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Titre :	An atlas of bird ringing at the island of Helgoland. Part 4: Trapping numbers in the trapping garden from 1960 to 2004 (2007)
Auteurs :	Kathrin Hueppop, Auteur ; Ommo Hueppop, Auteur
Type de document :	Article
Dans :	Vogelwarte (45(3) AUG 2007)
Article en page(s) :	145-207
Langues:	Allemand
Résumé :	With both a high level of standardisation of trapping methods, and it's remote location in the North Sea, the trapping garden on the small island Helgoland is especially well suited to investigate bird migration. Here, detailed evaluations and graphic presentations of the annual trapping totals covering more than four decades (1960 to 2004) are given for 71 species with in total roughly 501,000 birds ringed, for the whole year and for spring migration and autumn migration separately. The individual trapping dates of 67 "rare" species with less than 25 trappings in this period (n = 340) are compiled in an appendix. From 1970 to 2004, 43.3% of all birds were trapped during spring migration, 56.3% during the autumn migration and only 0.4% between the (species-specific) migration times. The Song Thrush Turdus philomelos and Blackbird Turdus merula were the most frequent species constituting 23% and 22%, respectively, of the total, followed by Garden Warbler Sylvia borin, Robin Erithacus rubecula and Chaffinch Fringilla coelebs with more than 5% each. Nine species made up 1 to 5%, and 21 species 0.1 to 1%. The majority (36 species) made up less than 0.1%, as did each of the "rare" species. 72% of all birds caught were short/medium distance migrants, and 22% long distance migrants. The vast majority of birds were forest birds (96%). The proportions of males and females differed significantly in seven of eight species during spring migration and in six of ten species during autumn migration with the females nearly always outweighing the males. The percentages of adults and juveniles differed significantly during spring migration in seven of eight species and during autumn migration in all of 16 species. Juveniles were nearly always more numerous than adults, particularly during autumn migration. From 1970 to 2004, the percentage of juveniles during autumn migration increased in 12 of 16 species (significantly so in eight species).

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