Thamnophis elegans 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Reptilia Squamata Natricidae

Scientific Name: Thamnophis elegans (Baird & Girard, 1853)
Common Name(s):
English Terrestrial Gartersnake, Western Terrestrial Garter Snake

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Needs updating
Assessor(s): Frost, D.R., Hammerson, G.A. & Hollingsworth, B.
Reviewer(s): Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Listed as Least Concern in view of its wide distribution, tolerance of a broad range of habitats, presumed large population, and because it is unlikely to be declining fast enough to qualify for listing in a more threatened category.

Geographic Range [top]

Range Description:The species' range extends from central British Columbia, central Alberta, and southwestern Manitoba in Canada, south through all of the western United States (east to western South Dakota, western Nebraska, Colorado, extreme western Oklahoma, and New Mexico) to (disjunctly) northern Baja California. There are many isolated populations around the margins of the main range (Fitch 1983, Rossman et al. 1996, Grismer 2002, Stebbins 2003), notably in the Sierra Nevada and San Bernardino Mountains of California, and Sierra San Pedro Martir in Baja California (subspecies T. c. hueyi). Its elevational range extends from sea level to 3,995 m asl (13,100 feet) (very rarely); usually below 3,355 m asl (11,000 feet) (Hammerson 1999, Stebbins 2003).
Countries occurrence:
Canada; Mexico; United States
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is represented by hundreds of occurrences or subpopulations (e.g., see maps in Fitch 1983, Degenhardt et al. 1996, and Hammerson 1999). The total adult population size is unknown but certainly exceeds 100,000. This snake is very common in many areas. Its extent of occurrence, area of occupancy, number of subpopulations, and population size are probably relatively stable. The isolated southern populations in California and Baja California are much less abundant.
Current Population Trend:Stable
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species occurs in a wide variety of habitats, from lowlands to high mountains: grassland, shrubland, woodland, rocky hillsides, and open areas in forests. It is chiefly terrestrial in most areas, but also aquatic in some locations (e.g., high Sierra Nevada). Often in inhabits wetlands and areas near streams, ponds, and lakes.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): No major threats are known. In high-elevation areas of the southern Sierra Nevada in California, introductions of non-native trout apparently have led to declines in populations of amphibians and possibly also of T. elegans, which may depend on amphibians as a primary food resource (and which may occasionally serve as prey for trout) (Matthews et al. 2002). However, Matthews et al. (2002) did not discuss the historical distribution of T. elegans in their study areas, so the significance of extensive trout introductions in the absence of garter snakes from some areas (John Muir Wilderness) is uncertain. Further study is warranted (e.g., in the mountains of Colorado, T. elegans is a versatile feeder [Hammerson 1999], and garter snake populations may not rely much on amphibian populations).

Conservation Actions [top]

Conservation Actions: Many occurrences of this species are in protected areas.

Citation: Frost, D.R., Hammerson, G.A. & Hollingsworth, B. 2007. Thamnophis elegans. The IUCN Red List of Threatened Species 2007: e.T63976A12732762. . Downloaded on 25 September 2018.
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