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Nyt fra BOURC - kategori C listen

Artiklen er tilføjet af MBH torsdag 13. oktober 2005 kl. 08.03. Læst 1983 gange
Nyt fra BOURC

12 October 2005

A Press Release from the BRITISH ORNITHOLOGISTS' UNION RECORDS COMMITTEE

Changes to Category C of the British List

With the publication of the Committee's review of Category C (Ibis 147: 803-820) the following changes to the British List take immediate effect:

Mute Swan (Cygnus olor) Categories AC change to AC2

Black Swan (Cygnus atratus) Category E* - no change

Greylag Goose (Anser anser) Categories ACE* change to AC2C4E*

Snow Goose (Anser caerulescens) Categories AE* change to AC2E*

Greater Canada Goose (Branta Canadensis) Categories ACE* change to C2E*

Barnacle Goose (Branta leucopsis) Categories AE* change to AC2E*

Egyptian Goose (Alopochen aegyptiacus) Categories CE* change to C1E*

Ruddy Shelduck (Tadorna ferruginea) Categories BDE* - no change

Muscovy Duck (Cairina moschata) Category E* - alert JNCC

Wood Duck (Aix sponsa) Category E* - no change

Mandarin Duck (Aix galericulata) Categories CE* change to C1E*

Gadwall (Anas strepera) Category A change to AC2

Mallard (Anas platyrhynchos) Categories AE* change to AC2C4E*

Red-crested Pochard (Netta rufina) Categories AE* change to AC2E*

Ruddy Duck (Oxyura jamaicensis) Categories CE* change to C1E*

Black Grouse (Tetrao tetrix) Categories AE - no change

Western Capercaillie (Tetrao urogallus) Categories BC change BC3

Red-legged Partridge (Alectoris rufa) Categories CE* change to C1E*

Grey Partridge (Perdix perdix) Categories ACE change to AC2E

Common Pheasant (Phasianus colchicus) Categories CE* change to C1E*

Golden Pheasant (Chrysolophus pictus) Categories CE* change to C1E*

Lady Amherst's Pheasant (Chrysolophus amherstiae) Categories CE* change to
C6E*

Black-crowned Night Heron (Nycticorax nycticorax) Categories AE* - no change

Sacred Ibis (Threskiornis aethiopicus) Category E - no change

Red Kite (Milvus milvus) Categories AC change to AC3

White-tailed Eagle (Haliaeetus albicilla) Categories ACE change to AC3E

Northern Goshawk (Accipiter gentilis) Categories AE* change to AC3E*

Rock/Feral Pigeon (Columbia livia) Categories AE* change to AC4E*

Rose-ringed Parakeet (Psittacula krameri) Categories CE* change to C1E*

Barn Owl (Tyto alba) Categories AE* - no change

Little Owl (Athene noctua) Category C change to C1



NOTE - the creation of Category C6 (ref. Lady Amherst's Pheasant - see full paper).

The full paper can be viewed as free content on the BOU's Ibis website

Citation: Dudley, S.P. 2005. Changes to Category C of the British List. Ibis
147: 803-820.

Kommentarer:

Morten Bentzon Hansen skriver torsdag 13. oktober 2005 kl. 08.09

C
Species that, although introduced, now derive from the resulting self-sustaining populations.

C1
Naturalized introduced species species that have occurred only as a result of introduction, e.g. Egyptian Goose Alopochen aegyptiacus.

C2
Naturalized established species species with established populations resulting from introduction by Man, but which also occur in an apparently natural state, e.g. Greylag Goose Anser anser.

C3 Naturalized re-established species species with populations successfully re-established by Man in areas of former occurrence, e.g. Red Kite Milvus milvus.

C4
Naturalized feral species domesticated species with populations established in the wild, e.g. Rock Pigeon (Dove)/Feral Pigeon Columba livia.

C5
Vagrant naturalized species species from established naturalized populations abroad, e.g. possibly some Ruddy Shelducks Tadorna ferruginea occurring in Britain. There are currently no species in category C5.

C6
Former naturalized species species formerly placed in C1 whose naturalized population is either no longer self-sustaining or are considered extinct, e.g. Lady Amherst's Pheasant Chrysolophus amherstiae.




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