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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Moult assemblies of Little Grebes Tachybaptus ruficollis in Denmark.]
Auteurs :	Keld Henriksen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (95(4) 2001)
Article en page(s) :	145-148
Langues:	Anglais
Résumé :	Little Grebes shed their flight feathers simultanously and individuals are flightless for three to four weeks, mainly during August-September (Cramp and Simmons 1977). Many of these birds assemble to moult at certain, often traditional sites (Vlug 1996). In this paper, I examine the distribution and size of these assemblies in Denmark, and the wetlands used. The study is based mainly on observations collected by the Local Report Committees of the Danish Ornithological Society. Assemblies were recorded on 52 sites during August-September and on 47 sites during October. Numbers increased on some well-known wintering sites during October, most likely due to an influx of birds which had moulted their flight feathers elsewhere. Adding the maximum number of grebes from all sites gave totals of 2223 birds in August-September and 2191 in October. The two most important sites in August-September, with 171 and 150 birds respectively, were at newly established lakes. In October, however, all assemblies of more than 100 birds were at coastal sites. Of all grebes recorded during August-September, 58% assembled at lagoons or newly established lakes, waters especially rich in suitable foods. The breeding population of Little Grebe in Denmark is estimated at 1500-2000 pairs (Grell 1998). Many pairs (maybe 1100; Nielsen 1995) are found in small shallow waters and it is suggested that it is mainly these grebes that undertake post-breeding movements to suitable moulting sites.

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