Print

Print


Mobirders, 

Below is an excerpt from a post to Bird Forum outlining changes in the
BOU List. I've included some that affect species seen in North America. 

 

Of special note is the BOU designation of the Canada Goose split.
Perhaps the AOU will follow them and eliminate the difficulty with
"Cackling" Goose. 

 

Enjoy--and see the full web citation below. 

 

Edge Wade 

Columbia, MO 

[log in to unmask] 

 

A Press Release from the 

BRITISH ORNITHOLOGISTS' UNION RECORDS COMMITTEE 

 

Taxonomic changes to the British List 

 

The following recommendations relating to the taxonomy of birds on the
British List will take immediate effect with the publication of the
BOURC Taxonomic Subcommittee's (BOURC TSC) report in Ibis (Ibis 147:
821-826). 

 

The items are summarised below, but the full paper or online at 

 

http://www.blackwell-synergy.com/do...9X.2005.00483.x 

 

Canada Goose Branta canadensis 

 

Now treated as two separate species: 

 

Greater Canada Goose B. canadensis (polytypic, with subspecies 

canadensis, fulva, interior, maxima, moffitti, occidentalis and
parvipes) 

 

Lesser Canada Goose B. hutchinsii (polytypic, with subspecies
hutchinsii, leucopareia, minima and taverneri) 

 

Greater Canada Goose is on Category C of the British List. 

 

A paper on Canada goose taxonomy is in preparation. 

 

Greater Scaup Aythya marila 

 

Treat as polytypic (previously monotypic), with subspecies A. m. marila
and A. m. nearctica. The subspecies that occurs in Britain is A. m.
marila. 

 

Common Scoter Melanitta nigra 

 

Treat as two separate species: 

 

Common Scoter M. nigra (monotypic) 

 

Black Scoter M. americana (monotypic). 

 

Both species are on Category A of the British List. 

 

Velvet Scoter Melanitta fusca 

 

Treat as two separate species: 

 

Velvet Scoter M. fusca (monotypic) 

 

White-winged Scoter M. deglandi (polytypic, with subspecies deglandi 

and stejnegeri). 

 

Velvet Scoter is on Category A of the British List. 

 

Red-throated Diver Gavia stellata 

 

Treat as monotypic. 

 

Herring Gull Larus argentatus 

 

The combined evidence of morphology, vocalisations and molecular
phylogenetics strongly indicates that L. a. michahellis (incl.
atlantis), L. a. armenicus and L. a. argentatus (incl. argenteus) are
best treated as separate species: 

 

Yellow-legged Gull L. michahellis (polytypic) 

 

Armenian Gull L. armenicus (monotypic) 

 

Herring Gull L. argentatus (polytypic) 

 

Herring Gull and Yellow-legged Gull are on Category A of the British
List. 

 

The taxonomic status of L. a. smithsonianus and L. a. cachinnans is
still under review. Diagnosability and differentiation of taxa such as
these are central to taxonomic decisions, and the BOU recognises the
important contribution that field birders can make in developing
identification criteria. However, decisions cannot be based solely on
knowledge gained from extralimital records of birds of unknown origin,
such as most of the British occurring Caspian Gulls. TSC has purposely
taken its time over this issue, as it was known that research was still
underway, and it was essential to be in full possession of the facts
before attempting to resolve the 'large white-headed gull' situation. A
paper is in preparation that will describe the reasoning behind the
current splits, and the problems that still need to be resolved. 

 

A useful summary of the taxonomic literature on the Larus argentatus -
fuscus complex up to 2001 was published by Dubois (2002. Dutch Birding
24: 271-298). 

 

Citation: Sangster, G., Collinson, J.M., Helbig, A.J, Knox, A.G. &
Parkin, D.T. 

2005. Taxonomic recommendations for British Birds: third report. Ibis
147: 

821-826.

 


__________________________________________________
###########################################################
*              Audubon Society of Missouri's              *
*                Wild Bird Discussion Forum               *
*---------------------------------------------------------*
* To subscribe or unsubscribe, click here:                *
* https://po.missouri.edu/cgi-bin/wa?SUBED1=mobirds-l&A=1 *
*---------------------------------------------------------*
* To access the list archives, click here:                *
* http://po.missouri.edu/archives/mobirds-l.html          *
*                                                         *
* To access the Audubon Society of Missouri Web           *
* Site:  http://mobirds.org                               *
###########################################################