Fig 5. Probability of quasi-extinction (over a 30-year simulation) vs. the length of the reintroduction (the number of years in which snakes are released) for reintroduced populations of San Francisco gartersnake (Thamnophis sirtalis tetrataenia).

Neonate survival rate in the wild set to A) 0.10, B) 0.20, C) 0.30, or D) 0.40. The four lines in each plot correspond to the life-stage released into the reintroduced population: neonates, juveniles, adults, or mixed age/size-distribution. For all scenarios, ten adult females are kept in captivity or released annually.