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Abstract:

We examined seasonal changes in microhabitat use by the murid rodents Akodon azarae and Calomys laucha in agroecosystems of the former pampa region of Argentina. In summer, trap data showed that both species had low densities and were almost equally distributed between the mature cropfields and their surrounding weedy borders. Analysis of vegetation at the trap sites revealed no selection for microhabitats at the borders, whereas in the cropfields both species shared preferences for covered microhabitats. In contrast, winter data revealed a sharp habitat segregation, being Calomys numerically dominant in post-harvest cropfields and Akodon more abundant in borders. Moreover, there were clear differences in microhabitat selection at the borders, A. azarae occupying the more covered microhabitats and C. laucha the less covered. Breadth and overlap of niches were calculated using principal component analysis, in order to recognize interspecific competition and its influence on community niche space. Available evidence indicates that the structure of this rodent community is strongly influenced by seasonal changes in habitat structure and rodent abundance. The socially dominant A. azarae retains the best part of the available niche space, a fact becoming more evident under the harsh winter conditions.

Registro:

Documento: Artículo
Título:Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
Autor:Bilenca, D.N.; Kravetz, F.O.
Filiación:Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (1428), Buenos Aires, Argentina
Palabras clave:Agroecosystems; Akodon azarae; Argentina; Calomys laucha; Habitat selection; Murid rodents; Niche overlap; Seasonality; Akodon azarae; Akodon azarae; Calomys laucha; Calomys laucha; Muridae; Rodentia
Año:1999
Volumen:34
Número:3
Página de inicio:129
Página de fin:136
DOI: http://dx.doi.org/10.1076/snfe.34.3.129.8913
Título revista:Studies on Neotropical Fauna and Environment
Título revista abreviado:Stud. Neotrop. Fauna Environ.
ISSN:01650521
CODEN:SNFED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01650521_v34_n3_p129_Bilenca

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Citas:

---------- APA ----------
Bilenca, D.N. & Kravetz, F.O. (1999) . Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina. Studies on Neotropical Fauna and Environment, 34(3), 129-136.
http://dx.doi.org/10.1076/snfe.34.3.129.8913
---------- CHICAGO ----------
Bilenca, D.N., Kravetz, F.O. "Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina" . Studies on Neotropical Fauna and Environment 34, no. 3 (1999) : 129-136.
http://dx.doi.org/10.1076/snfe.34.3.129.8913
---------- MLA ----------
Bilenca, D.N., Kravetz, F.O. "Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina" . Studies on Neotropical Fauna and Environment, vol. 34, no. 3, 1999, pp. 129-136.
http://dx.doi.org/10.1076/snfe.34.3.129.8913
---------- VANCOUVER ----------
Bilenca, D.N., Kravetz, F.O. Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina. Stud. Neotrop. Fauna Environ. 1999;34(3):129-136.
http://dx.doi.org/10.1076/snfe.34.3.129.8913