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Schweizer, M.

Das Auftreten der verschiedenen Unterarten der Schafstelze Motacilla flava in der Schweiz und ihre Handhabung durch die Schweizerische Avifaunistische Kommission (SAK).

2013

110

33–40

Key words
(von 1994 bis 2006 vergeben)

Bestimmung, Hybridisation, Vermischung, Mischformen

Schlagwort_Vogelart
(wissenschaftlich)

Motacilla flava, Motacilla flava thunbergi, Motacilla flava cinereocapilla, Motacilla flava feldegg, Motacilla flava flavissima, Motacilla flava lutea, Motacilla flava iberiae

Schlagwort_Vogelart
(deutsch)

Schafstelze

Schweiz

deutsch

Abhandlung

The status of the different subspecies of Yellow Wagtail Motacilla flava in Switzerland and their treatment by the Swiss Rarities Committee. – 13 subspecies are usually accepted in the Yellow Wagtail which chiefly differ in their head pattern. Most subspecies have parapatric breeding areas and hybridise in contact zones. Two subspecies breed locally in Switzerland: the nominate subspecies dominates north of the Alps, while cinereocapilla breeds mainly in the Rhone valley (cantons of Valais and Vaud) as well as in the canton of Ticino. These two subspecies, however, admix at least in the region of the Seeland (cantons of Berne and Fribourg) and in the canton of Geneva. Additionally, thunbergi is a regular passage migrant in the whole country. In contrast, the subspecies feldegg and flavissima/lutea occur only irregularly and their records have to be submitted to the Swiss Rarities Committee (SRC). Intermediate birds between feldegg and other subspecies have been recorded several times. They have been treated under feldegg as long as they could be distinguished from locally breeding intermediate forms. According to current knowledge, flavissima and lutea cannot be separated with certitude. Hence, the SRC treats them together although the northwest European subspecies flavissima is more likely to occur than the chiefly central Asian subspecies lutea. Several observations of the southwest European and northwest African subspecies iberiae have been reported during the last years. Iberiae can probably not be safely distinguished from certain locally breeding intermediate birds between flava and cinereocapilla. As a consequence, the SRC does no longer treat records of the subspecies iberiae. Nevertheless, well documented observations of birds with phenotypic features of this subspecies are still archived.