La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Ferruginous Ducks Aythya nyroca at "Ismaninger Speichersee and Fischteiche": Counts of moulting birds for the years 2003 to 2007 and suspected breeding in 2007.
Auteurs :	Peter Koehler, Auteur ; Ursula Koehler, Auteur ; Eberhard von Krosigk, Auteur ; Burkhard Hense, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (46(2-3) DEC 2007)
Article en page(s) :	129-133
Résumé :	For more than fifty years, Ferruginous Ducks have migrated to this Ramsar site near Munich, Upper Bavaria, Germany, to moult flight-feathers between July and September. From 2003 to 2007, counts averaged twelve (six to twenty five) moulting birds, including nine (five to nineteen) males and three (one to six) females. The maximum record, with twenty five birds moulting in the last year of study, 2007, differs significantly from the fairly constant, if fluctuating, numbers in the last three decades. The proportion of males continued to increase slightly.After two successful broods in each of 1932 and in 1933, it was not until 2007 that a pair was suspected to breed in one of the former fish ponds. Young birds, however, were not observed. "Ismaninger Speichersee and Fischteiche" remains a key site for the species in Central Europe.

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