Global Patterns of the Fungal Pathogen Support Conservation Urgency.

The amphibian chytrid fungus () is a skin pathogen that can cause the emerging infectious disease chytridiomycosis in susceptible species. It has been considered one of the most severe threats to amphibian biodiversity. We aimed to provide an updated compilation of global occurrences by host taxon and geography, and with the larger global dataset we reanalyzed associations with environmental metrics at the world and regional scales. We also compared our data compilation with a recent independent assessment to provide a more comprehensive count of species and countries with occurrences. has been detected in 1,375 of 2,525 (55%) species sampled, more than doubling known species infections since 2013. occurrence is known from 93 of 134 (69%) countries at this writing; this compares to known occurrences in 56 of 82 (68%) countries in 2013. Climate-niche space is highly associated with detection, with different climate metrics emerging as key predictors of occurrence at regional scales; this warrants further assessment relative to climate-change projections. The accretion of occurrence reports points to the common aims of worldwide investigators to understand the conservation concerns for amphibian biodiversity in the face of potential disease threat. Renewed calls for better mitigation of amphibian disease threats resonate across continents with amphibians, especially outside Asia. As appears to be able to infect about half of amphibian taxa and sites, there is considerable room for biosecurity actions to forestall its spread using both bottom-up community-run efforts and top-down national-to-international policies. Conservation safeguards for sensitive species and biodiversity refugia are continuing priorities.