La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[Females preserving juvenility: Sex specific development of feather characteristics in the Shelduck (Tadorna tadorna).] (2001)
Auteurs :	Simone Verbarg, Auteur ; Hans-Heiner Bergmann, Auteur ; Wiltraud Englaender, Auteur
Type de document :	Article
Dans :	Vogelwarte (41(2) 2001)
Article en page(s) :	143-149
Langues:	Allemand
Résumé :	White fringes of 6th, 10th and 12th secondary flight feathers of shelducks were scanned and their proportions of the vane areas measured using ArcView GIS software. First year birds had broad conspicuous fringes on both all secondaries and primaries 1-5. Older birds had only narrow fringes on secondaries or none. No differences between two years old birds and older ones were determined. However, throughout their lives, females, as a rule, had broader fringes on secondaries than males. A marbled pattern was seen on the tips of the two innermost primaries only in females. Moreover, in some individual birds, fringes showed constant individual features for several years.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...