Exploring food preferences and the limits of feeding flexibility of seed-eating desert birds
Sergio R. Camín A , Víctor R. Cueto B , Javier Lopez de Casenave C and Luis Marone A D
+ Author Affiliations
- Author Affiliations
A Ecodes (Desert Community Ecology Research Team), Instituto Argentino de Investigaciones de las Zonas Áridas (IADIZA-CONICET), and Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, CC 507, 5500 Mendoza, Argentina.
B Ecodes, Centro de Investigación Esquel de Montaña y Estepa Patagónicas (CIEMEP-CONICET), and Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia SJB, U9200 Esquel, Chubut, Argentina.
C Ecodes, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and IEGEBA (UBA-CONICET), Buenos Aires, Argentina.
D Corresponding author. Email: lmarone@mendoza-conicet.gob.ar
Emu 115(3) 261-269 https://doi.org/10.1071/MU14090
Submitted: 27 October 2014 Accepted: 6 March 2015 Published: 18 May 2015
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.
Additional keywords: Argentina, choice and non-choice trials, forb seeds, grass seeds, habitat degradation, seed size.
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