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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Autores principales: Cittadino, E.A., Busch, M., Kravetz, F.O.
Formato: JOUR
Materias:
abundance
dispersal
population dynamics
rodent
Argentina
Akodon azarae
Acceso en línea: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
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spelling todo:paper_00084301_v76_n6_p1011_Cittadino2023-10-03T14:06:06Z Population abundance and dispersal in Akodon azarae (pampean grassland mouse) in Argentina Cittadino, E.A. Busch, M. Kravetz, F.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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, E.A.
Busch, M.
Kravetz, F.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.
format JOUR
author Cittadino, E.A.
Busch, M.
Kravetz, F.O.
author_facet Cittadino, E.A.
Busch, M.
Kravetz, F.O.
author_sort Cittadino, E.A.
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
url http://hdl.handle.net/20.500.12110/paper_00084301_v76_n6_p1011_Cittadino
work_keys_str_mv AT cittadinoea populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina
AT buschm populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina
AT kravetzfo populationabundanceanddispersalinakodonazaraepampeangrasslandmouseinargentina
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