| Titre : | Flight feather moult of waterfowl at Lake Constance (the Bodensee) |
| Auteurs : | Siegfried Schuster, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (47(1) AUG 2008) |
| Article en page(s) : | 3-22 |
| Résumé : | This paper describes the moulting sites, timing and numbers of the 17 waterbird species regularly moulting their flight feathers at Lake Constance. The data presented include 90 observations of Black-throated Divers in flight feather moult (flightlessness), 60 of them in February. Numbers of moulting Great-crested Grebes at the lake have quadrupled during the last 30 years, with up to 2500 birds moulting at a shallow-water site near Friedrichshafen which had become a nature reserve in 1983. Increases in moulting populations were also observed in Mute Swan, Greylag Goose, Ruddy Shelduck and almost all duck species. Predation pressure by Yellow-legged Gulls, Oil the other hand, has led to declines in the moulting populations of the smallest waterbird species, Little Grebe and Black-necked Grebe.The Goosander moulting site at the Rhine delta in Vorarlberg (Austria) is visited by up to 500 birds, almost exclusively females. The most common waterbird moulting its flight feathers at Lake Constance is the Coot with a population of some 20,000 individuals, The different moulting strategies employed by the various species are discussed as well as the species' strategies to minimise (predation) risks and distrurbance during the 3 to 7 weeks of total flightlessness. Moulting times are changing markedly at present, in the face of climate change, and some species are moving their moulting sites much further north. These changes have immediate relevance for conservation management of important moulting sites. |
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