Chapter 4-Factors Influencing Viability

The eastern indigo snake was listed under the ESA as threatened in 1978 throughout its range due to population declines caused by habitat modification, over-collecting for the pet trade and mortality from gassing gopher tortoise burrows (USFWS 1978). Based on the eastern indigo snake’s life history and habitat needs (section 2.5 above), we identified the potential negative and positive influencing factors and contributing sources of those influences that are likely to affect current and future species viability (Figure 17). In the following sections we discuss the specific influences most affecting the species.

Factors influencing the viability of the eastern indigo snake.
Figure 17: Factors influencing the viability of the eastern indigo snake. Factors connected by blue arrows have positive relationships. Factors connected by orange arrows have negative relationships. Factors connected by black arrows have neutral or unknown relationships.