La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Sex and age related biometrical patterns in Pyrenean citril finches (Serinus citrinella)
Auteurs :	A. Borras, Auteur ; J. Cabrera, Auteur ; T. Cabrera, Auteur ; J. C. Senar, Auteur
Type de document :	Article
Dans :	Vogelwarte (39(3) Feb., 1998)
Article en page(s) :	196-202
Langues:	Allemand
Résumé :	Sex and age variation in external biometric measurements is described for the eastern Pyrenean Citril Finch population (n = 376 birds from 16 localities). Citril Finch overall biometry could be summarized by five Principal Components (PCA), which explain 60% of total variation. The PC1 was related to overall feather size of the birds (wing, third primary and tail lengths). Adult males were the larger birds and yearling females the smaller ones. PC2 was related to the shape of the bill (mainly width and depth), but no sex or age differences appeared in relation to this component. The three next overall principal components (PC3-5) were related to wing shape, based on PCA on the relative lengths of the primary feathers (P2-P8) corrected for body size and allometry. These three components varied according to sex and age in a complex way. Pyrenean Citril finches showed larger wing lengths than central European populations, which suggests that although a clinal variation in size from north to south should be expected. other factors as habitat quality or diet may also he of great importance in determining the size of Citril Finches.

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