Relative survival (95% binomial CI; a) and Proportion of infected frogs (95% binomial CI; b) predicted by Mucosome function.

Post-metamorphosis survival was measured from four Swiss amphibian species after exposure to zoospores of a Swiss Bd isolate, TG 739. Survival curves for each species are presented in Supporting Information (Figs. S2, S3 in File S1) and relative survival was calculated as the proportion of infected frogs surviving/proportion of unexposed control frogs surviving. Alytes obstetricans showed the highest infection and mortality, and Rana temporaria the lowest, with Bombina variegata and Pelophylax esculentus intermediate. All frogs were raised in captivity from egg clutches and had no history of natural exposure to Bd. Mucosome function (mean, SE) indicates Bd viability after exposure to amphibian mucus and is a significant predictor of both survival (binomial logistic regressions, P<0.0001) and infection prevalence (P = 0.0106).