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Titre :	The changing status of the Common Crane in the UK
Auteurs :	Andrew Stanbury, Auteur
Type de document :	Article
Dans :	British Birds (104(8) AUG 2011)
Article en page(s) :	432-447
Résumé :	The Common Crane Grus grus was a familiar part of the UK avifauna up until the sixteenth century, although there is more evidence of a regular wintering population than widespread breeding. The species became extinct, probably through overexploitation, with the last evidence of breeding in England in 1542. Cranes subsequently became rare in the UK, but since the 1950s have become increasingly regular passage migrants. Two subadult Cranes, which arrived in the Norfolk Broads in autumn 1979, stayed and eventually bred there in 1981, and Cranes have bred in the Broads every year since. Population growth to 1997 was slow, mainly because of poor productivity, but since then success has improved and the number of pairs has increased steadily. Elsewhere, one pair has bred in Yorkshire since 2002, while up to three pairs have nested in the Fens of East Anglia since 2007. In 2010, there were 13-14 breeding pairs (which fledged eight young), three non-breeding pairs and a wintering population of c. 50 birds in the UK. It is unclear whether the new populations arose from emigration from the Broads or from continental Europe. The Common Crane remains a rare breeding species in the UK, but should continue to colonise new areas if present trends continue. It is not yet known whether one or more of the following factors - habitat availability, predation, human disturbance, collision risk - will constrain population growth.

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