Sex and age identification of palila

摘要: -Methods to sex and age Palila (Loxioides bailleui), an endangered Hawaiian finch restricted subalpine woodlands on Hawai'i, were identified the basis of measurements plumage characteristics 17 museum specimens 96 known-age, live Palila. undergo a single annual molt during September-December following breeding season. Presence complete or partial wingbar distinguishes hatch-year second-year from after-second-year birds. Adult male are distinguished females by distinct napeline <30% gray feathers intermixed with yellow head. The black lores chin males darker than those back, whereas lighter same shade as back feathers. IDENTIFICACION DE LA EDAD Y EL SEXO EN LOXIOIDES BAILLEUI Sinopsis.-Se desarroll6 un mhtodo para identificar la edad y el sexo de individuos cual es una especie en peligro extinci6n. Esto se hizo utilizando medidas caracteristicas del plumaje especimenes museo El ave muda vez al anio entre septiembre-diciembre, luego que pasa epoca reproducci6n. La presencia parcial o total barra ala diferencia los primer segundo otros mayor edad. Los machos adultos diferencian las hembras por linea peculiar nuca tener 30% menor plumas con color entremezclado gris amarillo cabeza. negro barbilla mas oscuro, misma coloraci6n espalda, mientras son claros tonalidad espalda. bailleui) is (Fringillidae: Subfamily Drepanidinae) native forests above 2000 m Mauna Kea, Island Hawai'i. It was formerly more widespread Hawai'i (Perkins 1903) in archipelago (Olson James 1982, Scott et al. 1986); estimated population size 1371 1992, has not exceeded 6500 birds past 13 yr (U.S. Fish Wildlife Service, unpubl. data). Immature seeds mamane tree (Sophora chrysophylla) staple food Palila, which also use extensively for nesting shelter. Browsing feral ungulates thought have been major cause decline (Scott 1984). U.S. Service (FWS) conducted surveys mid-1970s 1984), and, 1987, began intensive studies factors limiting growth. An impor' Current address: Hakalau Forest National Refuge, 154 Waianuenue St., Room 219, Hilo, 96720 USA.