Invasive Species Cost Australia $24.5B: How to Respond 2026

Invasive species are an evolving threat that costs Australia an estimated $24.5 billion every year, and how we respond is crucial for protecting biodiversity and agriculture. From feral pigs on Kangaroo Island to invasive weeds and wild deer, the challenge demands science-driven, predictive approaches.

The Economic and Ecological Toll of Invasive Species

According to research by Professor Corey Bradshaw at Flinders University, invasive species have cost Australia at least $390 billion over the past 60 years. These pests and weeds are not just an economic burden—they are a primary driver of extinction, responsible for 60% of recorded global animal and plant extinctions, as reported by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services in 2023.

On Kangaroo Island, the 2019-20 bushfires wiped out an estimated 90% of the feral pig population, creating a rare window for eradication. Landholders and researchers used predictive modeling to remove the survivors, achieving a world-first success in an area that large. This case demonstrates that with the right tools and collaboration, even seemingly impossible biosecurity goals are attainable.

How Predictive Modeling Transforms Biosecurity

Bradshaw's research shows that modeling can turn biosecurity from a reactive to a predictive system. By projecting the effort, cost, and timeframe needed for eradication, decision-makers can allocate resources effectively. This approach is adaptable to other threats, including invasive weeds and wild deer.

Why Early Action Matters

Delaying response to invasive species allows populations to rebound, making eradication more costly or impossible. The Kangaroo Island success was possible because action came swiftly after the fires. Without modeling, the effort would have been under-resourced and likely failed.

Key Takeaways for Policymakers and Landholders

• Invest in predictive modeling to estimate costs and timelines before starting eradication programs.
• Prioritize early intervention—acting quickly after a disturbance can prevent rebound.
• Foster collaboration between researchers, government, and local communities.
• Secure long-term funding; invasive species management requires sustained commitment.
• Monitor and adapt strategies based on real-time data.

FAQ: Invasive Species Management