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dc.contributor.author
Juhant, Matias Alejandro
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dc.contributor.author
Terrien, Jean-François
dc.contributor.author
Areta, Juan Ignacio
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dc.date.available
2023-07-25T13:23:45Z
dc.date.issued
2022-06
dc.identifier.citation
Juhant, Matias Alejandro; Terrien, Jean-François; Areta, Juan Ignacio; Winter irruption of two Geranoaetus hawks in the Monte Desert of Argentina; Raptor Research Foundation; Journal of Raptor Research; 56; 2; 6-2022; 180-189
dc.identifier.issn
0892-1016
dc.identifier.uri
http://hdl.handle.net/11336/205265
dc.description.abstract
Winter irruption refers to an unpredictable increase in the number of individuals usually dominated by one age class, either juvenile or adult, into a given area as a response to fluctuations in the food supply. Irruptions are well documented for avian predators breeding in the Arctic and Subarctic regions whereby individuals irrupt into irregular nonbreeding areas across the Boreal Temperate Region. However, this phenomenon is largely unknown across the Austral Temperate Region. We studied the age class composition of Variable Hawks (Geranoaetus polyosoma) and Black-chested Buzzard-Eagles (G. melanoleucus) during six austral winters (nonbreeding season) at an overlapping breeding and overwintering area in the Monte Desert (semiarid grassland and shrub steppes) of the Andean foothills at Mendoza province in central Argentina (33°S). We measured the overall abundance per winter (combining the five age classes) and calculated the relative abundance per age class for each winter of both species. We used the ratio of total number of individuals observed in a single winter/the total hours of observation per winter as an index of abundance, because sampling effort was not equal across winters. We found that (1) both species exhibited winter irruptions, (2) the irruptions were largely driven by a marked increase of Basic I individuals (the youngest age class); at the same time, Basic V individuals (the oldest age class) exhibited their (modestly) lowest abundance, and (3) winter irruptions might be species-specific, as the responses differed between the two species, with a joint irruption event in the austral winter 2016 and a second irruptive event only recorded for Black-chested Buzzard-Eagles in the austral winter of 2018. We posit that the marked increase of Basic I individuals during the irruptive winters cannot be fully explained by successful breeding of the local population, and is likely largely a result of individuals born elsewhere, presumably at southern latitudes, and overwintering at our study site in central Argentina.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Raptor Research Foundation
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
AGE CLASSES
dc.subject
BLACK-CHESTED BUZZARD-EAGLE
dc.subject
GERANOAETUS MELANOLEUCUS
dc.subject
GERANOAETUS POLYOSOMA
dc.subject
NONBREEDING SEASON
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SEMIARID GRASSLAND
dc.subject
SHRUB STEPPES
dc.subject
SOUTH AMERICA
dc.subject
VARIABLE HAWK
dc.subject.classification
Zoología, Ornitología, Entomología, Etología
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Winter irruption of two Geranoaetus hawks in the Monte Desert of Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-07-06T22:20:27Z
dc.journal.volume
56
dc.journal.number
2
dc.journal.pagination
180-189
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Lawrence
dc.description.fil
Fil: Juhant, Matias Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta-Jujuy. Instituto de Bio y Geociencias del Noroeste Argentino. Laboratorio de Ecología, Comportamiento y Sonidos Naturales. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto de Bio y Geociencias del Noroeste Argentino. Laboratorio de Ecología, Comportamiento y Sonidos Naturales; Argentina
dc.description.fil
Fil: Terrien, Jean-François. Acopian Center For Conservation Learning; Estados Unidos
dc.description.fil
Fil: Areta, Juan Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta-Jujuy. Instituto de Bio y Geociencias del Noroeste Argentino. Laboratorio de Ecología, Comportamiento y Sonidos Naturales. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto de Bio y Geociencias del Noroeste Argentino. Laboratorio de Ecología, Comportamiento y Sonidos Naturales; Argentina
dc.journal.title
Journal of Raptor Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3356/JRR-20-121
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