The effects of livestock on California ground squirrels (Spermophilus beecheyii)

Jeffrey Fehmi, Sabrina E. Russo, James W. Bartolome

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Understanding the impacts of livestock grazing on wildlands is important for making appropriate ecosystem management decisions. Using livestock exclosures, we examined the effects of moderate cattle grazing on the abundance of California ground squirrels (Spermophilus beecheyii Richardson) and the spatial distribution of active burrows within their colonies in grassland and blue oak (Quercus douglasii Hook. & Arn.) savanna habitats in the coastal range of California over a 3-year period (1991-1994). Overall, relative population densities of California ground squirrels declined significantly throughout the experiment, but did not differ between grazed and ungrazed colonies or between habitats. There was also no significant interaction between these 2 factors. The spatial distribution of burrows, as measured by the mean nearest neighbor distance of active entrances within a colony, did not differ significantly between grazed and ungrazed colonies or between habitats, nor was the interaction significant. Thus, low to moderate levels of cattle grazing did not appear to have a strong effect on the population dynamics of California ground squirrels, and grazing may be compatible with maintenance of ground squirrel populations. Based on multivariate analysis of variance of 1994 data, live plant cover, native plant cover, and standing biomass were lower where the number of burrows was higher on grazed colonies but were little affected on ungrazed colonies. Ground squirrels may increase the impact of livestock grazing and thus reduce the capacity of the land to support other activities. However, it is clear that the effects of livestock grazing are complex and that detailed studies of potential mechanisms by which grazing impacts California ground squirrel populations are necessary.

Original languageEnglish (US)
Pages (from-to)352-359
Number of pages8
JournalRangeland Ecology and Management
Volume58
Issue number4
DOIs
StatePublished - Jul 2005
Externally publishedYes

Fingerprint

Spermophilus
squirrels
livestock
grazing
Quercus douglasii
burrow
burrows
ground cover plants
cattle
habitat
habitats
grounds maintenance
spatial distribution
ecosystem management
effect
multivariate analysis
variance analysis
savanna
savannas
population density

Keywords

  • Burrow patterns
  • California grasslands
  • Cattle grazing
  • Oak savanna

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology

Cite this

The effects of livestock on California ground squirrels (Spermophilus beecheyii). / Fehmi, Jeffrey; Russo, Sabrina E.; Bartolome, James W.

In: Rangeland Ecology and Management, Vol. 58, No. 4, 07.2005, p. 352-359.

Research output: Contribution to journalArticle

Fehmi, Jeffrey ; Russo, Sabrina E. ; Bartolome, James W. / The effects of livestock on California ground squirrels (Spermophilus beecheyii). In: Rangeland Ecology and Management. 2005 ; Vol. 58, No. 4. pp. 352-359.
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