Confirmation of cooperative polyandry in the Galapagos hawk ( Buteo galapagoensis )

Faaborg, John; Parker, Patricia G.; DeLay, Linda S.; Vries, Tjitte de; Bednarz, James C.; Paz, S. Maria; Naranjo, J.; Waite, Thomas A.

doi:10.1007/s002650050127

Cited by 34 publications

(39 citation statements)

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“…Comparison of social groups in Gurney's and Galapagos Hawks.-Since Brosset (1963) drew attention to the presence of three hawks at a nest-site of the Galapagos Hawk (Buteo galapagoensis) polyandry in this species has been studied in further detail (DeLay et al 1996;Faaborg et al 1995;Faaborg and Patterson1980;de Vries, 1976de Vries, , 1975de Vries, , 1973. Faaborg and Bednarz 1990 describe the breeding behavior of two species, the Galapagos Hawk and the Harris Hawk (Parabuteo unicinctus), comparing the ecological factors affecting the development of group breeding, and they concluded that their social systems are widely divergent in composition, stability and function.…”

Section: Resultsmentioning

confidence: 99%

Breeding and feeding biology of the Gurney’s Hawk Geranoaetus poecilochrous in the paramo of Antisana, Ecuador

Vries¹,

Cabot²,

Coello³

et al. 2017

REMCB

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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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Section: Resultsmentioning

confidence: 99%

Breeding and feeding biology of the Gurney’s Hawk Geranoaetus poecilochrous in the paramo of Antisana, Ecuador

Vries¹,

Cabot²,

Coello³

et al. 2017

REMCB

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“…We prioritized samples from adults in territorial breeding groups (groups are comprised of unrelated adults; Faaborg et al 1995). On Isla Pinzó n, we sampled only from nonterritorial birds from multiple geographic locales because we were unable to capture adults there.…”

Section: (D) Innate Humoral Immunitymentioning

confidence: 99%

Disease ecology in the Galápagos Hawk ( Buteo galapagoensis ): host genetic diversity, parasite load and natural antibodies

et al. 2005

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An increased susceptibility to disease is one hypothesis explaining how inbreeding hastens extinction in island endemics and threatened species. Experimental studies show that disease resistance declines as inbreeding increases, but data from in situ wildlife systems are scarce. Genetic diversity increases with island size across the entire range of an extremely inbred Galápagos endemic bird, providing the context for a natural experiment examining the effects of inbreeding on disease susceptibility. Extremely inbred populations of Galápagos hawks had higher parasite abundances than relatively outbred populations. We found a significant island effect on constitutively produced natural antibody (NAb) levels and inbred populations generally harboured lower average and less variable NAb levels than relatively outbred populations. Furthermore, NAb levels explained abundance of amblyceran lice, which encounter the host immune system. This is the first study linking inbreeding, innate immunity and parasite load in an endemic, in situ wildlife population and provides a clear framework for assessment of disease risk in a Galápagos endemic.

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“…Polyandry occurs when two males assist to raise the same young (Faaborg et al 1995) as found in Long-eared Owls (Asio otus; Marks et al 2002) and in Boreal Owls (Aegolius funereus, Korpimäki et al 2011).…”

mentioning

confidence: 96%

A Record of Communal Nesting in the Barn Owl (Tyto alba)

Hadad¹,

Roulin

Charter

2015

The Wilson Journal of Ornithology

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Confirmation of cooperative polyandry in the Galapagos hawk ( Buteo galapagoensis )

Cited by 34 publications

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Breeding and feeding biology of the Gurney’s Hawk Geranoaetus poecilochrous in the paramo of Antisana, Ecuador

Breeding and feeding biology of the Gurney’s Hawk Geranoaetus poecilochrous in the paramo of Antisana, Ecuador

Disease ecology in the Galápagos Hawk ( Buteo galapagoensis ): host genetic diversity, parasite load and natural antibodies

A Record of Communal Nesting in the Barn Owl (Tyto alba)

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