Starter (10 mins)
Before & After: NZ Landscapes
Display pairs of images showing the same NZ locations before and after human settlement (e.g., Canterbury Plains pre-European vs today, Auckland harbour 1800s vs now).
Discussion Questions:
- What changes do you notice?
- What might have caused these changes?
- Which changes might benefit native wildlife? Which might harm it?
Key Point: Introduce the concept that humans are now the major driver of ecosystem change in NZ.
Lab Investigation (25 mins)
Possum Impact Simulation
Students conduct a hands-on investigation to understand how possums affect native forests:
Setup: Three artificial "forest plots" with different possum density scenarios
- Plot A: No possums (control) - full complement of leaves/flowers
- Plot B: Moderate possum pressure - some browsing damage
- Plot C: High possum pressure - severe browsing damage
Investigation: Students measure "tree health" indicators (leaf cover, flower/fruit production, seedling survival) and calculate biodiversity index for each plot.
Data Analysis: Create graphs showing relationship between possum pressure and forest health.
Lab SheetDigital Simulation (20 mins)
"Predator Free NZ" Interactive Model
Students use an online simulation to explore the effects of different predator control strategies:
Simulation Variables:
- Types of pest control (traps, poison, fencing)
- Scale of control operations (local vs regional)
- Budget constraints and resource allocation
- Time scales (short-term vs long-term effects)
Challenge: Try to achieve "predator free" status for a virtual island within budget and time constraints.
Reflection: What strategies were most effective? What real-world challenges does this highlight?
Launch SimulationExpert Interview (15 mins)
Conservation Professional Guest Speaker
Guest Options: DOC ranger, iwi conservationist, Zealandia guide, or conservation volunteer coordinator
Prepared Questions for Guest:
- What's the biggest threat you deal with in your work?
- What conservation success stories can you share?
- How do you balance different stakeholder interests?
- What role do local communities play in conservation?
- What can young people do to help?
Alternative: If no guest available, use recorded interviews from DOC's YouTube channel or conservation documentaries.
Debate Activity (20 mins)
"Should 1080 be used for pest control?"
Divide class into three groups to debate this controversial conservation issue:
- Pro-1080 Team: Research benefits - effectiveness, cost, native species recovery
- Anti-1080 Team: Research concerns - environmental impacts, animal welfare, alternative methods
- Judges/Public: Research the issue and ask questions to both sides
Debate Format: 5 min preparation, 3 min opening statements each, 5 min rebuttals, 2 min closing arguments
Learning Focus: Understanding multiple perspectives and complexity of conservation decisions
Debate GuideTe Ao Māori Perspective: Kaitiakitanga in Action
Te Ara's entry on kaitiakitanga describes it as "a way of managing the environment, based on the Māori world view", and lists traditional practices that helped people care for the environment when hunting, fishing, growing or finding food (Te Ara: Kaitiakitanga – guardianship and conservation):
- Rāhui: "temporary bans (rāhui) on taking food from an area" — Te Ara's rāhui page describes a rāhui as "a restriction that sets aside an area and bans the harvesting of resources", so that "a lake or a forest might be temporarily off-limits so the fish, birds or plants can be restored" (Te Ara: Rāhui – prohibitions)
- Timing the harvest: "using the lunar calendar (maramataka) to decide when to plant and harvest" and "using bird snares at the right time – for example, not when the birds were breeding"
- Taking only what was needed: "hunting and fishing only for food, not as sport"
- Kaitiaki: "A kaitiaki is a guardian. This can be a person or group that cares for an area such as a lake or forest. They are given that role by the local iwi."
These practices differ between iwi and hapū and between rohe — the Te Ara examples above are documented cases, not a description of all Māori conservation.
Modern Examples:
- Taupō Waters: "In 1992, under the leadership of Ariki Sir Hepi Te Heuheu, the Crown returned Taupō Waters to the Trust Board on behalf of and for the benefit of present and future generations of Ngāti Tūwharetoa"; the 2007 Deed "reaffirmed that the Trust Board has full ownership rights of Taupō Waters" (source: tuwharetoa.co.nz, Our History).
- Waikato River: the Waikato-Tainui Raupatu Claims (Waikato River) Settlement Act 2010 established the Waikato River Authority, "the co-governance body established under the Waikato River settlement legislation", "made up of 10 members, with five representatives appointed by river iwi and five by the Crown"; its "primary role is to restore and protect the health and wellbeing of the Waikato River" (source: waikatoriver.org.nz, Our History).
- Whale Watch Kaikōura: a nature-based tourism company "owned and operated by the indigenous Ngāti Kuri people of Kaikōura, a Māori sub-tribe of the South Island's larger Ngāi Tahu Tribe", which keeps "detailed records … for each trip, covering personalised identification of every whale seen, its location and any unusual whale behaviour" (source: whalewatch.co.nz, Ko wai tātou / Who We Are; Kaitiakitanga / Conservation).
- Iwi and DOC: section 4 of the Conservation Act 1987 says the Act "shall so be interpreted and administered as to give effect to the principles of the Treaty of Waitangi" (source: doc.govt.nz, NZCA Giving effect to section 4 of the Conservation Act 1987), and DOC states it "is proud to collaborate with iwi, communities and businesses across Aotearoa to support conservation projects that protect our unique biodiversity" (source: doc.govt.nz, About us).
Discussion: How can traditional approaches complement modern conservation science?
🪶 Kaiako — mātauranga note. Naming iwi correctly is part of the teaching: Taupō Waters were returned to the Tūwharetoa Māori Trust Board for Ngāti Tūwharetoa; the Waikato River Authority is a co-governance body of river iwi and the Crown set up under the Waikato-Tainui river settlement. Before teaching, check whether your local iwi or hapū have conservation mahi you can name here instead — a local example, correctly attributed, carries more weight than any national one.
Case Study: Zealandia Ecosystem Restoration
Background: 225-hectare fenced sanctuary in Wellington that demonstrates ecosystem restoration in action.
Student Investigation Tasks:
- Research the "before" state - what was Zealandia like before restoration?
- List the key restoration techniques used (fencing, pest control, replanting, species reintroduction)
- Document success stories - which species have returned?
- Identify ongoing challenges and management needs
- Calculate the costs and benefits of the project
- Evaluate: Could this model work elsewhere in NZ?
Extension: Virtual field trip using Zealandia's online resources and webcams.
Practical Investigation
Invasive Species Impact Modelling
Students model how quickly invasive species can spread and impact ecosystems:
Equipment: Grid paper, coloured counters, calculators, timer
Method:
- Set up 10x10 grid representing forest ecosystem
- Place green counters for native plants, blue for water, brown for soil
- Introduce red counters (invasive species) at random starting points
- Each "year" (round), invasive species spread to adjacent squares
- Native species are displaced where invasives establish
- Track changes over 10 "years" and graph results
Variables to test: Different starting numbers of invasives, introduction of control measures, presence of natural barriers.
Assessment Task
Conservation Action Letter
Task: Write a persuasive letter (400 words) to the Department of Conservation advocating for action on a specific conservation issue of your choice.
Requirements:
- Issue identification: Clearly describe the conservation problem
- Evidence: Use scientific data to support your concerns
- Impact analysis: Explain consequences if no action is taken
- Proposed solution: Suggest specific, realistic actions
- Multiple perspectives: Acknowledge different stakeholder viewpoints
- Call to action: Request specific response from DOC
Assessment Focus: Scientific reasoning, persuasive writing, understanding of conservation complexity
Letter Template View RubricCurrent Conservation Issues
Kauri Dieback Disease
Fungal disease threatening ancient kauri forests. Students research prevention strategies and cleaning protocols.
Marine Plastic Pollution
Impact on seabirds and marine mammals. Connection to waste management and consumer choices.
Climate Change Effects
Rising sea levels affecting coastal species, changing temperatures impacting alpine ecosystems.
Urban Development Pressure
Habitat loss in growing cities. How can urban planning better protect biodiversity?
Resources Needed
- DOC website and YouTube channel
- Predator Free NZ simulation
- Zealandia online resources
- 1080 debate resource materials
- Conservation project case studies
- Before/after landscape photographs
- Possum impact demonstration materials
- Grid paper and coloured counters
- Calculators and timers
- Guest speaker technology setup
Teacher Notes
- Controversial Topics: 1080 debate can be emotional. Emphasise evidence-based arguments and respectful discussion.
- Guest Speaker Backup: Have recorded content ready if live guest unavailable. Contact DOC education team well in advance.
- Local Connections: Research specific conservation issues in your local area to make content more relevant.
- Positive Focus: Balance discussion of problems with success stories to avoid overwhelming students.
- Action Orientation: Emphasise what students can do, not just problems they can't solve.
- Cross-curricular: Strong links to Social Studies (environmental policy), English (persuasive writing), Mathematics (data analysis).
Where this goes next
This lesson ends on the damage. What it looks like to reverse some of it is Lesson 5's media anchor — Turning the Tide | Mātauranga-led Restoration (RNZ) — so the clip is not shown twice here. Hold these two questions and answer them against that clip when you reach it.
- What tension between human activity and ecosystem health did this lesson make visible?
- Which of the impacts you listed today does the restoration work in Lesson 5 actually address, and which does it not touch?
Curriculum alignment
Quoted verbatim from the live Te Mātaiaho curriculum. The possum-impact lab, Zealandia case study and 1080 debate teach each of these directly.
- Te Mātaiaho (2025) · Science · Phase 4 · Ecosystems — Practices: "Interpreting data (e.g. graphs, maps) to evaluate how human activity (e.g. agriculture, resource extraction) influences ecosystem stability and biodiversity"
- Te Mātaiaho (2025) · Science · Phase 4 · Ecosystems — Practices: "Researching interventions that address specific ecosystem disruptions, using case studies or local examples to explore the practicalities and outcomes of different solutions (e.g. conservation strategies, sustainable technologies)"
- Te Mātaiaho (2025) · Science · Phase 4 · Ecosystems — Knowledge: "Human activity can alter environments faster than some species can adapt, leading to biodiversity loss."
📋 Kaiako Planning Snapshot
Teacher planning support for this resource — learning intentions, success criteria, and inclusive practice guidance are summarised below.
Inclusion Guidance
- ESOL / ELL learners: Pre-teach key vocabulary (human, impact, conservation) using visual word walls or bilingual glossaries before the lesson. Reduce language load with diagrams and visual models. Partner-share and think-pair-share strategies encouraged.
- Neurodiverse learners / ADHD: Break the lesson into clear segments with visual checkpoints. UDL principle: offer ākonga a choice in how they demonstrate understanding (verbal, written, visual/drawn). Provide anchor charts or reference cards for lesson 4 concepts throughout.
- Dyslexia: Provide audio-text alternatives for written materials. Use high-contrast fonts and generous line spacing. Allow voice recording as an alternative to written responses where possible.