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Artículo

Effects of livestock grazing on flocks of seed-eating birds in the central monte desert, Argentina

Zarco, AgustínIcon ; Cueto, VíctorIcon ; Sagario, Maria CeciliaIcon ; Marone, LuisIcon
Fecha de publicación: 03/2019
Editorial: National Research Council Canada-NRC Research Press
Revista: Canadian Journal of Zoology
ISSN: 0008-4301
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ecología

Resumen

Animal populations often decline due to habitat disturbance, but the initial response of organisms to human-induced environmental change is usually behavioral. Intra-and inter-specific interactions can restrict or facilitate access to resources, resulting in changes to individual fitness, and resource depletion may affect the frequency and strength of interactions. In birds, it is often assumed that feeding in groups increases foraging efficiency. We assessed how the reduction of seed resources provoked by cattle grazing affected different properties of seed-eating bird flocks in woodlands having the same structural characteristics but differing in seed abundance. Under lower availability of grass seeds (i.e., under grazing), flocks were smaller and less rich and birds showed a lower flocking propensity. This pattern could be explained by three non-exclusive hypotheses. Food reduction caused by grazing (i) decreases the number of seed-eating birds and concomitantly generates smaller flocks; (ii) reduces the density of nuclear species, decreasing the group cohesion in large flocks; (iii) makes large flocks less attractive by increasing individual competence for food. Our results provide evidence that cattle grazing affect the interactions of seed-eating birds and suggest the importance of understanding flocking behavior to bring about management actions.
Palabras clave: FLOCK STRUCTURE , GRAZED WOODLAND , NUCLEAR SPECIES , SEED-EATING BIRDS , WINTER DESERT FLOCKS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/100924
URL: http://www.nrcresearchpress.com/doi/10.1139/cjz-2018-0223
DOI: https://doi.org/10.1139/cjz-2018-0223
Colecciones
Articulos(CIEMEP)
Articulos de CENTRO DE INVESTIGACION ESQUEL DE MONTAÑA Y ESTEPA PATAGONICA
Articulos(IADIZA)
Articulos de INST. ARG DE INVEST. DE LAS ZONAS ARIDAS
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Zarco, Agustín; Cueto, Víctor; Sagario, Maria Cecilia; Marone, Luis; Effects of livestock grazing on flocks of seed-eating birds in the central monte desert, Argentina; National Research Council Canada-NRC Research Press; Canadian Journal of Zoology; 97; 7; 3-2019; 606-611
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