Dieta del Águila Mora (Geranoaetus melanoleucus) en una transecta oeste–este en el ecotono norpatagónico

Ana Trejo; Marcelo Kun; Susana Seijas

doi:10.56178/eh.v21i1.796

Articles Published 01 August 2006 https://doi.org/10.56178/eh.v21i1.796

Diet of Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) in a west–east transect in the ecotone of northern Patagonia

Black-chested Buzzard-Eagle diet Geranoaetus melanoleucus native rodents Patagonia west-east gradient

Ana Trejo Centro Regional Universitario Bariloche, Universidad Nacional del Comahue. 8400 San Carlos de Bariloche, Río Negro, Argentina

Marcelo Kun Centro Regional Universitario Bariloche, Universidad Nacional del Comahue. 8400 San Carlos de Bariloche, Río Negro, Argentina

Susana Seijas Centro Regional Universitario Bariloche, Universidad Nacional del Comahue. 8400 San Carlos de Bariloche, Río Negro, Argentina

Abstract

The diet of Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) was studied during 2002-2003 breeding season in five sites located on a west–east transect in the ecotone between the subantarctic forests and the Patagonian steppe, in Andean Río Negro Province, Argentina. This area is characterized by a heterogeneous habitat determined by a west–east decreasing precipitation gradient. We identified 525 preys from 271 pellets collected under perches or nests. Prey composition (considering the total sample) was: 51% rodents (mostly native sigmodontine rodents under 200 g), 25% lagomorphs, 3% other mammals, 8% birds, 1% reptiles, and 12% arthropods. Our results contrast with those of the rest of the studies on this bird made both in Chile and Argentina, where lagomorphs predominate in the diet and sigmodontine rodents made up a lesser proportion. Analyzing the diet from different localities, the western (more humid) sites presented rodent-dominated diets, whereas the eastern (more arid) ones presented lagomorph-dominated diets. We attribute these differences to the abundance of sigmodontine rodents in the more humid sites due to habitat heterogeneity, and to the eagle’s opportunistic feeding behaviour.

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References

CABRERA AL (1976) Regiones fitogeográficas argenti-nas. Pp. 1–85 en: Enciclopedia argentina de agriculturay jardinería. Tomo II. Fascículo 1. ACME, Buenos Aires
CHEHÉBAR C Y MARTIN S (1989) Guía para el reconoci-miento de los pelos de los mamíferos de la Patago-nia. Doñana, Acta Vertebrata 6:247–291
HIRALDO F, DONÁZAR JA, CEBALLOS O, TRAVAINI A,BUSTAMANTE J Y FUNES M (1995) Breeding biology ofa Grey Eagle-buzzard population in Patagonia.Wilson Bulletin 107:675–685
HOWARD WE Y AMAYA JN (1975) European rabbit in-vades western Argentina. Journal of Wildlife Man-agement 39:757–761
DEL HOYO J, ELLIOTT A Y SARGATAL J (1994) Handbook ofthe birds of the world. Volume 2. New World vultures toguineafowl. Lynx Edicions, Barcelona
IRIARTE JA, FRANKLIN WL Y JOHNSON WE (1990) Dietsof sympatric raptors in southern Chile. Journal ofRaptor Research 24:41–46
JAKSIC FM Y MARTI CD (1984) Comparative food habitsof Bubo owls in Mediterranean-type ecosystems.Condor 86:288–296
JIMÉNEZ JE Y JAKSIC FM (1989) Behavioral ecology ofGrey Eagle-buzzards, Geranoaetusmelanoleucus, incentral Chile. Condor 91:913–921
JIMÉNEZ JE Y JAKSIC FM (1990) Historia natural deláguila Geranoaetus melanoleucus: una revisión. Hor-nero 13:97–110
JOHNSON RA Y WICHERN DW (1998) Applied multivari-ate statistical analysis. Prentice Hall, Upper SaddleRiver
MARTI CD (1987) Raptor food habits studies. Pp. 57–80en: MILLSAP BA, KLINE KW Y BIRD DM (eds) Raptormanagement techniques manual. National WildlifeFederation, Washington DC
MASSOIA E (1988) Pequeños mamíferos depredadospor Geranoaetus melanoleucus en el Paraje Confluen-cia, departamento Collón Cura, provincia deNeuquén. BoletínCientíficoAPRONA 2:23–31
MAZZARINO MJ, BERTILLER M, SCHLICHTER T Y GOBBIM (1998) Nutrient cycling in Patagonia ecosystems.Ecología Austral 8:167–181
PARDIÑAS UFJ Y CIRIGNOLI S (2002) Bibliografía comen-tada sobre los análisis de egagrópilas de aves rapa-ces en Argentina. Ornitología Neotropical 13:31–59
PARUELO JM, BELTRÁN A, JOBBÁGY E, SALA OE YGOLLUSCIO RA (1998) The climate of Patagonia:general patterns and controls on biotic processes.EcologíaAustral 8:85–101
PAVEZ E, GONZÁLEZ CA Y JIMÉNEZ JE (1992) Diet shiftsof Black-chested Eagles (Geranoaetus melanoleucus)from native prey to European rabbits in Chile.Journal of Raptor Research 26:27–32
PEARSON OP (1995) Annotated keys for identifyingsmall mammals living in or near Nahuel HuapiNational Park or Lanín National Park, southernArgentina. Mastozoología Neotropical 2:99–148
PREVOSTI FJ Y PARDIÑAS UFJ (2001) Variacionescoriológicas de Lyncodon patagonicus (Carnivora,Mustelidae) durante el cuaternario. MastozoologíaNeotropical 8:21–39
SCHLATTER RP, YÁÑEZ JL Y JAKSIC FM (1980) Food-nicherelationships between Chilean Eagles and Red-backed Buzzards in central Chile. Auk 97:897–898
SCHLICHTER T Y LACLAU P (1998) Ecotono estepa-bos-que y plantaciones forestales en la Patagonia norte.Ecología Austral 8:285–296
TETA P, PANTI C, ANDRADE A Y PÉREZ A (2001) Ampli-tud y composición de la dieta de Bubo virginianus(Aves: Strigiformes: Strigidae) en la Patagonianoroccidental argentina. Boletín de la Sociedad Bioló-gica de Concepción 72:125–132
TETA P, PREVOSTI FJ Y TREJO A (en prensa) Raptor pre-dation and new locality records for the poorlyknown Patagonian weasel (Lyncodon patagonicus)(Carnivora: Mustelidae). Mammalia
TREJO A Y GRIGERA D (1998) Food habits of the GreatHorned Owl (Bubo virginianus) in a Patagoniansteppe in Argentina. Journal of Raptor Research32:306–311
TREJO A, KUN M, SAHORES M Y SEIJAS S (2005) Dietoverlap and prey size of two owls in the forest–steppe ecotone of southern Argentina. OrnitologíaNeotropical 16:539–546

How to cite

Ana Trejo, Marcelo Kun, Susana Seijas (2006). Diet of Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) in a west–east transect in the ecotone of northern Patagonia. El Hornero, Vol. 21 No. 1 (2006), 31-36. https://doi.org/10.56178/eh.v21i1.796

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[1] CABRERA AL (1976) Regiones fitogeográficas argenti-nas. Pp. 1–85 en: Enciclopedia argentina de agriculturay jardinería. Tomo II. Fascículo 1. ACME, Buenos Aires

[2] CHEHÉBAR C Y MARTIN S (1989) Guía para el reconoci-miento de los pelos de los mamíferos de la Patago-nia. Doñana, Acta Vertebrata 6:247–291

[3] HIRALDO F, DONÁZAR JA, CEBALLOS O, TRAVAINI A,BUSTAMANTE J Y FUNES M (1995) Breeding biology ofa Grey Eagle-buzzard population in Patagonia.Wilson Bulletin 107:675–685

[4] HOWARD WE Y AMAYA JN (1975) European rabbit in-vades western Argentina. Journal of Wildlife Man-agement 39:757–761

[5] DEL HOYO J, ELLIOTT A Y SARGATAL J (1994) Handbook ofthe birds of the world. Volume 2. New World vultures toguineafowl. Lynx Edicions, Barcelona

[6] IRIARTE JA, FRANKLIN WL Y JOHNSON WE (1990) Dietsof sympatric raptors in southern Chile. Journal ofRaptor Research 24:41–46

[7] JAKSIC FM Y MARTI CD (1984) Comparative food habitsof Bubo owls in Mediterranean-type ecosystems.Condor 86:288–296

[8] JIMÉNEZ JE Y JAKSIC FM (1989) Behavioral ecology ofGrey Eagle-buzzards, Geranoaetusmelanoleucus, incentral Chile. Condor 91:913–921

[9] JIMÉNEZ JE Y JAKSIC FM (1990) Historia natural deláguila Geranoaetus melanoleucus: una revisión. Hor-nero 13:97–110

[10] JOHNSON RA Y WICHERN DW (1998) Applied multivari-ate statistical analysis. Prentice Hall, Upper SaddleRiver

[11] MARTI CD (1987) Raptor food habits studies. Pp. 57–80en: MILLSAP BA, KLINE KW Y BIRD DM (eds) Raptormanagement techniques manual. National WildlifeFederation, Washington DC

[12] MASSOIA E (1988) Pequeños mamíferos depredadospor Geranoaetus melanoleucus en el Paraje Confluen-cia, departamento Collón Cura, provincia deNeuquén. BoletínCientíficoAPRONA 2:23–31

[13] MAZZARINO MJ, BERTILLER M, SCHLICHTER T Y GOBBIM (1998) Nutrient cycling in Patagonia ecosystems.Ecología Austral 8:167–181

[14] PARDIÑAS UFJ Y CIRIGNOLI S (2002) Bibliografía comen-tada sobre los análisis de egagrópilas de aves rapa-ces en Argentina. Ornitología Neotropical 13:31–59

[15] PARUELO JM, BELTRÁN A, JOBBÁGY E, SALA OE YGOLLUSCIO RA (1998) The climate of Patagonia:general patterns and controls on biotic processes.EcologíaAustral 8:85–101

[16] PAVEZ E, GONZÁLEZ CA Y JIMÉNEZ JE (1992) Diet shiftsof Black-chested Eagles (Geranoaetus melanoleucus)from native prey to European rabbits in Chile.Journal of Raptor Research 26:27–32

[17] PEARSON OP (1995) Annotated keys for identifyingsmall mammals living in or near Nahuel HuapiNational Park or Lanín National Park, southernArgentina. Mastozoología Neotropical 2:99–148

[18] PREVOSTI FJ Y PARDIÑAS UFJ (2001) Variacionescoriológicas de Lyncodon patagonicus (Carnivora,Mustelidae) durante el cuaternario. MastozoologíaNeotropical 8:21–39

[19] SCHLATTER RP, YÁÑEZ JL Y JAKSIC FM (1980) Food-nicherelationships between Chilean Eagles and Red-backed Buzzards in central Chile. Auk 97:897–898

[20] SCHLICHTER T Y LACLAU P (1998) Ecotono estepa-bos-que y plantaciones forestales en la Patagonia norte.Ecología Austral 8:285–296

[21] TETA P, PANTI C, ANDRADE A Y PÉREZ A (2001) Ampli-tud y composición de la dieta de Bubo virginianus(Aves: Strigiformes: Strigidae) en la Patagonianoroccidental argentina. Boletín de la Sociedad Bioló-gica de Concepción 72:125–132

[22] TETA P, PREVOSTI FJ Y TREJO A (en prensa) Raptor pre-dation and new locality records for the poorlyknown Patagonian weasel (Lyncodon patagonicus)(Carnivora: Mustelidae). Mammalia

[23] TREJO A Y GRIGERA D (1998) Food habits of the GreatHorned Owl (Bubo virginianus) in a Patagoniansteppe in Argentina. Journal of Raptor Research32:306–311

[24] TREJO A, KUN M, SAHORES M Y SEIJAS S (2005) Dietoverlap and prey size of two owls in the forest–steppe ecotone of southern Argentina. OrnitologíaNeotropical 16:539–546