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Habitat selection by the viscacha rat (Octomys mimax, Rodentia: Octodontidae) in a spatially heterogeneous landscape

  • Valeria E. Campos EMAIL logo and Stella M. Giannoni
Published/Copyright: November 7, 2013

Abstract

The viscacha rat Octomys mimax is endemic to western Argentina; it inhabits lowland deserts and uses rocky crevices as resting sites. The aim of this study was to assess macrohabitat selection relative to the occurrence of rocky crevices and to evaluate seasonal variations in macrohabitats selected by this rodent in Ischigualasto Provincial Park, San Juan, Argentina. Random locations were classified as used or available based on signs recorded in rocky crevices. We confirmed the absence of the viscacha rat in macrohabitats with sandy or silty substrates. We provide new records of viscacha rat in creosote bush scrub, the most abundant macrohabitat of the Monte Desert. This result extends the known range of macrohabitat use for this species. The viscacha rat increased the number of rocky crevices used in the dry season, probably because the species increased its foraging area due to the low food resource abundance. Another possible reason is an increase in density due to new births and dispersal of young in this season. The present study highlights the importance of considering signs of presence for species with low capturability as well as of collecting data throughout multiple seasons for a better understanding of habitat selection and species distribution.


Corresponding author: Valeria E. Campos, INTERBIODES, IMCN, Departamento de Biología (FCEFN-UNSJ), Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (Oeste), J5402DCS, San Juan, Argentina; and CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina, e-mail:

Acknowledgments

This research was supported by the Agencia Nacional de Promoción Científica y Tecnológica (PICTO 07-38) through the project “El corredor bioceánico dentro del Parque Provincial Ischigualasto: efectos de la obra y operación de la ruta sobre la fauna silvestre.” We thank the staff of Ischigualasto Provincial Park for providing all the necessary facilities during fieldwork. This study is part of a doctoral thesis of the first author at the Universidad Nacional de Córdoba, Argentina. We acknowledge and are grateful for the help received from all the members of the Interacciones biológicas del desierto (INTERBIODES). The authors are Consejo Nacional de Investigaciones científicas y Técnicas (CONICET) researchers and fellows. Jorgelina Brasca assisted us with language editing.

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Received: 2013-5-3
Accepted: 2013-9-25
Published Online: 2013-11-7
Published in Print: 2014-5-1

©2014 by Walter de Gruyter Berlin/Boston

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