Population size and breeding success of Icelandic Whooper Swans Cygnus cygnus: results of the 2010 international census

摘要: The fifth international census of Whooper Swans in Britain, Ireland and Iceland was undertaken January 2005 to determine the size winter distribution Icelandic-breeding Swan population. A total 26,366 counted, which 37% were recorded Republic (9,748 birds), 25% England (6,480), 16% Northern (4,331), Scotland (4,142), 6% (1,556) < 1% Wales Isle Man (109). comparison with results previous made 2000 found that numbers swans counted had increased all countries except Wales. There also an increase proportion wintering Scotland, compared elsewhere range. substantial birds not accompanied by a significant number flocks recorded, remains concentrated at relatively few sites. In contrast, there decrease Scotland. As censuses, most commonly on pasture Britain Ireland, although use arable land has over last three censuses from 7% 27%. highest date. This represents 26.4% census, 66.4% population decade.