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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The occurrence of yellow-browed warbler Phylloscopus inornatus in Germany.
Auteurs :	Thorsten Kruger, Auteur ; Jochen Dierschke, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (125(1) 2004)
Article en page(s) :	41-52
Résumé :	This paper deals with the spatial and temporal pattern of occurrence of Yellow-browed Warbler in Germany. The first record goes back to 1845, when a female was trapped in late October near Berlin. Including this record, 613 Yellow-browed Warblers have been recorded until 2000. The vast majority of birds was noticed at the coast (94%, n = 577), especially on islands (91%, n = 558). Among these, the only offshore island Helgoland holds a unique position with 428 birds recorded. Observations away from the coast are rare (n = 36) and evenly spread out. The vast majority of records is from autumn (600 birds), while spring occurrences are exceptional (13 birds from 18 March to 28 May), the ratio between autumn and spring being 46 : 1. Autumn migration starts in Germany exceptionally in early September (as early as 7 September), increases throughout the month and peaks in late September/early October (median date: 5 October). Until mid October birds are seen regularly, but records are already scarce in late October, with the latest records from 14 November and 3 December. From 1845-1887 (,,era Heinrich Gatke") the species was a scarce but regular vagrant in Germany (n = 89, among these were nine birds on Helgoland in 1876-presumably the first described influx to Europe), whereas from 1888-1951 only 46 individuals were recorded in eleven years, 36 of them in the influx years 1923 and 1926 on Helgoland. Since 1952 the species is a regular vagrant in Germany, with an increase in the number of records since the 1980ies. Influx years in this period were 1967 (30 birds), 1985 (22), 1986 (33), 1988 (65), 1994 (52), 1996 (48) and 1997 (22). These years correspond well with influxes recorded in other European countries. From 1950 to 1983 a higher percentage of records was owing to bird ringing (31%), but since 1984 records coming from birdwatchers are clearly dominating (94%), demonstrating the decrease in bird ringing effort along the coast and the increase of birdwatching in Germany. The phenology and geographical distribution of records as well as the reasons for the increase of records and the biological background of vagrant Yellow-browed Warblers in Europe are discussed.

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