Aves, p�le ornithologique de Natagora

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Aves, 33/2 | 1996 | 77-84

  Monitoring of scaup ducks (Aythya marila) in the Basse-Meuse Liégeoise during the winter 1994/1995.
Testaert, D.

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Close monitoring of the scaup ducks throughout one winter period with, for each observation session, a precise description of each individual, based in particular on the state of its moult, revealed a degree of individual replacement which was undetectable on the basis of head-counts alone. At least 33 different birds were observed, whereas the maximum figure recorded was 22. From these observations it was also possible to determine the end of the moulting period : around mid-February for the young males, mid-March for the young females.