|Black-tailed Rattlesnake, Crotalus molossus. JCM|
In a second study done in Brazilian rainforest, over a shorter period of time Hartman et al (2011) sampled a 16 km tract of a paved road from October, 2001 to December, 2002, totaling 5,173 km. The most commonly found species were Chironius exoletus, C. bicarinatus, Oxyrhopus clathratus, and Chironius fuscus. They found 60 road killed snakes (0.0115 snakes per km), belonging to 15 species, representing about 58% of the species recorded for the region. Hartman et al. suggest the more mobile species seemed are more vulnerable to road mortality than sedentary species because species encountered dead on the road tended to be active foragers and show plasticity in microhabitat use. The high number of juveniles found in May could reflect juvenile recruitment. The increased road mortality in October may result from males searching females during the mating period.
Hartmann, P. A. et al. 2011. Snake Road Mortality in a Protected Area in the Atlantic Forest of Southeastern Brazil. South American Journal of Herpetology 6(1):35-42.
Jones, T. R. et al. 2011. Sonoran desert snake communities at two sites: concordance and effects of increased road traffic. Herpetological Conservation and Biology 6:61-71.