Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina

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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 thei...

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Autores principales: Bilenca, David Norberto, Kravetz, Fernando O.
Publicado: 1999
Materias:
Agroecosystems
Akodon azarae
Argentina
Calomys laucha
Habitat selection
Murid rodents
Niche overlap
Seasonality
Muridae
Rodentia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01650521_v34_n3_p129_Bilenca
http://hdl.handle.net/20.500.12110/paper_01650521_v34_n3_p129_Bilenca
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01650521_v34_n3_p129_Bilenca
record_format dspace
spelling paper:paper_01650521_v34_n3_p129_Bilenca2023-06-08T15:14:46Z Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina Bilenca, David Norberto Kravetz, Fernando O. Agroecosystems Akodon azarae Argentina Calomys laucha Habitat selection Murid rodents Niche overlap Seasonality Akodon azarae Akodon azarae Calomys laucha Calomys laucha Muridae Rodentia 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. Fil:Bilenca, D.N. 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. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01650521_v34_n3_p129_Bilenca http://hdl.handle.net/20.500.12110/paper_01650521_v34_n3_p129_Bilenca
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Agroecosystems
Akodon azarae
Argentina
Calomys laucha
Habitat selection
Murid rodents
Niche overlap
Seasonality
Akodon azarae
Akodon azarae
Calomys laucha
Calomys laucha
Muridae
Rodentia
spellingShingle Agroecosystems
Akodon azarae
Argentina
Calomys laucha
Habitat selection
Murid rodents
Niche overlap
Seasonality
Akodon azarae
Akodon azarae
Calomys laucha
Calomys laucha
Muridae
Rodentia
Bilenca, David Norberto
Kravetz, Fernando O.
Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
topic_facet Agroecosystems
Akodon azarae
Argentina
Calomys laucha
Habitat selection
Murid rodents
Niche overlap
Seasonality
Akodon azarae
Akodon azarae
Calomys laucha
Calomys laucha
Muridae
Rodentia
description 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.
author Bilenca, David Norberto
Kravetz, Fernando O.
author_facet Bilenca, David Norberto
Kravetz, Fernando O.
author_sort Bilenca, David Norberto
title Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
title_short Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
title_full Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
title_fullStr Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
title_full_unstemmed Seasonal changes in microhabitat use and niche overlap between Akodon azarae and Calomys laucha (Rodentia, Muridae) in agroecosystems of central Argentina
title_sort seasonal changes in microhabitat use and niche overlap between akodon azarae and calomys laucha (rodentia, muridae) in agroecosystems of central argentina
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01650521_v34_n3_p129_Bilenca
http://hdl.handle.net/20.500.12110/paper_01650521_v34_n3_p129_Bilenca
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AT kravetzfernandoo seasonalchangesinmicrohabitatuseandnicheoverlapbetweenakodonazaraeandcalomyslaucharodentiamuridaeinagroecosystemsofcentralargentina
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