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Abstract:

Biological invasions are a major threat to native species. The red-bellied tree squirrel Callosciurus erythraeus was introduced in Luján, Argentina, in 1970, where it spread rapidly. Squirrels can affect birds through nest predation, interference and competition for food and nesting sites. We aimed to compare community composition, density and richness of birds in forested areas within and outside the range distribution (680 km2 in 2004) of the main population of these squirrels in the country. We selected seven paired sites (each pair had similar vegetation structure and composition) and other 14 sites, half in each condition (with and without squirrels). In each of these 28 sites, we did 4–5 point counts during spring-summer 2008-2009, recording all bird individuals that were seen/heard <10–20 m from the observer. Species richness was rarefied to the smallest number of point counts per site. Community composition differed among sites with and without squirrels, particularly for paired sites. We found no differences in bird density though species richness was higher for paired sites without squirrels. To assess if squirrels do consume bird eggs and if they have any egg-size preference, we conducted cafeteria experiments offering fruit and three eggs of different sizes to individual squirrels kept in a large cage (3×2×2m) for < 24 h. Few squirrels (2/25) consumed the eggs. Our results suggest that squirrels could negatively affect some bird species but not through nest predation. © 2015 Asociacion Argentina de Ecologia.All rights reserved.

Registro:

Documento: Artículo
Título:Impact of red-bellied squirrels on the bird community of the Pampas region, Argentina
Autor:Laura Messetta, M.; Milesi, F.A.; Laura Guichón, M.
Filiación:Ecología de Mamíferos Introducidos (EMI), Departamento de Ciencias Básicas, Universidad Nacional de Luján, Buenos Aires, Argentina
Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA, UNCo– CONICET), Centro de Ecología Aplicada del Neuquén (CEAN), Junín de los Andes, Neuquén, Argentina
Palabras clave:Bird density; Bird species richness; Callosciurus erythraeus; Introduced squirrels; Invasive species; biological invasion; egg size; interference competition; invasive species; native species; nest predation; population density; rodent; spatiotemporal analysis; species richness; Argentina; Buenos Aires [Argentina]; Lujan; Pampas; Aves; Callosciurus erythraeus; Sciuridae; Sciurus; Sciurus aureogaster
Año:2015
Volumen:25
Número:1
Página de inicio:37
Página de fin:45
Título revista:Ecologia Austral
Título revista abreviado:Ecol. Austral
ISSN:03275477
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v25_n1_p37_LauraMessetta

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Citas:

---------- APA ----------
Laura Messetta, M., Milesi, F.A. & Laura Guichón, M. (2015) . Impact of red-bellied squirrels on the bird community of the Pampas region, Argentina . Ecologia Austral, 25(1), 37-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v25_n1_p37_LauraMessetta [ ]
---------- CHICAGO ----------
Laura Messetta, M., Milesi, F.A., Laura Guichón, M. "Impact of red-bellied squirrels on the bird community of the Pampas region, Argentina " . Ecologia Austral 25, no. 1 (2015) : 37-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v25_n1_p37_LauraMessetta [ ]
---------- MLA ----------
Laura Messetta, M., Milesi, F.A., Laura Guichón, M. "Impact of red-bellied squirrels on the bird community of the Pampas region, Argentina " . Ecologia Austral, vol. 25, no. 1, 2015, pp. 37-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v25_n1_p37_LauraMessetta [ ]
---------- VANCOUVER ----------
Laura Messetta, M., Milesi, F.A., Laura Guichón, M. Impact of red-bellied squirrels on the bird community of the Pampas region, Argentina . Ecol. Austral. 2015;25(1):37-45.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v25_n1_p37_LauraMessetta [ ]