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Can shrub cover increase predation risk for a desert rodent?

Canadian Journal of Zoology

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Abstract

Previous research indicates that predation risk may influence activity patterns, habitat partitioning, and community structure of nocturnal desert rodents. Shrub microhabitat is typically considered safer than open microhabitat for these small mammals. We investigated predation risk for Townsend's ground squirrels (Spermophilus townsendii), which are diurnal desert rodents that detect predators visually and use burrows for refuge. Our results suggested that shrub cover may increase risk for these squirrels by decreasing their ability to escape from predators. Our field experiment indicated that running speeds of juvenile squirrels were lower in shrub (Ceratoides lanata) habitat than in open areas. Shrub cover was also associated with shorter predator-detection distances (mammalian and avian) and fewer refuges (burrow entrances per hectare) than in open areas in one year but not in another. Our study demonstrated that the visual and locomotive obstruction of vegetative cover may increase predation risk for diurnal desert rodents and that elements of habitat-dependent risk may be temporally dynamic.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Can shrub cover increase predation risk for a desert rodent?
Series title:
Canadian Journal of Zoology
Volume
74
Issue:
1
Year Published:
1996
Language:
English
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
p. 157-163
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Zoology
First page:
157
Last page:
163
Number of Pages:
7