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NZ Ecosystems Climate Impact

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NZ Ecosystems Climate Impact

You are helping a coastal and forest restoration team assess how climate change could affect Aotearoa New Zealand’s ecosystems. Read the briefing, inspect the data, and use evidence to recommend practical responses. Climate impacts vary by place; the figures below are a simplified teaching dataset, not official observations.

Briefing: connected changes

Greenhouse gases trap more heat in the Earth system. In Aotearoa, a changing climate can bring warmer air and seas, changing rainfall, more frequent or intense extremes, and sea-level rise. Effects differ between regions and interact with pressures such as habitat loss and introduced species. In a lowland forest, warmer or drier conditions may stress plants and alter flowering, fruiting and food availability. Species may shift their ranges, but native species with small populations or limited ability to move can struggle. In alpine areas, warming reduces the area of cold-adapted habitat. In coastal waters, marine heatwaves can stress kelp; losing kelp can remove shelter and food for many species. Sea-level rise and storms can squeeze wetlands between rising water and built barriers if wetlands cannot move inland. Climate change is not the only cause of ecosystem decline, and an observed change does not by itself prove climate change caused it. Scientists compare long-term observations, consider other causes, and report uncertainty. Kaitiakitanga—active care and responsibility for the natural world—can guide monitoring, restoration and decisions made with mana whenua and communities.

Monitoring snapshot

A restoration group recorded the following simplified teaching data. Each value is the average for a season across a five-year monitoring period. The site records show association, not proof of cause.

Forest site | Mean summer temperature (°C): 18.0 → 19.2 | Days with very low soil moisture per summer: 8 → 17 | Seedling survival (%): 72 → 54

Coastal site | Mean summer sea-surface temperature (°C): 16.0 → 17.1 | Kelp cover (%): 68 → 49 | Small fish sightings per survey: 24 → 16

Wetland site | High-tide water level relative to local benchmark (cm): 0 → 6 | Salt-tolerant plant cover (%): 21 → 34 | Freshwater plant cover (%): 58 → 43

1.Which ecosystem records the largest increase in its listed temperature measure? Calculate the increase and name the site.

2.Select the best-supported interpretation of the forest figures.

The data prove that warming alone caused every seedling to die.
Lower seedling survival occurred alongside warmer, drier conditions; more evidence is needed to identify causes.
The forest became wetter, so seedling survival should rise.
The data show that no forest plants can adapt.

3.Use the monitoring snapshot to give one evidence-based concern for the coastal food web. State a possible link between the measurements without claiming the data prove it.

4.Match each climate pressure to a plausible ecosystem effect. Write the correct letter beside each number.

1. Sea-level rise and coastal barriers
2. Warmer conditions in alpine areas
3. Marine heatwaves

B. Wetland habitat may be squeezed or flooded
A. Cold-adapted habitat may shrink
C. Kelp may be stressed

5.A warm year is followed by a decline in a native bird’s nesting success. Explain why this single observation is not enough to conclude that climate change caused the decline. Name two other factors or kinds of evidence scientists should consider.

6.True or false? If a species moves to a cooler location, climate change cannot affect it further. Explain your choice.

7.Complete the cause-and-effect chain with one sensible link in each gap: warmer, drier summers → → lower seedling survival → possible change in forest habitat and food.

8.Choose the strongest next step for investigating the forest pattern, and explain why it is useful.

Stop monitoring because the figures already prove the cause.
Measure seedling survival and soil moisture at the same plots over many seasons, while recording other relevant conditions.
Count only the largest trees once.
Move all seedlings immediately to a different region.

9.A wetland has a road on one side and rising water on the other. Propose one practical action that could help the wetland and explain how it addresses the pressure. Include mana whenua or community partnership in your proposal.

10.In the monitoring data, salt-tolerant plant cover rose while freshwater plant cover fell. Give one possible explanation and one reason the pattern should be monitored further.

11.Suggest two complementary actions to reduce climate-related harm to native ecosystems. One action should address the cause of climate change, and one should help ecosystems adapt.