Predicting & Restoring Future Ecosystems
In 2019, CSIRO's BioEcon model projected that if Queensland land clearing continues at current rates of 400,000 hectares per year, koala populations will fall below minimum viable population size (fewer than 100 individuals per sub-population) in 80% of current habitat by 2050. The model used Lotka-Volterra equations combined with empirical survival data to make this quantitative prediction — converting biological field data into actionable conservation targets. This is the frontier of ecosystem management: using models to predict where biodiversity will be lost, so intervention can happen before it does.
Suppose a national park manager wants to know which animals will be at risk in 50 years, and how to repair an area already damaged by clearing and weeds.
Before reading: how could scientists predict future risks to biodiversity, and what actions could be taken to restore a damaged ecosystem?
Know
- Models humans use to predict future impacts on biodiversity
- Practices used to restore damaged ecosystems
- How Aboriginal peoples care for Country (incl. cultural burning, TEK)
Understand
- How models use data to forecast biodiversity change
- Why restoration rebuilds habitat, species and connections
- Why Traditional Ecological Knowledge is valuable for management
Can Do
- Select appropriate restoration practices for a scenario
- Explain the benefits of cultural burning
- Evaluate the use of models, and restoration vs prevention
Core Content
Using data to forecast what's coming
In 2019, CSIRO's BioEcon model used Lotka-Volterra equations and empirical koala survival data to project that if Queensland land clearing continues at 400,000 hectares per year, koala populations will fall below minimum viable size (fewer than 100 individuals per sub-population) in 80% of current habitat by 2050. The model did not predict the future with certainty — it produced a conditional forecast: if [land clearing rate] continues, then [population outcome] will result. That conditionality is what makes models useful: they translate current data into decision points before damage becomes irreversible.
A model is a simplified representation of a system used to predict its behaviour. Scientists use models to predict future impacts on biodiversity under different scenarios (e.g. levels of warming or land clearing).
Examples used in ecosystem management:
- Climate models — project future temperature and rainfall, the backdrop for biodiversity change.
- Species distribution models — predict where a species could live as conditions shift, identifying future refuges and range shifts.
- Population viability analysis — estimates a population's extinction risk under different threats and management options.
Models let managers test "what if" scenarios and plan ahead — for example, designing habitat corridors so species can move to suitable areas as the climate changes.
Pause — copy the highlighted points into your book before the check below.
A model that predicts where a species could live under future climate conditions is a species _____ model.
Active practices to rebuild ecosystems
We just saw how models predict future risks. That raises a question: what do we actually do about ecosystems already damaged? This card answers it → active restoration practices.
Ecosystem restoration actively repairs damaged ecosystems so they can recover their structure, species and function.
Common restoration practices:
- Revegetation / bush regeneration — replanting native species to rebuild habitat and stabilise soil.
- Removing invasive species — controlling weeds and feral animals that outcompete or prey on natives.
- Reintroduction / translocation — returning native species (sometimes from captive-breeding programs) to restore lost roles, including keystone species.
- Restoring processes — re-establishing water flows, fire regimes or removing barriers (e.g. fish ladders) so the ecosystem can function.
Restoration rebuilds habitat (revegetation), reduces threats (removing invasives), and returns lost species and processes (reintroduction, restoring flows/fire). High biodiversity and connected habitats make restored ecosystems more resilient.
Add the four restoration practices to your notes before the check below.
Which of these is an ecosystem restoration practice?
Designing a Restoration Plan
Pattern — Apply & Justify
A degraded bushland reserve has: dense lantana (invasive weed), feral foxes preying on native animals, eroded creek banks, and a locally extinct native marsupial. In your book, design a restoration plan:
- Name one restoration practice for each problem above (4 practices total).
- Justify why each practice addresses that specific problem.
- Explain why restoring connectivity (e.g. a wildlife corridor) would improve long-term resilience.
- Suggest how a model could help decide where to focus restoration effort.
Tens of thousands of years of managing Country
We just saw modern restoration practices. That raises a question: who has the longest record of successfully managing Australian ecosystems? This card answers it → Aboriginal and Torres Strait Islander peoples, caring for Country.
Aboriginal peoples have actively managed Australian ecosystems for over 60,000 years, and that knowledge is increasingly central to ecosystem management today.
Cultural (cool) burning: frequent, low-intensity, patchy burning reduces fuel loads (lowering the risk of intense megafires), triggers new growth, and creates a mosaic of habitats that supports biodiversity. Modern fire agencies now partner with Traditional Owners to use it.
Traditional Ecological Knowledge (TEK): place-based knowledge built over tens of thousands of years of observing and managing Country — including seasonal calendars, sustainable harvest, and the protection of totem species — that complements scientific data.
Caring for Country sees people as part of the ecosystem, with responsibilities to maintain its health — a holistic approach that aligns strongly with modern restoration and conservation goals.
Add cultural burning, TEK and Caring for Country to your notes.
Cultural (cool) burning reduces fuel loads and creates habitat mosaics that support biodiversity.
Models help managers test "what if" scenarios and plan before biodiversity is lost.
Ecosystem restoration can fully and quickly reverse any damage, including bringing back extinct species.
Evaluating Approaches to Future Ecosystems
Pattern — Analyse & Evaluate
Answer in your book:
- Explain how cultural burning can prevent the kind of catastrophic megafire that damages ecosystems.
- Compare prediction (models) and restoration as approaches: what does each contribute to managing future ecosystems?
- Evaluate the statement: "We can rely on restoration, so preventing damage is unnecessary." Use specific reasons.
- Identify one limitation of relying on models to predict future biodiversity impacts.
Predicting (models)
- Models = simplified systems used to predict biodiversity impacts.
- Climate models, species distribution models, population viability analysis.
- Test scenarios & plan ahead; outputs carry uncertainty.
Restoring
- Revegetation, remove invasives, reintroduction/translocation, restore processes.
- Rebuilds habitat, species & function; connectivity = resilience.
- Partial/slow/costly — prevention is better than cure.
Caring for Country
- Cultural (cool) burning — reduces fuel, supports biodiversity.
- Traditional Ecological Knowledge (TEK) — 60,000+ years of managing Country.
- Holistic; now partnered with modern management.
A fresh set drawn from this lesson's question bank — feedback shown immediately. +5 XP per correct · +25 XP all correct
Pick your answer, then rate your confidence — that tells the system what to drill next.
UnderstandBand 3(3 marks) 1. Identify two practices used to restore damaged ecosystems and explain how each helps an ecosystem recover.
1 mark per practice correctly explained (max 2) · 1 mark: clear link to ecosystem recovery
ApplyBand 4(4 marks) 2. Explain how Aboriginal cultural burning benefits ecosystems, and how models could be used alongside it to manage fire-prone landscapes.
up to 2 marks: cultural burning benefits (fuel reduction, mosaic, biodiversity) · 1 mark: role of models · 1 mark: how the two complement each other
EvaluateBand 5(4 marks) 3. Evaluate the relative value of predicting future impacts (models) versus restoring damaged ecosystems for protecting biodiversity. Include the limitations of each.
up to 2 marks: value + limitation of models · up to 2 marks: value + limitation of restoration + judgement
Show all answers
Multiple choice
MC answers and full explanations are shown inline as you complete each question. Use the retry button to attempt a fresh set from the lesson bank.
Short Answer Model Answers
Q1 (3 marks): Revegetation (bush regeneration) involves replanting native species; this rebuilds habitat and food sources for native animals, stabilises soil to reduce erosion, and re-establishes the vegetation structure the ecosystem depends on, allowing it to recover. Removing invasive species (controlling weeds and feral animals) reduces competition and predation on native species, so native populations can recover and the natural balance of the ecosystem is restored. Both practices directly address causes of degradation, helping the ecosystem rebuild its structure and function.
Q2 (4 marks): Aboriginal cultural ("cool") burning uses frequent, low-intensity, patchy fires that reduce fuel loads, which lowers the risk of intense, destructive megafires; it also stimulates new growth and creates a mosaic of habitats at different stages, supporting greater biodiversity. Models could be used alongside this by predicting fire risk, the effect of different burning regimes, and how vegetation and species will respond under future climate scenarios. The two complement each other: Traditional Ecological Knowledge provides tens of thousands of years of place-based, tested practice, while models allow managers to plan, test scenarios and target burning effort — combining long-term practical knowledge with predictive tools.
Q3 (4 marks): Predicting future impacts with models is valuable because it lets managers anticipate threats and plan ahead (e.g. corridors, refuges) before biodiversity is lost — but models are limited because they simplify complex systems, rely on assumptions and incomplete data, and future drivers are uncertain, so outputs are estimates rather than guarantees. Restoring damaged ecosystems is valuable because it actively repairs habitat, removes threats and returns lost species and processes — but it is limited because it is often partial, slow and expensive, and cannot recover extinct species or perfectly rebuild complex relationships. Overall, the most effective strategy combines both with prevention: use models to anticipate and avoid damage where possible, and use restoration to repair damage that has already occurred — recognising that preventing loss is generally cheaper and more reliable than repairing it.
Timed questions on prediction models, restoration practices and Caring for Country. Beat the boss to bank a tier — gold (perfect + fast), silver (80%+), or bronze (cleared).
⚔ Enter the arenaCSIRO's 2019 BioEcon model predicted that koala populations will fall below minimum viable size in 80% of current habitat by 2050 if land clearing continues at 400,000 hectares per year. This is a model prediction: conditional, quantitative, and actionable. It uses Lotka-Volterra population dynamics applied to empirical survival data. The model's value is not that it is certain — it is that it identifies where intervention can prevent irreversible loss before it occurs.
For 60,000 years, Aboriginal peoples managed Country using cultural burning, maintaining habitat diversity that now requires expensive, technology-dependent management to replicate. The CSIRO model and Traditional Ecological Knowledge converge on the same conclusion: prevention guided by good prediction, informed by deep ecological knowledge, is more effective than restoration after damage has occurred.