La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Results of recoveries of Mallards ringed in winter at Nuremberg
Auteurs :	Manfred Kraus, Auteur ; Wener Krauss, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (37(2) May, 1998)
Article en page(s) :	121-140
Résumé :	There were 358 records (12%) of 3079 Mallards ringed in the winter months between 1 Jan 82 and 30 Dez 89.82% of the records occurred by hunting, overproportionately more males than females were shot. The mortality averaged 45%, the life expectation 1 year and 8 months. The winter captures of the Mallards in the first year amount to 76%, of which 56% are males. In 2 cases the captures suggest a pair during 2 breeding seasons, in one case during one breeding season and in a further case during 3 breeding seasons. The winter guests return to breeding grounds more than 2000 km towards northwest, the majority, however, only moves up to 100 km from the winter quarters to their breeding site. During winter a change of winter habitat is unlikely, whereas a change in the following winters is more often the case. It was proven by own captures that Mallards stick to the same winter habitat during 4 successive winters. The area of autumn migration predominantly corresponds with the breeding grounds. It covers a broad area of over 2000 km towards NE, whereas the local population spreads approximately 200 km in all directions.

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