The boreal chorus frog, depicted, was one of several species studied to assess possible interactive effects of the pathogen Bd and the environmental contaminant methylmercury—both widespread threats to amphibians Background Disease and environmental contaminants contribute to  amphibian population declines worldwide. NOROCK scientists have been studying the effects of a particularly destructive amphibian pathogen, amphibian chytrid fungus ( Batrachochytrium dendrobatidis (Bd)), and a potentially lethal environmental pollutant, methylmercury. Bd and methylmercury are widespread across the landscape, so understanding how these threats affect amphibians and interact with each other and the environment can inform management of native amphibians, including habitat restoration strategies.…