Overview
Research conducted by UCLA biologists has identified an unexpected reservoir for the fungal pathogen Batrachochytrium dendrobatidis (Bd), which impacts Yosemite toad populations. The study indicates that the Bd fungus, previously understood to infect toads primarily through their skin in aquatic settings, is present within the toads' burrows. This finding alters the understanding of how this pathogen interacts with its host environment.
Research Context
The Batrachochytrium dendrobatidis (Bd) fungus has been recognized globally as a factor contributing to the decline of amphibian populations. Historical understanding posited that Bd infected amphibians, such as the Yosemite toad, primarily when they were in water, with the pathogen residing on and infecting through their skin. Yosemite toads are classified as a threatened species. The identification of a specific hiding place for this fungus shifts the established perspective on its environmental presence relative to the host.
Findings
UCLA biologists have determined that the 'silent killer' of Yosemite toads, identified as the Batrachochytrium dendrobatidis (Bd) fungus, resides in the toads' own burrows. This finding challenges the prior assumption that the fungus predominantly lived in and infected toads via their skin while they were in water.
Why This Matters
The discovery that the Bd fungus is present in Yosemite toad burrows provides new insight into the epidemiology of this pathogen. Understanding the full environmental range of Bd is crucial for efforts aimed at mitigating the impact of this fungus on threatened amphibian species, including the Yosemite toad.