en el páramo del Antisana, Ecuador, a 3800 -4 000 msnm. De 8 territorios bajo control, 6 (75%) lo constituyeron grupos poliandricos. La nidificación se inicia en casi todos los meses del año, pero el 74% aconteció en los primeros seis meses del año. El intervalo entre nidificaciones consecutivas de las mismas parejas o grupos poliandricos fue de 6 -11 meses. La presa principal de la dieta de los pichones fueron conejos, Sylvilagus brasiliensis. La mayoría de las presas para los pichones la aportaron los machos. Los grupos poliandricos se mantuvieron estables durante los cuatro años de estudio, salvo en un territorio en el que se detectaron 3 hembras diferentes en 14 años. Los machos contribuyeron en la construcción del nido, incubación, vigilancia y en aportar presas al nido. En los grupos poliandricos un único macho copuló con la hembra, los otros machos del grupo actuaron como meros "ayudantes". De 15 adultos, en cinco territorios, cuatro (26.7%, 3 machos, 1 hembra) fueron de la fase clara y 11 (73.3%, 4 hembras, 7 machos) de la fase oscura. Detalles de cuatro sonidos (llamadas) son presentados. Los machos ayudantes presentan plumaje subterminal con la parte dorsal rojizo quizás por su condición de subordinados al macho alpha. PALABRAS CLAVES: Antisana, biología reproductiva, Geranoaetus poecilochrous, páramo, poliandria ABSTRACT.-The breeding and feeding of the Gurney's Hawk Geranoaetus poecilochrous was studied from 1991-1994 and with further detail from 2007-2012 in the paramo of Antisana, Ecuador, at 3800 -4400 m altitude. Of a total of 8 territories at Antisana, 6 (75%) were polyandrous groups and 2 monogamous pairs. Breeding occurred in most months of the year, but 74% of the 27 clutches registered were found in the first six months of the year. Breeding periods of the same pairs or groups had intervals of 6-11 months. The main prey was rabbits (Sylvilagus brasiliensis). Males brought most food to the young. Polyandrous groups remained stable over the four years of study but in one territory there were three different females over a period of 14 years. Males contributed in nest building, incubation and bringing prey to the young. Only one male was observed copulating with a female, the other males in the group were "helpers at the nest". Of the 15 adults, in five territories, four (26.7%, 3 males, 1 female) were white bellied (light morph), and 11 (73.3%, 4 females, 7 males) were dark-bellied birds (dark morph). Details of four different calls are presented.
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