Patrones de abundancia relativa en ensambles de pequeños roedores, de la región pampeana

Authors

  • David N. Bilenca Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, Pabellón 11, 4° Piso, 1428 Buenos Aires, Argentina
  • Fernando O. Kravetz Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, Pabellón 11, 4° Piso, 1428 Buenos Aires, Argentina

Abstract

We studied the composition of 8 small-rodent communities in the Pampean region of Central Argentina in two different habitats: crop field borders and grasslands. Akodon azarae was the most abundant species in 7 communities. Species diversity and evenness were higher infield borders than in grasslands. Borders had higher proportion of Mus and Calomys and lower proportion of Akodon and Oxymycterus than grasslands.. We fit the data to species-abundance patterns expected according to the “broken stick” model (BS), which is the biological expression of an ideally uniform distribution, and to the “geometric series “ model, which is related to communities with hierarchical structures. The goodness- of-fit tests were rejected in all cases. Moreover, in 7 of 8 cases, BS was rejected because the communities had a stronger hierarchical structure than predicted by the model. Wepropose several interpretations for this: 1) a combination of both competition and temporal variations of niche breadths in determining the species- abundance curves, 2) the number of resources for which the species are competing, 3) the role that interference competition may play in confering the possesion of resources to socially dominant species, and 4) the recruitment of species (Calomys, Mus) from crop areas to field borders. The present proportion of Calomys spp. in agroecosysterns probably exceeds its original proportion in Pampean grasslands.

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Published

1995-06-01

How to Cite

Bilenca, D. N., & Kravetz, F. O. (1995). Patrones de abundancia relativa en ensambles de pequeños roedores, de la región pampeana. Ecología Austral, 5(1), 021–030. Retrieved from https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1679

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Vol. 5 No. 1 (1995)

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