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Abstract:

We assess whether the knowledge of livestock diet helps to link grazing effects with changes in plant cover and soil seed bank size, aiming at inferring the consequences of grazing on seed-eating animals. Specifically, we test whether continuous and heavy grazing reduce the cover, number of reproductive structures and seed reserves of the same grass species whose seeds are selected and preferred by granivorous animals in the central Monte desert, Argentina. Grass cover and the number of grass spikes usually diminished under grazing conditions in the two localities studied (Telteca and Ñacuñán), and soil seed bank was consistently reduced in all three years evaluated owing to a decline of perennial grass and forb seeds. In particular, the abundance of those seeds selected and preferred by birds and ants (in all cases grass species) declined 70-92% in Ñacuñán, and 52-72% in Telteca. Reduction of perennial grass cover and spike number in grazed sites reinforced the causal link between livestock grazing and the decline of grass soil seed reserves throughout failed plant reproduction. Grass seed bank depletion suggests that grazing may trigger a "cascade" of mechanisms that affect the abundance and persistence of valuable fodder species as well as the availability of seed resources for granivorous animals. © 2013 Elsevier Masson SAS.

Registro:

Documento: Artículo
Título:Grazing impact on desert plants and soil seed banks: Implications for seed-eating animals
Autor:Pol, R.G.; Sagario, M.C.; Marone, L.
Filiación:Desert Community Ecology Research Team (Ecodes), IADIZA-CONICET, Casilla de Correo 507, 5500 Mendoza, Argentina
Desert Community Ecology Research Team (Ecodes), Departamento de Ecología, Genética y Evolución, FCEyN, Universidad de Buenos Aires, Buenos Aires, Argentina
ICB, Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, Mendoza, Argentina
Idioma: Inglés
Palabras clave:Cascade causality; Disturbance ecology; Livestock diet; Seed-eating animals' diet; desert; ecological impact; environmental disturbance; food availability; granivory; grass; grazing; livestock; plant community; seed bank; seed predation; vegetation dynamics; Argentina; Mendoza; Monte Desert
Año:2014
Volumen:55
Página de inicio:58
Página de fin:65
DOI: http://dx.doi.org/10.1016/j.actao.2013.11.009
Título revista:Acta Oecologica
Título revista abreviado:Acta Oecol.
ISSN:1146609X
CODEN:ACOEE
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_1146609X_v55_n_p58_Pol

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Citas:

---------- APA ----------
Pol, R.G., Sagario, M.C. & Marone, L. (2014) . Grazing impact on desert plants and soil seed banks: Implications for seed-eating animals. Acta Oecologica, 55, 58-65.
http://dx.doi.org/10.1016/j.actao.2013.11.009
---------- CHICAGO ----------
Pol, R.G., Sagario, M.C., Marone, L. "Grazing impact on desert plants and soil seed banks: Implications for seed-eating animals" . Acta Oecologica 55 (2014) : 58-65.
http://dx.doi.org/10.1016/j.actao.2013.11.009
---------- MLA ----------
Pol, R.G., Sagario, M.C., Marone, L. "Grazing impact on desert plants and soil seed banks: Implications for seed-eating animals" . Acta Oecologica, vol. 55, 2014, pp. 58-65.
http://dx.doi.org/10.1016/j.actao.2013.11.009
---------- VANCOUVER ----------
Pol, R.G., Sagario, M.C., Marone, L. Grazing impact on desert plants and soil seed banks: Implications for seed-eating animals. Acta Oecol. 2014;55:58-65.
http://dx.doi.org/10.1016/j.actao.2013.11.009