Deadly Fungal Disease Detected in Wild Reptiles Across Australia
In a concerning development for wildlife conservation, three novel fungal pathogens have been identified in skin samples taken from sick reptiles in Australia. This discovery marks the first confirmed reports of such infections in free-ranging wild Australian snakes and other reptile species, raising alarms about potential declines in the country's rich reptilian diversity.
Unprecedented Findings in Queensland Wildlife
The investigation began when a coastal carpet python was admitted to a wildlife hospital in South East Queensland in August 2024. Veterinarians observed damaged scales, crusted lesions, and an unexplained fungal infection. Subsequent skin tests revealed snake fungal disease, caused by Ophidiomyces ophidiicola, an emerging pathogen previously linked to snake population declines overseas.
Researchers analysed skin samples from ten sick reptiles between April 2023 and September 2024, including species such as eastern water dragons, eastern bearded dragons, eastern bandy-bandy snakes, white-crowned snakes, and coastal carpet pythons. The infections ranged from mild to severe, with some cases leading to extreme emaciation, abnormal skin shedding, and necessitating euthanasia due to the animals' deteriorated condition.
Identification of Three Fungal Threats
The study detailed three fungal pathogens from the Onygenaceae family, each presenting new risks:
- Ophidiomyces ophidiicola: Known as snake fungal disease, this was detected for the first time in free-ranging Australian wildlife, affecting three native snake species.
- Nannizziopsis barbatae: Previously identified in Australian lizards, this pathogen was reported globally for the first time in a snake.
- Paranannizziopsis spp.: This marks its first detection in free-ranging Australian wildlife, causing disease in eastern bearded dragons and coastal carpet pythons.
All three infections produce disfiguring skin lesions, with two of them not previously known to impact wild reptiles in Australia.
Vulnerability of Reptiles and Ecosystem Impact
Fungal infections pose a particularly devastating threat to ectothermic (cold-blooded) reptiles and amphibians, as their lower body temperatures allow fungi to thrive. This contrasts with warm-blooded animals, which are generally protected by higher body heat. The situation is exacerbated by climate change, which stresses wildlife and makes them more susceptible to infections while potentially expanding the range of fungal pathogens.
Reptiles play crucial roles in ecosystems, such as controlling pest populations and maintaining landscape health. The loss of species to fungal diseases could have cascading effects on biodiversity, similar to the frog extinctions triggered by chytrid fungus in Australia and globally.
Community Involvement and Conservation Efforts
Early detection of these diseases has been largely driven by observant community members and wildlife enthusiasts who reported sick animals. Public participation is vital for monitoring and managing the spread of these infections. Citizens are encouraged to recognise signs of illness, such as brown or yellow crusty lesions, abnormal shedding, swelling, or lethargy, and report sightings to local wildlife authorities or platforms like iNaturalist.
Additionally, responsible practices are emphasised, including avoiding the release of pet reptiles into the wild, as captive animals can carry pathogens harmful to wild populations. Proper hygiene and permits are advised for authorised handlers to prevent cross-contamination.
Future Research and Implications
The findings suggest a potential hidden crisis in Australian reptile populations. Researchers are now conducting broader surveys to assess the prevalence of these fungal infections, identify at-risk species, and understand environmental factors that favour disease spread. Without intervention, these pathogens could threaten vulnerable species like leaf-tailed geckos, blind snakes, earless dragons, and Nangur spiny skinks, with disastrous consequences for conservation efforts.
Understanding and controlling these emerging fungal diseases will be essential to safeguard Australia's extraordinary reptilian diversity, which is already under pressure from habitat loss, invasive species, and urbanisation.
