In the realm of environmental management, the delicate balance between fire prevention and wildlife conservation is a tightrope walk. The practice of prescribed burning, intended to reduce wildfire risk, has long been a cornerstone of bushfire mitigation strategies in Australia. However, a recent study from Adelaide University challenges the assumption that these burns have minimal impact on wildlife. The research, published in the Australian Journal of Zoology, reveals a startling truth: the evidence of animal deaths can vanish within days of prescribed burns, significantly skewing our understanding of the true toll on Australia's unique fauna.
The study, led by Dr. Shawn Scott, focused on prescribed burns in the Mount Lofty Ranges. The findings were eye-opening: over half of the lizard carcasses detected were found just 28 hours after the fire, and within 12 days, every carcass had disappeared, most likely removed by scavengers. This rapid disappearance of evidence suggests that current post-fire monitoring practices may be missing the immediate impact of prescribed burning on small animals.
Dr. Scott emphasizes the critical importance of timing in wildlife surveys. "Conducting surveys immediately after fire is essential if we want an accurate picture of how many small animals are being killed by prescribed burns," he said. "If people allow days or weeks to pass before surveying, they risk dramatically underestimating the number of animals killed. That can bias our understanding of how fire affects biodiversity and animal welfare."
The research examined 10 prescribed burns across southern Australian eucalypt forests between 2022 and 2024. Researchers recorded 27 dead lizards from four species, with 52% discovered during surveys undertaken just over a day after the fires were extinguished. No dead reptiles were found before burning or more than 12 days afterwards. This pattern suggests that scavengers, including birds, foxes, cats, and invertebrates, rapidly remove carcasses from recently burnt landscapes, making later surveys an unreliable indicator of small animal deaths.
The implications of this study are far-reaching. While the research focused on lizards, the findings are likely to apply to many other small animals. Dr. Scott notes, "Our recommendation to do wildlife surveys immediately after prescribed burns will likely improve our understanding of other animals being killed, including small mammals, frogs, and invertebrates."
Co-author Associate Professor Sophie (Topa) Petit adds, "Prescribed burns kill animals, just like any other fire. It's a fantasy to think that all animals escape and live happily ever after. No matter how 'cool' a fire is, it's still fire."
The study challenges common assumptions about the impacts of prescribed burning. While prescribed burning is widely used to reduce fuel loads and lower bushfire risk, the researchers argue that surprisingly little is known about how many animals die during these operations. Post-fire monitoring is rarely undertaken, and robust data on the ecological costs of prescribed burning are unavailable for most regions of Australia.
Dr. Scott calls for better monitoring to ensure that fire management balances bushfire mitigation with biodiversity conservation. "Post-fire monitoring is rarely undertaken and robust data on how prescribed burning affects wildlife are unavailable for most regions of Australia," he said. "We need more comprehensive data on both the benefits and ecological costs of prescribed burning."
The team hopes the findings will encourage land managers to make rapid wildlife surveys a routine part of prescribed burning programs. By doing so, we can build a more accurate understanding of fire's impact on Australia's unique fauna and ensure that our efforts to prevent wildfires do not come at the expense of our precious wildlife.
In my opinion, this study highlights the critical need for immediate and comprehensive wildlife surveys following prescribed burns. It also underscores the importance of challenging assumptions and re-evaluating our practices to ensure that we are effectively balancing fire prevention with biodiversity conservation. As we continue to grapple with the challenges of climate change and increasing wildfire risk, the insights from this study are a crucial step forward in our understanding of the impact of prescribed burning on Australia's unique fauna.
