Chapter

The Ecology and Evolutionary History of Oligoryzomys Longicaudatus in Southern South America

R. Eduardo Palma, Fernando Torres-Pérez and Dusan Boric-Bargeto

in The Quintessential Naturalist

Published by University of California Press

Published in print July 2007 | ISBN: 9780520098596
Published online March 2012 | e-ISBN: 9780520916159 | DOI: http://dx.doi.org/10.1525/california/9780520098596.003.0018
The Ecology and Evolutionary History of Oligoryzomys Longicaudatus in Southern South America

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This chapter determines the ecology and evolutionary relationships among populations whose results have been synthesized, using life-history traits as well as morphological, chromosomal, and molecular tools. It notes that Oligoryzomys longicaudatus is a conspicuous species of sigmodontine rodent from the southern cone of South America, inhabiting Mediterranean environments and both Temperate and Patagonian forests of Chile and Argentina. The chapter observes that O. longicaudatus exhibits high genetic homogeneity, in spite of inhabiting very distinctive ecogeographic areas across a wide latitudinal gradient. It notes that the evolutionary history of these species has been mediated primarily by the biogeographic events of Pleistocene, with a narrow association to the expansion and retraction of Temperate Forests during the Quatemary. The chapter observes that ecological traits show that these species differentiate from other sympatric sigmodontines in characters such as their large home range, high vagility, and almost exclusively granivorous diet.

Keywords: ecology; evolutionary relationships; Oligoryzomys longicaudatus; sigmodontine rodent; South America; genetic homogeneity; ecogeographic areas; Pleistocene; Temperate Forests; Quatemary

Chapter.  8278 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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