Thoma, M. & S. Althaus
(* = Kurzbeitrag)
Erstnachweis des Grünlaubsängers Phylloscopus trochiloides in der Schweiz und sein Status in Europa.
(von 1994 bis 2006 vergeben)
Seltenheitsbeobachtung, Beringung, Unterartbestimmung, Flügellänge, Handschwingen, Brutgebiet, Brutnachweis, Phänologie, Heimzug, Wegzug
Phylloscopus trochiloides viridanus, Phylloscopus collybita, Phylloscopus inornatus, Phylloscopus trochiloides plumbeitarsus, Phylloscopus nitidus, Phylloscopus borealis, Phylloscopus trochilus
Grünlaubsänger, Zilpzalp, Gelbbrauenlaubsänger, Middendorff-Laubsänger, Wacholderlaubsänger, Wanderlaubsänger, Fitis
Schweiz, Wallis, Col de Bretolet
First record of Greenish Warbler Phylloscopus trochiloides in Switzerland and its status in Europe. On 11 October 2010 a first-year Greenish Warbler Phylloscopus trochiloides was captured on the Col de Bretolet (Valais, 1920 m a.s.l., 46° 8’ 34” N/ 6° 47’ 45” E), constituting the first record of the species for Switzerland. We discuss its identification, especially with respect to other Phylloscopus taxa showing one or two wingbars, a striking supercilium, plain tertails, and that are likely to display extralimital occurrence in Europe, i.e. «Two-barred Greenish» P. t. plumbeitarsus, Green P. nitidus and Arctic Warbler P. borealis.
Further, we present a review of the status of Greenish Warbler in Europe until 2010 – focusing on records outside those countries harbouring established breeding populations. Greenish Warbler, having greatly expanded its breeding range westwards during the 19th and 20th century, is currently a regular breeding bird in Russia, Ukraine, Belarus, Lithuania, Latvia, Estonia, Finland, Sweden, Poland and Slovakia and has occurred as an irregular breeder, migrant and/or vagrant in 14 more countries (Ireland, Great Britain, France, Belgium, the Netherlands, Norway, Denmark, Germany, Switzerland, Austria, Czech Republic, Romania, Malta, Spain). The species appears to be expanding its range westwards where the number of records increase overall. Outside its breeding range, the median of spring migration is simultaneously reached during the first ten days of June. The median of autumn migration is mostly reached in the last ten days of August. There appears to be a tendency of the median to increasingly shift towards September the further west a country lies. The occurrence pattern in spring outside the regular breeding range appears to result from «over- shooting». It is generally assumed that high spring temperatures combined with southeasterly winds are especially favourable for Greenish Warblers to prolong their migration. The majority of spring and summer records outside the regular breeding range concern singing males. Observations during spring and early summer are concentrated in coastal areas and low mountain ranges. During autumn migration, observations concentrate along the coasts of the North and Baltic Seas, probably reflecting (at least partly) observer coverage. However, single records are scattered across Europe. Several mechanisms, such as long range dispersal, reverse migration and/or evolution of new migration pathways and wintering areas may lead to the observed pattern in autumn occurrence, and are briefly discussed.
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