Keywords: Alytes obstetricans, genetic diversity, geographic variation, microsatellites, population isolation, population structure, Batrachochytrium dendrobatidis, between and within population variation, body size, chytridiomycosis, disease resistance, metamorphosis, mortality, decline, detection probability, probability, hierarchical model, multi-species site occupancy model, additive and compensatory mortality, count data, population trend, amphibian, disease mitigation, ecological conditions, habitat characteristics, hierarchical Bayesian model, pathogen load, prevalence, zero-inflatio