amounts of genetic differences between the different southern taxa if i remember correctly it's well accepted that

great skua is genetically quite different,
chilensis is morphologically distinct, while
lonnbergi and hamiltoni are a lot bigger than either maccormacki or antarctica.


I think the only real conundrum in separating the 4 spp suggested by BOU-TSC is IDing juv/subadult type maccormacki and antarctica (adults are quite different i think?).

unfortunately the british types fell in the juv/subadult maccormacki/antarctica camp!! bad luck....

sorry if there's any inaccuracies in there - memories fade after 7 years...

cheers,
James
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Old Friday 9th September 2011, 23:36   #25
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Quote:
Originally Posted by gerrywestdean View Post
As I read it Saxicola maurus Siberian Stonechat and S rubicola European Stonechat stay together, but both are split from S torquatus African Stonechat.
So Siberian Stonechat is not yet split.
I also read it the way you did. Happy to be wrong though...

Interesting that Cabot's Tern is already on Cat A of the British list, with a (little) bit of digging i think this is due to a ringing recovery of a bird at Newhouse Wood, Herefordshire in November 1984? Anyone got any more info?

Cheers Ian.

Last edited by I Foster : Saturday 10th September 2011 at 00:34.
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