Appendix B. Full description of methods to reduce metal data prior to analytical modeling of trematode prevalence and diversity and comparisons of metal concentrations at sites to the informal toxicity benchmark: Effect Range Low. AltmanIrit E. ByersJames 2016 Full description of methods to reduce metal data prior to analytical modeling of trematode prevalence and diversity and comparisons of metal concentrations at sites to the informal toxicity benchmark: Effect Range Low.