Documents & Literature
Links to Hansen Biological Consulting and other environmental and natural resources documents:
Peer Reviewed Articles
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Hansen, E.C., Scherer, R.D. et al. Relations between Environmental Attributes and Contemporary Occupancy of Threatened Giant Gartersnakes (Thamnophis gigas) (2017) Journal of Herpetology, 51(2):274-283.
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Wack, R.F., Hansen, E.C., Johnson, C.K., Poppenga, R. Bacterial Flora of the Giant Garter Snake (Thamnophis gigas) and Valley Garter Snake (Thamnophis sirtalis fitchi) in the Central Valley of California (2017) Western Wildlife 4:61-71.
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Wood, D.A., Halstead, B.J., Casazza, M.L., Hansen, E.C., Wylie, G.D, Vandergast, A.G. Defining population structure and genetic signatures of decline in the giant gartersnake (Thamnophis gigas): implications for conserving threatened species within highly altered landscapes (2015) Conservation Genetics 16: 1025.
G. Hansen & J. Brode Technical Documents
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Hansen, G.E. Status of the Giant Garter Snake (Thamnophis gigas) in the San Joaquin Valley (1995).
Hansen, G.E., Brode, J.M. Results of Relocating Canal Habitat of Giant Garter Snake (Thamnophis gigas) During the Widening of State Route 99/70 in Sacramento and Sutter Counties, California (1993).
Brode, J.M., Hansen, G.E. Status and Future Management of The Giant Garter Snake (Thamnophis gigas) Within the Southern American Basin, Sacramento and Sutter Counties, California (1992).
Hansen, G.E. Review of the Status of the Giant Garter Snake (Thamnophis couchi gigas) and It’s Supporting Habitat (1986-1987).
Hansen, G.E. Status of the Giant Garter Snake (Thamnophis couchi gigas) in the Southern Sacramento Valley (1986).
Species Specific Documents
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US Fish and Wildlife Giant Garter Snake (Thamnophis gigas) Final Recovery Plan (2017)
US Fish and Wildlife Giant Garter Snake (Thamnophis gigas) 5 Year Review (2006): Summary and Evaluation
US Fish and Wildlife California Red-legged Frog (Rana aurora draytonii) Recovery Plan