ArticlePeerJ2025
Road ecology of a Chihuahuan Desert snake community: size-based mortality sets the stage for evolutionary change in a widespread pitviper.
Article in PeerJ, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Snakes are significant predators in many ecosystems, but high rates of road mortality threaten to diminish their ecological contributions. Documenting species-specific and demographic patterns of road use is crucial for understanding potential impacts, information that can be leveraged for implementing mitigation measures. I investigated the road ecology of a snake community in the Chihuahuan Desert of southern New Mexico, USA. Nocturnal road-cruising surveys were performed three times per month from April to November 2017 along a 37-km stretch of road, which produced 101 snake encounters of 10 species. On average, 4.2 snakes were encountered per survey with no individuals recaptured, equating to a density of 0.057 snakes per kilometer. Seasonal activity patterns indicated a peak in snake encounters from August through October. Standardized data were combined with opportunistic surveys conducted along the same stretch of road from 2014 to 2016. Overall, road mortality was considerable, with 34% of all snakes found dead-on-road (DOR). Across all species, males and females exhibited similar proportions of DOR while juveniles had a lower DOR rate. The Western Diamondback Rattlesnake (
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