Bird ringing in Britain and Ireland in 2009

摘要: This is the 73rd annual report of British Trust for Ornithology's Ringing Scheme, covering data received and work carried out in 2009. Much research during year looked at ways to improve analysis ringing understand population change. included producing survival rates from Constant Effort Sites (CES) scheme first time further developing methods analysing our demographic sets an integrated manner. Research was also undertaken on biometric investigate how individual condition responds long‐term environmental CES suggested that low productivity 2007 2008, combined with one coldest winters since 1995/96 residents, contributed reduced adult numbers 2009 many species. There were significant decreases Wren Troglodytes troglodytes, Sedge Warbler Acrocephalus schoenobaenus, Reed A. scirpaceus, Blackcap Sylvia atricapilla, Lesser Whitethroat S. curruca, Willow Phyllo...