Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina

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...

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Detalles Bibliográficos
Autores principales:	Cittadino, Emilio Alejandro, Busch, Maria, Kravetz, Fernando O.
Publicado:	1998
Materias:	abundance dispersal population dynamics rodent Argentina Akodon azarae
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084301_v76_n6_p1011_Cittadino http://hdl.handle.net/20.500.12110/paper_00084301_v76_n6_p1011_Cittadino
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00084301_v76_n6_p1011_Cittadino
record_format	dspace
spelling	paper:paper_00084301_v76_n6_p1011_Cittadino2023-06-08T14:32:03Z Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina Cittadino, Emilio Alejandro Busch, Maria Kravetz, Fernando O. abundance dispersal population dynamics rodent Argentina Akodon azarae 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. Fil:Cittadino, E.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Busch, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kravetz, F.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084301_v76_n6_p1011_Cittadino http://hdl.handle.net/20.500.12110/paper_00084301_v76_n6_p1011_Cittadino
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	abundance dispersal population dynamics rodent Argentina Akodon azarae
spellingShingle	abundance dispersal population dynamics rodent Argentina Akodon azarae Cittadino, Emilio Alejandro Busch, Maria Kravetz, Fernando O. Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
topic_facet	abundance dispersal population dynamics rodent Argentina Akodon azarae
description	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.
author	Cittadino, Emilio Alejandro Busch, Maria Kravetz, Fernando O.
author_facet	Cittadino, Emilio Alejandro Busch, Maria Kravetz, Fernando O.
author_sort	Cittadino, Emilio Alejandro
title	Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
title_short	Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
title_full	Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
title_fullStr	Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
title_full_unstemmed	Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina
title_sort	population abundance and dispersal in akodon azarae (pampean grassland mouse) in argentina
publishDate	1998
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084301_v76_n6_p1011_Cittadino http://hdl.handle.net/20.500.12110/paper_00084301_v76_n6_p1011_Cittadino
work_keys_str_mv	AT cittadinoemilioalejandro populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina AT buschmaria populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina AT kravetzfernandoo populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina
_version_	1768546282952982528

Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina

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