The timing, pattern, and extent of the first prebasic wing molt of White-winged Crossbills (Loxia leucoptera) were determined during a 6-yr banding study in interior Alaska. Hatching-year birds were not caught in substantial numbers until May, and all crossbills molted from juvenal to first basic plumage between September and December. A subsample consisting of 65 males and 55 females in first basic plumage was used to determine the pattern and extent of wing covert molt. On average, birds molted three greater coverts (GC) and retained two juvenal medial coverts (MC) per wing. The number of molted GCs was negatively correlated with that of juvenal MCs. Twenty-three percent of the individuals molted no GC, and no crossbill replaced all these feathers. The pattern and extent of covert molt was similar in males and females and was symmetrical in 69% of the individuals, but differed by one or two feathers in the remaining birds. Males in first basic plumage and with partially red or pink contour feathers molted more GCs and retained fewer MCs than males without contour feathers of these colors, although both groups apparently were of the same age. Remex molt was found in only one bird, which also showed partial proximal secondaries (=tertial) replacement. /// Se determinó el tiempo, el patrón y la extensión de la primera muda prebásica de Loxia leucoptera durante un estudio de seis años en el interior de Alaska. No se atraparon aves de primer año de forma sustancial hasta mayo, y todas las aves mudaron del plumaje juvenil al primer plumaje básico entre septiembre y diciembre. Una submuestra de 65 machos y 55 hembras en primer plumaje básico se usó para determinar el patrón y extención de la muda de cubiertas del ala. En general, las aves mudaron tres cubiertas mayores (GC) y retuvieron dos cubiertas juveniles medias (MC) por ala. El número de GCs mudadas se correlacionó negativamente con las de MC juveniles. Veintitres prociento de los individuos no mudó GCs, y ningún ave reemplazó todas estas plumas. El patrón y la extensión de la muda de cubiertas fué similar en machos y hembras y fué simétrica en 69% de las aves, pero difirió por una o dos plumas en el resto de la muestra. Los machos en el primer plumaje básico y con plumas de contorno rosadas o parcialmente rojas mudaron más GCs y retuvieron menos MCs que machos sin plumas de contorno de estos colores, aunque ambos grupos aparentemente eran de la misma edad. Muda de remeras se halló en solo un ave, que también mostró reemplazamiento terciario parcial.
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