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Abstract:

Habitat degradation caused by cattle grazing may be a serious threat for seed-eating birds because the availability of beneficial seeds usually diminishes in grazed areas. Ecologically plastic species might, however, circumvent food deprivation via changes in foraging behaviour. We studied the limits of feeding flexibility and factors affecting seed preferences in Zonotrichia capensis, Diuca diuca, and Saltatricula multicolor. We experimentally assessed preferences for seeds of eight grass and eight forb species by using a protocol that combines choice and non-choice trials, and employed a different batch of experiments to evaluate some plausible causes of different feeding flexibility. On average, birds consumed 45-140% more grass than forb seeds, confirming previous results. Z. capensis preferred several grass and forb seeds, and showed maximum feeding flexibility. S. multicolor and, to a lesser extent, D. diuca, were grass specialists that preferred large and medium-sized grass seeds. The size of forb seeds did not affect preferences. Coat thickness of grass seeds did not seriously reduce consumption levels. Birds showed low ability to feed on resources characteristic of degraded environments (i.e. annual grass seeds). Species-specific differences in behavioural flexibility could be used to predict dietary and numerical responses of seed-eating birds to habitat degradation. © 2015 BirdLife Australia.

Registro:

Documento: Artículo
Título:Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds
Autor:Camín, S.R.; Cueto, V.R.; De Casenave, J.L.; Marone, L.
Filiación:Ecodes (Desert Community Ecology Research Team), Instituto Argentino de Investigaciones de Las Zonas Áridas (IADIZA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, 5500, Argentina
Ecodes Centro de Investigación Esquel de Montaña y Estepa Patagónicas, Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia SJB, Esquel, Chubut, U9200, Argentina
Ecodes Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IEGEBA (UBA-CONICET), Buenos Aires, U9200, Argentina
Palabras clave:Argentina; choice and non-choice trials; forb seeds; grass seeds; habitat degradation; seed size.; cattle; diet; food preference; foraging behavior; granivory; grass; grazing; habitat fragmentation; herb; passerine; seed size; specialist; Argentina; Aves; Bos; Diuca diuca; Saltatricula multicolor; Zonotrichia capensis
Año:2015
Volumen:115
Número:3
Página de inicio:261
Página de fin:269
DOI: http://dx.doi.org/10.1071/MU14090
Título revista:Emu
Título revista abreviado:Emu
ISSN:01584197
CODEN:EMUMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v115_n3_p261_Camin

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Citas:

---------- APA ----------
Camín, S.R., Cueto, V.R., De Casenave, J.L. & Marone, L. (2015) . Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds. Emu, 115(3), 261-269.
http://dx.doi.org/10.1071/MU14090
---------- CHICAGO ----------
Camín, S.R., Cueto, V.R., De Casenave, J.L., Marone, L. "Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds" . Emu 115, no. 3 (2015) : 261-269.
http://dx.doi.org/10.1071/MU14090
---------- MLA ----------
Camín, S.R., Cueto, V.R., De Casenave, J.L., Marone, L. "Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds" . Emu, vol. 115, no. 3, 2015, pp. 261-269.
http://dx.doi.org/10.1071/MU14090
---------- VANCOUVER ----------
Camín, S.R., Cueto, V.R., De Casenave, J.L., Marone, L. Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds. Emu. 2015;115(3):261-269.
http://dx.doi.org/10.1071/MU14090