Chapter

Effects of Biotic Interactions on Spatial Behavior of Small Mammals in a Semiarid Community in North-Central Chile

John A. Yunger, Peter L. Meserve and Julio R. Gutiérrez

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/9780520098596.003.0006
Effects of Biotic Interactions on Spatial Behavior of Small Mammals in a Semiarid Community in North-Central Chile

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This chapter examines the live-trap data of four small mammal species for evidence of behavioral responses to predator and/or competitor exclusions in a semiarid thorn scrub community in north-central Chile. It notes that the species include an herbivorous hystricognath rodent, Octodon degus, a granivorous/herbivorous sigmodontine rodent, Phyllotis darwini, and two omnivorous/insectivorous sigmodontines, Abrothrix olivaceus and Abrothrix longipilis. The chapter observes that significant numerical effects of predation on O. degus are present during the study; although none are detected on P. darwini, previous analyses showed significant but small magnitude effects of predation. It further observes that both species had significant effects of predation on survival. The chapter also examines effects of biotic interactions on mean distance between successive captures for consecutive six-month seasons over the course of a 36-month period during and following an El Niño event in 1991–1994.

Keywords: behavioral responses; north-central Chile; herbivorous hystricognath; Octodon degus; granivorous/herbivorous sigmodontine; Phyllotis darwini; omnivorous/insectivorous sigmodontines; Abrothrix olivaceus; Abrothrix longipilis; El Niño event

Chapter.  7644 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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