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Abstract:

Most studies of ecological guilds consider guild membership as a fixed attribute of species, and the guild structure as a fixed attribute of a community. Consequently, almost no study tackled the examination of temporal changes in the guild structure of a particular assemblage. We used data on foraging patterns of central Monte desert birds to assess seasonal differences in resource use by resident species, and to examine seasonal changes in the guild structure of the assemblage. From 1993 until 1999, we quantified the use of foraging substrates, manoeuvres, and height strata, and the utilisation of plants by 18 bird species. Resident species showed different kinds of seasonal dynamics, from no noticeable to drastic changes in their foraging patterns. Seasonal changes in guild structure were remarkable. Only two guilds were present all year round (ground foragers and foliage foragers), although they suffered important species turnover. Three other guilds had a seasonal occurrence: graminivores (during the non-breeding season), arboreal herbivores, and aerial feeders (during the breeding season). Two species changed from one guild to another between seasons. Both presence-absence of migrant species, and changes in the feeding ecology of resident species had an influence on the temporal dynamics of guild structure. These factors appeared to be related with changing resource availability, especially with the birds' ability for facing lean conditions through migration and with the opportunistic use of seasonally superabundant resources. Our results undermine the trust in studies in which guild structure was assessed irrespective of temporal variations. We show also that guild membership is not a fixed attribute of a species: we should rather evaluate the individuals' resource use in a given moment to assign them to a guild, instead of obtaining a single measure purporting to represent a species' fixed attribute. © 2007 Gesellschaft für Ökologie.

Registro:

Documento: Artículo
Título:Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert
Autor:Lopez de Casenave, J.; Cueto, V.; Marone, L.
Filiación:Desert Community Ecology Research Team (Ecodes), Departamento de Ecología, Genética y Evolución, FCEyN, Piso 4, Pab. 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Desert Community Ecology Research Team (Ecodes), IADIZA Institute, CONICET, Casilla de Correos 507, 5500 Mendoza, Argentina
CASEB (Center for Advanced Studies in Ecology and Biodiversity), Pontificia Universidad Católica de Chile, Santiago, Chile
Palabras clave:Argentina; Community ecology; Feeding ecology; Foraging patterns; Guild membership; Migration; Opportunism; Aves
Año:2008
Volumen:9
Número:1
Página de inicio:78
Página de fin:90
DOI: http://dx.doi.org/10.1016/j.baae.2006.08.006
Título revista:Basic and Applied Ecology
Título revista abreviado:Basic Appl. Ecol.
ISSN:14391791
CODEN:BAEAC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14391791_v9_n1_p78_LopezdeCasenave

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Citas:

---------- APA ----------
Lopez de Casenave, J., Cueto, V. & Marone, L. (2008) . Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert. Basic and Applied Ecology, 9(1), 78-90.
http://dx.doi.org/10.1016/j.baae.2006.08.006
---------- CHICAGO ----------
Lopez de Casenave, J., Cueto, V., Marone, L. "Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert" . Basic and Applied Ecology 9, no. 1 (2008) : 78-90.
http://dx.doi.org/10.1016/j.baae.2006.08.006
---------- MLA ----------
Lopez de Casenave, J., Cueto, V., Marone, L. "Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert" . Basic and Applied Ecology, vol. 9, no. 1, 2008, pp. 78-90.
http://dx.doi.org/10.1016/j.baae.2006.08.006
---------- VANCOUVER ----------
Lopez de Casenave, J., Cueto, V., Marone, L. Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert. Basic Appl. Ecol. 2008;9(1):78-90.
http://dx.doi.org/10.1016/j.baae.2006.08.006