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Autor(en)
Manuel Schweizer
Titel
Die Bestimmung von adulten Mittelmeermöwen Larus michahellis, Steppenmöwen L. cachinnans und Silbermöwen L. argentatus in der Schweiz.
Jahr
2020
Band
117
Seiten
338–346
Key words
(von 1994 bis 2006 vergeben)
(von 1994 bis 2006 vergeben)
Schlagwort_Inhalt
Bestimmung, Variabilität, Hybriden, Kopfzeichung, Halszeichnung, Unbefiederte Körperteile, Gestalt, Struktur, Handschwingenzeichnung
Schlagwort_Vogelart
(wissenschaftlich)
(wissenschaftlich)
Larus michahellis, Larus cachinnans, Larus argentatus
Schlagwort_Vogelart
(deutsch)
(deutsch)
Mittelmeermöwe, Steppenmöwe, Silbermöwen
Schlagwort_Geogr.
Schweiz
Sprache
deutsch
Artikeltyp
Abhandlung
Abstract
Identification adult of Yellow-legged Gulls Larus michahellis, Caspian Gulls L. cachinnans and Herring Gulls L. argentatus in Switzerland. The identification of large gulls is a constant source of headaches for ornithologists and often represents a great challenge. Their plumage development lasts over several years and the different species show great individual variation in all age groups, which makes their separation even more difficult. This article treats the identification of adult Yellow-legged Larus michahellis, Herring L. argentatus and Caspian Gulls L. cachinnans. Experience with the plumage characteristics, structure and variability of our most common species, the Yellow-legged Gull, is a prerequisite for the reliable identification of the other two species. Structural features are important for the identification of the Caspian Gull, but also help to recognize a Herring Gull. Patterns of primaries provide important criteria to distinguish Yellow-legged from Caspian and Herring Gulls. However, the last two species show overlap in these features, but can usually be separated among others by structural differences. Not all adult individuals of the three species can always be safely identified. In particular Herring and Caspian Gulls hybridize with each other. Hybrids from mixed colonies often show intermediate features between the two parental species. Of course, they can also occur in Switzerland and in individuals that do not fit into a scheme, a hybrid origin should always be considered.
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