Data S2. CMR data from: Measuring the fitness advantage conferred by autotomy in the wild

Data S2. CMR data. The composition is summarized in tables S2, S3, and
S10. Autotomy, the self-amputation of body parts, serves as an
anti-predator defense in many taxonomic groups of animals. However, its
adaptive value has seldom been quantified. Here, we propose a novel
modeling approach for measuring the fitness advantage conferred by the
capability for autotomy in the wild. Using a predator-prey system where a
land snail autotomizes and regenerates its foot specifically in response
to snake bites, we conducted a laboratory behavioral experiment and a
3-year multi-event capture–mark–recapture (CMR) study. Combining these
empirical data, we developed a hierarchical model and estimated the basic
life history parameters of the snail. Using samples from the posterior
distribution, we constructed the snail’s life table as well as that of a
snail variant incapable of foot autotomy. As a result of our analyses, we
estimated the monthly encounter rate with snake predators at 3.3% (95% CI:
1.6–4.9%), the contribution of snake predation to total mortality until
maturity at 43.3% (15.0–95.3%), and the fitness advantage conferred by
foot autotomy at 6.5% (2.7–11.5%). This study demonstrated the utility of
the multi-method hierarchical modeling approach for the quantitative
understanding of the ecological and evolutionary processes of
anti-predator defenses in the wild.