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Nicolas Strebel

Überwinternde Wasservögel in der Schweiz – Ergebnisse der Wasservogelzählungen seit 1967.

2021

118

344–360

Key words
(von 1994 bis 2006 vergeben)

Wasservogelzählung, Bestandsgrösse, Bestandsentwicklung, Bestendstrend, Phänologie, Flyway, Seen, Flüsse, Flussstaus, Kleingewässer, Nahrung

Schlagwort_Vogelart
(wissenschaftlich)

Anas acuta, Spatula clypeata, Anas crecca, Mareca penelope, Anas platyrhynchos, Mareca strepera, Anser anser, Ardea cinerea, Aythya ferina, Aythya fuligula, Bucephala clangula, Cygnus cygnus, Cygnus olor, Fulica atra, Larus canus, Larus ridibundus, Melanitta fusca, Mergus merganser, Netta rufina, Phalacrocorax carbo, Podiceps cristatus, Podiceps nigricollis, Somateria mollissima, Tachybaptus ruficollis

Schlagwort_Vogelart
(deutsch)

Spiessente, Löffelente, Krickente, Pfeifente, Stockente, Schnatterente, Graugans, Graureiher, Tafelente, Reiherente, Schellente, Singschwan, Höckerschwan, Blässhuhn, Sturmmöwe, Lachmöwe, Samtente, Gänsesäger, Kolbenente, Kormoran, Haubentaucher, Schwarzhalstaucher, Eiderente, Zwergtaucher

Bodensee, Neuenburgersee, Genfersee, Zürichsee, Vierwaldstättersee, Schweiz

deutsch

Abhandlung

Wintering waterbirds in Switzerland – results of the waterbird censuses since 1967. – Every year, around half a million waterbirds spend the winter on Swiss lakes and rivers. Since 1967, their populations have been recorded as part of the international waterbird census. This database gives us a detailed picture of the distribution and population trends of the various winter visitors in Switzerland and allows comparisons with the large-scale trends of these species. The most important water bodies, Lake Constance (including foreign parts), Lake Neuchâtel and Lake Geneva (including foreign parts), together host about 70 % of all wintering waterbirds in Switzerland. The development of the January total population can be divided into three phases: A steep increase between the start of counting in 1967 and the early 1980s, a phase with fluctuating but high numbers in the 1980s and 1990s, followed by a gradual decline since then. The increase at the beginning coincides with colonization of the waters by the zebra mussel Dreissena polymorpha. Furthermore, a recovery after the extremely cold winter 1962/63, and also a general recovery of the unsustainably used waterbird populations may have contributed to the development. The declining populations since the 1990s can be explained by the shift of the wintering grounds of some common species closer to their northern or eastern European breeding grounds, made possible by climate change. Climate change also impacts the distribution of waterbirds in Switzerland. Lake Geneva, to which many waterfowl used to migrate during severe cold, has seen disproportionately strong population declines in recent years. Apart from the species that shift their wintering area towards the northeast, many species show a positive population trend. For most of these, the international population trend is also positive, and they may have benefited from improved protection of species and areas throughout Europe. A major challenge for the future is to protect wintering waterbirds from disturbance due to the year-round increase in recreational activities on our lakes. If this fails, many waterbird species will no longer be able to exploit the potential of the Swiss lakes as wintering grounds. Attachment as Excel sheet / Anhang als Excel-Datei