Thamnophis sirtalis 

Scope: Global
Status_ne_offStatus_dd_offStatus_lc_onStatus_nt_offStatus_vu_offStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Reptilia Squamata Natricidae

Scientific Name: Thamnophis sirtalis
Species Authority: (Linnaeus, 1758)
Common Name(s):
English Common Gartersnake

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2015
Date Assessed: 2007-03-03
Assessor(s): Frost, D.R., Hammerson, G.A. & Santos-Barrera, G.
Reviewer(s): Cox, N.A., Chanson, J.S. & Stuart, S.N.
Justification:
Listed as Least Concern in view of its extremely wide distribution, presumed large population, and because populations are unlikely to be declining.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The species' wide range includes much of North America, from southeastern Alaska, British Columbia, southern Northwest Territories, northern Saskatchewan, central Manitoba, Ontario, central Quebec, and the Maritime Provinces of Canada, to southern California, central Utah, northeastern Colorado, New Mexico, and Chihuahua (Mexico) (disjunct), Texas, Gulf Coast, and southern Florida (Conant and Collins 1991, Ernst and Ernst 2003, Stebbins 2003). There is a very small population in northwestern Chihuaha, Mexico.
Countries occurrence:
Native:
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 a very large number of occurrences (subpopulations) (Fitch 1980). Many occurrences have good viability. The total adult population size is unknown but probably exceeds 1,000,000. Long-term extent of occurrence, area of occupancy, number of subpopulations, and population size have probably been relatively stable. Currently, extent of occurrence, area of occupancy, number of subpopulations, and population size are probably relatively stable or declining at a low rate.
Current Population Trend:Stable
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Throughout the range, this species inhabits a very wide range of aquatic, wetland, and upland habitats; habitat preference exhibits rather pronounced regional differences (e.g., east vs. west). When inactive, it occurs underground, in or under surface cover, or in other secluded sites.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): No major threats have been identified. The Mexican population is vulnerable to changes in hydrology.

Conservation Actions [top]

Conservation Actions: Many occurrences of this species are in areas that afford adequate protection.

Classifications [top]

1. Forest -> 1.1. Forest - Boreal
suitability:Marginal  
1. Forest -> 1.4. Forest - Temperate
suitability:Suitable  
2. Savanna -> 2.2. Savanna - Moist
suitability:Suitable  
3. Shrubland -> 3.4. Shrubland - Temperate
suitability:Suitable  
4. Grassland -> 4.4. Grassland - Temperate
suitability:Marginal  
5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)
suitability:Suitable  
5. Wetlands (inland) -> 5.2. Wetlands (inland) - Seasonal/Intermittent/Irregular Rivers/Streams/Creeks
suitability:Suitable  
5. Wetlands (inland) -> 5.3. Wetlands (inland) - Shrub Dominated Wetlands
suitability:Suitable  
5. Wetlands (inland) -> 5.4. Wetlands (inland) - Bogs, Marshes, Swamps, Fens, Peatlands
suitability:Suitable  
5. Wetlands (inland) -> 5.5. Wetlands (inland) - Permanent Freshwater Lakes (over 8ha)
suitability:Suitable  
5. Wetlands (inland) -> 5.6. Wetlands (inland) - Seasonal/Intermittent Freshwater Lakes (over 8ha)
suitability:Suitable  
5. Wetlands (inland) -> 5.7. Wetlands (inland) - Permanent Freshwater Marshes/Pools (under 8ha)
suitability:Suitable  
5. Wetlands (inland) -> 5.8. Wetlands (inland) - Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha)
suitability:Suitable  
5. Wetlands (inland) -> 5.9. Wetlands (inland) - Freshwater Springs and Oases
suitability:Suitable  
14. Artificial/Terrestrial -> 14.2. Artificial/Terrestrial - Pastureland
suitability:Marginal  
14. Artificial/Terrestrial -> 14.4. Artificial/Terrestrial - Rural Gardens
suitability:Suitable  
15. Artificial/Aquatic & Marine -> 15.2. Artificial/Aquatic - Ponds (below 8ha)
suitability:Suitable  
15. Artificial/Aquatic & Marine -> 15.3. Artificial/Aquatic - Aquaculture Ponds
suitability:Suitable  
15. Artificial/Aquatic & Marine -> 15.7. Artificial/Aquatic - Irrigated Land (includes irrigation channels)
suitability:Suitable  
15. Artificial/Aquatic & Marine -> 15.8. Artificial/Aquatic - Seasonally Flooded Agricultural Land
suitability:Marginal  
15. Artificial/Aquatic & Marine -> 15.9. Artificial/Aquatic - Canals and Drainage Channels, Ditches
suitability:Suitable  

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education

Bibliography [top]

Conant, R. and Collins, J.T. 1991. A Field Guide to Reptiles and Amphibians: Eastern and Central North America. Third Edition. Houghton Mifflin Company, Boston, Massachusetts.

Ernst, C.H. and Ernst, E.M. 2003. Snakes of the United States and Canada. Smithsonian Books, Washington, D.C.

Fitch, H.S. 1980. Thamnophis sirtalis. Catalogue of American Amphibians and Reptiles 270: 1-4.

IUCN. 2015. The IUCN Red List of Threatened Species. Version 2015.2. Available at: www.iucnredlist.org. (Accessed: 23 June 2015).

Rossman, D.A., Ford, N.B. and Seigel, R.A. 1996. The Garter Snakes. University of Oklahoma Press, Norman, Oklahoma and London, UK.

Stebbins, R.C. 2003. A Field Guide to Western Reptiles and Amphibians. Third Edition. Houghton Mifflin Company, Boston, Massachusetts.


Citation: Frost, D.R., Hammerson, G.A. & Santos-Barrera, G. 2015. Thamnophis sirtalis. In: The IUCN Red List of Threatened Species 2015: e.T62240A68308267. . Downloaded on 25 September 2016.
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