Variación en el número de terciarias mudadas y su utilidad para el datado del Lúgano (Carduelis spinus)

• Autores: Juan Carlos Senar, José Luis Copete
• Localización: Butlletí del Grup Català d'Anellament, ISSN 1130-2070, Vol. 9, Nº. 1, 1992, págs. 7-9
• Idioma: español
• Enlaces
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• Resumen

  • It has been suggested that the presence of unmoulted tertials can be used to age Siskins. Dato on the extent of the postjuvenile moult of these tertials is, however, contradictory. Here we quantify the importonce of this moult through on analysis of tertials retained in a sample of 1.877 yearling Siskins (Euring age 3/5) trapped in 1990-1991 at a wintering area in Barcelona (NE Spain). Most of the birds (81%) had not rnoulted any tertials, 6% had moulted one, 12% two, and 1% all three. Differences between males and fernales in the extent of this moult were not quite significant (x2= 7.2 15, df= 3, p= 0.0651, males moulting slightly more tertials than females. Significant differences between those obtained in Barcelona and published results from a locality in Surrey (S England) show that the extent of the moult con vary beiween localities. If iwo tertials were moulted, these were usually tertials 2 and 3 (numbered in ascending order], and if only one was moulted, it was generally tertial 3, and less often, tertial 2. Tertial 1 was rafely moulted. These data stress the need for caution when using this character to age Siskins, and show that tertial 1 (i. E. The external, largest one) should preferably be used to age birds rather than tertial 2 (i. E. The middle one), as proposed by other outhors.