author={Dirk J. Stevenson and Karen Jane Dyer and Beth A. Willis-Stevenson},
Abstract We studied the federally threatened eastern indigo snake (Drymarchon couperi) from 1992 to 2002 in southeastern Georgia, including a 4-year markrecapture study conducted on the Fort Stewart Military Reservation. Indigo snakes in this region are sexually dimorphic in size, with males attaining greater maximum lengths. Subadult and small adult snakes grow more rapidly than larger adults. Georgia specimens prey on a variety of vertebrates, including juvenile gopher tortoises (Gopherus… 

Nesting Sites of the Eastern Indigo Snake (Drymarchon couperi) in Georgia

Abstract Little is known about the nesting habits of Drymarchon couperi (Eastern Indigo Snake), a federally threatened species native to the Coastal Plain of the southeastern United States. Here, we

Use of a Novel Refuge Type by Eastern Indigo Snakes (Drymarchon couperi) in Georgia

Abstract We conducted a 14-year mark–recapture study of a population of Drymarchon couperi (Eastern Indigo Snake) inhabiting an unusual geologic region (Altamaha Grit) embedded within the Vidalia


Size data from Fort Stewart and other sites in southeastern Georgia demonstrate that D. couperi exhibits male- biased sexual size dimorphism, and should be encouraged to be monitored at other sites where the species can reliably be found by surveys at Gopher Tortoise burrows.

Prey Records for the Eastern Indigo Snake (Drymarchon couperi)

Data confirm that Eastern Indigo Snakes eat a wide assortment of prey of varying sizes, which allows D. couperi to potentially forage successfully in many different types of habitats and under fluctuating environmental conditions, a valuable trait for a top-level predator that requires a large home range.

Indigo snake capture methods: effectiveness of two survey techniques for Drymarchon couperi in Georgia

Trapping was most successful during early fall, a period when surveys are often less effective compared to those conducted in late fall through early spring, and a combination of surveys from mid-fall through March in conjunction with trapping is recommended, especially from late-summer through fall in the northern portions of the snake’s range.

Survival of Radio-implanted Drymarchon couperi (Eastern Indigo Snake) in Relation to Body Size and Sex

Results indicated that body size, standardized by sex, was the most important covariate determining survival of adult D. couperi, suggesting lower survival for larger individuals within each sex.

Seasonal Shifts in Shelter and Microhabitat Use of Drymarchon couperi (Eastern Indigo Snake) in Georgia

The results suggest that the availability of suitable underground shelters, especially G. polyphemus burrows, may be a limiting factor in the northern range of D. couperi, with important implications for its conservation.

Survival and population growth of a long-lived threatened snake species, Drymarchon couperi (Eastern Indigo Snake)

It is suggested that protecting adult snakes and their habitats would result in the highest likelihood of long-term population stability and growth.

Effects of body size and sex of Drymarchon couperi (eastern indigo snake) on habitat use, movements, and home range size in Georgia

The federally threatened eastern indigo snake (Drymarchon couperi), native to the southeastern Coastal Plain of the United States, has experienced population declines caused primarily by habitat

Occupancy of Potential Overwintering Habitat on Protected Lands by Two Imperiled Snake Species in the Coastal Plain of the Southeastern United States

This study provides previously lacking population-level detection rates and habitat associations for EIS and corroborates the previously noted importance of Gopher Tortoise burrows as overwintering retreat sites and illustrates the potential shortcomings of monitoring multiple species using survey methodologies designed for a single species.



The Distribution of the Eastern Indigo Snake, Drymarchon corais couperi, in Georgia1

The majority of 511 sightings occurred in the Tifton Uplands of the Georgia Coastal Plain and were associated with deep, excessively drained, sandy soils along major streams.

A Field Guide to Reptiles and Amphibians: Eastern and Central North America

This newly designed field guides features detailed descriptions of 595 species and subspecies. The 656 full-color illustrations and 384 drawings show key details for accurate identification. More

Sexual size dimorphism and male combat in snakes

The hypothesis that large male size is an adaptation to intrasexual competition is supported and both sexual size dimorphism and the incidence of male combat tend to be distributed along taxonomic lines.

“Costs” of reproduction in reptiles

  • R. Shine
  • Biology, Environmental Science
  • 2004
Within the range of annual survivorship rates of most lizard species, trade-offs between fecundity and survival are likely to be the main evolutionary determinants of optimal levels of “reproductive effort”.

Preliminary Evaluation of the Impact of Roads and Associated Vehicular Traffic on Snake Populations in Eastern Texas

Roads and associated vehicular traffic have often been implicated in the decline of snake populations. Radio-telemetry studies have documented vehicle related mortality as a factor in Louisiana pine

The reptiles and amphibians of Alabama