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Abstract:

Flexibility of foraging behaviour affects our capacity to predict ecological outputs such as population responses to habitat change. Some birds forage following rules of absolute value of the food item (i.e., absolute valuation). Their realized diet is strongly correlated with the profitability of the food item and it is predictable. Consumers, however, do not always follow absolute rules. Opportunistic foragers adjust food consumption based on the availability of the food item. Their diet is still predictable but more elusive. Relativistic or context-dependent foragers change the ranks of food preferences depending on the presence of alternative food options in the choice set. Predicting their contingent diet is particularly difficult. We tested if the context of seed availability affects foraging decisions of three seed-eating bird species (the Rufous-collared Sparrow (Zonotrichia capensis (Statius Muller, 1776)), the Many-colored Chaco Finch (Saltatricula multicolor (Burmeister, 1860)), and the Common Diuca Finch (Diuca diuca (Molina, 1782))) using choice experiments aimed at detecting if seed preferences for two types of target seeds changed according to context. Birds showed very similar rankings of preferences for target seeds; however, preferences for attractive food items were not fixed but often increased in less valuable contexts. Although results imply some degree of context-dependent behaviour, predictability of bird diet was preserved because the ranking of preferences remained mostly unchanged between contexts (and among bird species), and the higher consumption of target grass seeds in a less attractive context was widely expected from the intrinsic properties of the seeds. © 2015(Publisher Name) All Rights Reserved.

Registro:

Documento: Artículo
Título:Context-dependent foraging by seed-eating birds does not necessarily mean low ecological predictability
Autor:Marone, L.; Camín, S.R.; Cueto, V.R.
Filiación:Desert Community Ecology Research Team (Ecodes), IADIZA–CONICET Mendoza, Casilla de Correo 507, Mendoza, 5500, Argentina
Ecodes Departamento de Ecología, Genética y Evolución FCEyN and Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), FCEyN Universidad de Buenos Aires y CONICET, Buenos Aires, Argentina
Ecodes, Centro de Investigación Esquel de Montaña y Estepa Patagónicas (CIEMEP–CONICET), Universidad Nacional de la Patagonia SJB, Esquel, Chubut, U9200, Argentina
Palabras clave:Context dependence; Ecological predictability; Environmental change; Feeding experiments; Rational food choice; food consumption; food preference; foraging behavior; habitat availability; passerine; profitability; Aves; Diuca; Diuca diuca; Saltatricula multicolor; Zonotrichia capensis
Año:2015
Volumen:93
Número:5
Página de inicio:353
Página de fin:359
DOI: http://dx.doi.org/10.1139/cjz-2014-0289
Título revista:Canadian Journal of Zoology
Título revista abreviado:Can. J. Zool.
ISSN:00084301
CODEN:CJZOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084301_v93_n5_p353_Marone

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Citas:

---------- APA ----------
Marone, L., Camín, S.R. & Cueto, V.R. (2015) . Context-dependent foraging by seed-eating birds does not necessarily mean low ecological predictability. Canadian Journal of Zoology, 93(5), 353-359.
http://dx.doi.org/10.1139/cjz-2014-0289
---------- CHICAGO ----------
Marone, L., Camín, S.R., Cueto, V.R. "Context-dependent foraging by seed-eating birds does not necessarily mean low ecological predictability" . Canadian Journal of Zoology 93, no. 5 (2015) : 353-359.
http://dx.doi.org/10.1139/cjz-2014-0289
---------- MLA ----------
Marone, L., Camín, S.R., Cueto, V.R. "Context-dependent foraging by seed-eating birds does not necessarily mean low ecological predictability" . Canadian Journal of Zoology, vol. 93, no. 5, 2015, pp. 353-359.
http://dx.doi.org/10.1139/cjz-2014-0289
---------- VANCOUVER ----------
Marone, L., Camín, S.R., Cueto, V.R. Context-dependent foraging by seed-eating birds does not necessarily mean low ecological predictability. Can. J. Zool. 2015;93(5):353-359.
http://dx.doi.org/10.1139/cjz-2014-0289