Thomomys townsendii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Geomyidae

Scientific Name: Thomomys townsendii (Bachman, 1839)
Common Name(s):
English Townsend's Pocket Gopher
Taxonomic Notes: Limited hybridization with T. bottae occurs in northeastern California. Included in T. umbrinus by Hall (1981). Regarded as a distinct species by Jones et al. (1992), Baker et al. (2003), and Patton (in Wilson and Reeder 1993, 2005). Patton and Smith (1994) examined mtDNA and electrophoretic data for T. bottae and T. townsendii and found a variation pattern that made "strict adherence to any species concept in the objective recognition of evolutionary units within this complex...difficult at best."

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2016-08-18
Assessor(s): Cassola, F.
Reviewer(s): Amori, G.
Contributor(s): Hammerson, G.A. & Linzey, A.
Listed as Least Concern because it has a reasonably large range, it is common, there are no major threats, and it occurs in a few protected areas.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is distributed in disjunct patches in the western United States, in southeastern Oregon, southwestern Idaho, northern Nevada, and northeastern California.
Countries occurrence:
United States (California, Idaho, Nevada, Oregon)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is apparently secure (NatureServe) and can be common in its range.
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species inhabits deep, moist, loamy, alkaline soils found in bottomlands of sagebrush habitats, as well as irrigated fields (Verts and Carraway 2003). Also found in the deep soils of river valleys, or old lake beds; in areas with shadscale vegetation type (M. F. Smith, in Wilson and Ruff, 1999). It is primarily fossorial. Young are born in underground burrows. Adults may produce two or more litters per year, ranging from three to ten young per litter (Ingles 1965). Gestation lasts approximately 19 days.

Pocket gophers are ecologically important as prey items and in influencing soils, microtopography, habitat heterogeneity, diversity of plant species, and primary productivity (Huntly and Inouye 1988). Predators include owls, hawks, foxes, coyotes, etc. Diet includes roots, tubers, and some surface vegetation. Forages from underground burrow and may pull plants down through soil into burrow. Sometimes forages aboveground. Collects food in cheek pouches and carries it to underground storage areas.
Generation Length (years):1-2

Threats [top]

Major Threat(s): There are no known threats to this species.

Conservation Actions [top]

Conservation Actions: This species is not of conservation concern and its range includes a few protected areas.

Errata [top]

Errata reason: This errata assessment has been created because the map was accidentally left out of the version published previously.

Citation: Cassola, F. 2016. Thomomys townsendii (errata version published in 2017). The IUCN Red List of Threatened Species 2016: e.T42598A115193369. . Downloaded on 22 May 2018.
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