Patterns of species abundance in Pampean communities of small rodents
The composition of eight small-rodent communities in the Pampean region of central Argentina was studied in two different habitats. Akodon azarae was the most abundant species in seven communities. Species diversity and evenness were higher in field borders than in grasslands. Borders had higher pro...
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| Autores principales: | , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03275477_v5_n1_p21_Bilenca |
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| Sumario: | The composition of eight small-rodent communities in the Pampean region of central Argentina was studied in two different habitats. Akodon azarae was the most abundant species in seven communities. Species diversity and evenness were higher in field borders than in grasslands. Borders had higher proportion of Mus and Calomys and lower proportion of Akodon and Oxymycterus than grasslands. The data were fitted to species-abundance patterns expected according to the "broken stick' model (BS), and to the "geometric series' model. In seven of eight cases, BS was rejected because the communities had a stronger hierarchical structure than predicted by the model. Several interpretations for this are offered. The present proportion of Calomys spp. in the agroecosystems probably exceeds its original proportion in Pampean grasslands. -from English summary |
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