Bold claim: a mysterious fungal disease threatening a beloved Brisbane lizard could rewrite Australia’s reptile story, if left unchecked. Researchers in Queensland are sounding the alarm over Nannizziopsis barbatae, a little-understood fungus that may reshape the health landscape of the nation’s diverse reptile populations.
In a long-term Brisbane study of eastern water dragons, scientists found a single fungal case has spread to roughly half of the Roma Street Parklands population over a decade. Sam Gallagher-Becker, a PhD student at the University of Queensland, explains that this fungus causes skin lesions and lethargy, which can cascade into starvation and death. It attacks the keratin in reptile scales, creating lesions that, in severe cases, can cause limbs or digits to detach. In some instances, flesh dies and the animal deteriorates rapidly, sometimes dying soon after lesions appear. When these dragons are discovered, they are often severely ill, unable to move or feed.
Mr. Gallagher-Becker notes a notable surge in infections two to three years ago, though the number has since stabilized at about half of the Roma Street Parklands group. Yet the reach isn’t confined to a single site or species. The fungus appears across multiple Brisbane reptile populations, and some areas show higher infection levels than the parklands itself. Outbreaks have even been reported as far as Dubbo and Perth.
There are still many unknowns, including the fungus’s origin. Is Nannizziopsis barbatae native to Australia, or was it introduced from elsewhere? If it’s an introduced pathogen, its impacts could be much more severe because local reptiles may lack evolved defenses. “If it’s been introduced, then it’s essentially a new pathogen that they haven’t encountered yet, and that means the effects of it might be a lot worse,” says Gallagher-Becker.
The concern feels almost urgent, especially when compared to other devastating fungal threats. Researchers point to chytrid fungus and white-nose syndrome as cautionary examples—diseases responsible for widespread declines and the possible extinction of numerous species worldwide. In Australia, chytrid has already contributed to the decline of 43 frog species and the possible extinction of seven since its first Brisbane-area detection in 1978.
There are alarming “black zones” where scientists lack data about soil presence of the fungus or reptile infections, which heightens unease. Associate Professor Celine Frere emphasizes the potential impact on Australia’s reptiles. Australia hosts about a thousand reptile species, with 90 percent endemic to the continent. She calls the situation a national emergency: a fungal pathogen capable of killing, lacking a treatment, and threatening most native reptile species, all while we still know so little about it.
Dr. Jodi Rowley of the Australian Museum highlights how wildlife diseases are understudied, particularly in reptiles. The discovery of a new wildlife disease is frightening, and studies like this reveal how significant the threat could be to Australia’s biodiversity. Climate change, extreme weather, and increased wildlife movement are contributing to a rising global tide of fungal diseases. Some researchers warn that fungi can also threaten human populations, underscoring the need for proactive wildlife surveillance to detect and respond to new pathogens—especially those potentially introduced from overseas.
If you’re curious about what this could mean for everyday biodiversity in Australia, the core takeaway is clear: fungi can silently leap between species and regions, and our level of vigilance today shapes the health of ecosystems tomorrow. What steps should researchers, policymakers, and communities take first to monitor, prevent, and mitigate such outbreaks? Share your thoughts below and let’s discuss practical, evidence-based approaches to safeguard Australia’s reptiles and broader biodiversity.
