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Abstract:

Dispersal of Akodon azarae, the pampean grassland mouse, was studied during different phases of the annual cycle of population abundance in longitudinal habitats in agroecosystems. Dispersal rates were higher in the increasing and declining phases than at times of low and peak densities. The pattern of variation in dispersal rates may have been caused by both population dynamics and structure, as well by changes in habitat variables that influence rodent survival and reproduction. Low dispersal rates in spring were related to reproductive activity, which restricts females' movements and causes large movements of males within their home ranges. In autumn, with increasing density, dispersal should be a good strategy for individuals that did not gain access to vacant sites. In contrast, in early winter, when density is high and there are no vacant sites, the costs of dispersal (mortality and competition) are not compensated for by enhanced chances of reproduction. Finally, dispersal increases after the high mortality experienced by the population in winter, when individuals leave their home ranges, probably because of the impoverishment of the habitat during this period reported in earlier works. Dispersal plays a significant role in the population dynamics of A. azarae and contributes to the persistence of local populations through recolonization.

Registro:

Documento: Artículo
Título:Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
Autor:Cittadino, E.A.; Busch, M.; Kravetz, F.O.
Filiación:Departamento de Biología, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, pabellón II, 4o piso, (1428) Buenos Aires, Argentina
Palabras clave:abundance; dispersal; population dynamics; rodent; Argentina; Akodon azarae
Año:1998
Volumen:76
Número:6
Página de inicio:1011
Página de fin:1018
DOI: http://dx.doi.org/10.1139/z98-022
Título revista:Canadian Journal of Zoology
Título revista abreviado:Can. J. Zool.
ISSN:00084301
CODEN:CJZOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084301_v76_n6_p1011_Cittadino

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Citas:

---------- APA ----------
Cittadino, E.A., Busch, M. & Kravetz, F.O. (1998) . Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina. Canadian Journal of Zoology, 76(6), 1011-1018.
http://dx.doi.org/10.1139/z98-022
---------- CHICAGO ----------
Cittadino, E.A., Busch, M., Kravetz, F.O. "Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina" . Canadian Journal of Zoology 76, no. 6 (1998) : 1011-1018.
http://dx.doi.org/10.1139/z98-022
---------- MLA ----------
Cittadino, E.A., Busch, M., Kravetz, F.O. "Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina" . Canadian Journal of Zoology, vol. 76, no. 6, 1998, pp. 1011-1018.
http://dx.doi.org/10.1139/z98-022
---------- VANCOUVER ----------
Cittadino, E.A., Busch, M., Kravetz, F.O. Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina. Can. J. Zool. 1998;76(6):1011-1018.
http://dx.doi.org/10.1139/z98-022