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Abstract:

Differential predation upon tuco-tucos (Ctenomys talarum) by red-backed hawks (Buteo polyosoma) is reported, considering the characteristics that could lead to prey vulnerability and to predator selectivity. Predation was evaluated through analysis of 100 pellets and 20 prey remains collected in coastal grasslands at Mar de Cobo (Buenos Aires, Argentina) during winter (May to August) 2003-2004. The tuco-tucos represented the main component in the diet of red-backed hawks, registering a high consumption of sub-adult individuals (49.3%). Juvenile individuals (42.0%) were overrepresented and adults (8.7%) were underrepresented in relation to their field frequencies (14.4 and 43.1%, respectively), whereas sub-adults did not show significant differences. This high consumption of smaller tuco-tucos would be based on the higher vulnerability of young individuals to predation rather than raptor's handling constraints on bigger individuals. Our results indicate that a strong predator-prey relationship between tuco-tucos and red-backed hawks is established at the study area, and that tuco-tucos represent a key component for the survival of wintering hawks. Reportamos la depredacion diferencial sobre el tuco-tuco (Ctenomys talarum) por el aguilucho comun (Buteo polyosoma), considerando las caracteristicas que podrian determinar la vulnerabilidad de la presa y la selectividad del predador. La depredacion fue evaluada mediante el analisis de 100 egagropilas y 20 restos presa recolectados en pastizales costeros de la localidad de Mar de Cobo (Buenos Aires, Argentina) durante el periodo invernal Mayo-Agosto de 2003-2004. El tuco-tuco represento el principal componente en la dieta del aguilucho comun, registrandose un alto consumo de individuos subadultos (49.3%). Los individuos juveniles (42.0%) fueron sobrerrepresentados y los adultos (8.7%) fueron subrepresentados en la dieta en relacion a sus frecuencias en el campo (14.4 y 43.1%, respectivamente), mientras que los subadultos no mostraron diferencias significativas. Este elevado consumo de individuos mas pequenos radicaria en una mayor vulnerabilidad a la depredacion de los juveniles mas que en restricciones de manipuleo del predador sobre las presas mas grandes. Nuestros resultados indican que existe una estrecha relacion predador-presa entre el tuco-tuco y el aguilucho comun, y que los tuco-tucos representan un componente clave para la supervivencia invernal de los aguiluchos. © 2009 Taylor & Francis.

Registro:

Documento: Artículo
Título:Predation upon the subterranean rodent Ctenomys talarum (tuco-tucos) by Buteo polyosoma (red-backed hawks) in coastal grasslands of Argentina
Autor:Baladrón, A.V.; Malizia, A.I.; Bó, M.S.
Filiación:Laboratorio de Vertebrados, Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
Consejo Nacional de Investigaciones Cientificas y Técnicas - CONICET, Buenos Aires, Argentina
Laboratorio de Ecofisiología, Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
Idioma: Inglés
Palabras clave:Age classes; Predator-prey relationship; Red-backed hawk; Subterranean rodent; Tuco-tuco; Winter diet; Accipitrinae; Buteo polyosoma; Ctenomyidae; Ctenomys talarum; Raptores; Rodentia; Sus
Año:2009
Volumen:44
Número:2
Página de inicio:61
Página de fin:65
DOI: http://dx.doi.org/10.1080/01650520902915022
Título revista:Studies on Neotropical Fauna and Environment
Título revista abreviado:Stud. Neotrop. Fauna Environ.
ISSN:01650521
CODEN:SNFED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01650521_v44_n2_p61_Baladron

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Citas:

---------- APA ----------
Baladrón, A.V., Malizia, A.I. & Bó, M.S. (2009) . Predation upon the subterranean rodent Ctenomys talarum (tuco-tucos) by Buteo polyosoma (red-backed hawks) in coastal grasslands of Argentina. Studies on Neotropical Fauna and Environment, 44(2), 61-65.
http://dx.doi.org/10.1080/01650520902915022
---------- CHICAGO ----------
Baladrón, A.V., Malizia, A.I., Bó, M.S. "Predation upon the subterranean rodent Ctenomys talarum (tuco-tucos) by Buteo polyosoma (red-backed hawks) in coastal grasslands of Argentina" . Studies on Neotropical Fauna and Environment 44, no. 2 (2009) : 61-65.
http://dx.doi.org/10.1080/01650520902915022
---------- MLA ----------
Baladrón, A.V., Malizia, A.I., Bó, M.S. "Predation upon the subterranean rodent Ctenomys talarum (tuco-tucos) by Buteo polyosoma (red-backed hawks) in coastal grasslands of Argentina" . Studies on Neotropical Fauna and Environment, vol. 44, no. 2, 2009, pp. 61-65.
http://dx.doi.org/10.1080/01650520902915022
---------- VANCOUVER ----------
Baladrón, A.V., Malizia, A.I., Bó, M.S. Predation upon the subterranean rodent Ctenomys talarum (tuco-tucos) by Buteo polyosoma (red-backed hawks) in coastal grasslands of Argentina. Stud. Neotrop. Fauna Environ. 2009;44(2):61-65.
http://dx.doi.org/10.1080/01650520902915022