Schweizer, M. & M. Güntert
(* = Kurzbeitrag)
Die erste dokumentierte Feststellung einer Raubmöwe Stercorarius sp. in der Schweiz.
(von 1994 bis 2006 vergeben)
Seltenheitsnachweis, Artbestimmung, Geschichte, Biographie, Daniel Sprüngli
Stercorarius pomarinus, Stercorarius parasiticus, Stercorarius longicaudus
Spatelraubmöwe, Schmarotzerraubmöwe, Falkenraubmöwe
Schweiz, Bern, Thunersee
The earliest documented record of a jaeger Stercorarius sp. in Switzerland. A jaeger specimen in the collection of the Natural History Museum Bern (NMBE), shot on Lake Thun (canton of Berne) at the end of September 1797, has been re-examined because of a discrepancy between plumage colour and the length of its central tail feathers. The mounted bird was registered as Long-tailed Jaeger Stercorarius longicaudus and is mentioned under this name and as an adult in several faunistic publications. A close examination revealed that the bird actually is a Parasitic Jaeger S. parasiticus in its 3rd calendar year, and that an additional pair of central tail feathers taken from a Long-tailed Jaeger was glued onto the true tail. A search in the archives revealed that the mount was formerly in the collection of Reverend Daniel Sprüngli (1721–1801) and is described in detail in his manuscript «Ornithologia Helvetica».
Four other jaegers collected around 1800 are listed in the old NMBE catalogues, but none of these specimens exists today. Among them was a Long-tailed Jaeger in full nuptial plumage, removed from the collection and discarded after 1830. This individual was possibly the donor of the glued-on tail feathers.
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