Biology · Year 13 · Genetics, Populations, and Evolution · Summer Term

Impact of Climate Change on Ecosystems

Investigate the effects of global climate change on biodiversity, species distribution, and ecosystem function.

About This Topic

Climate change reshapes ecosystems through rising temperatures, shifting precipitation, and increased extreme events. Year 13 students investigate biodiversity declines from habitat loss and extinctions, species range shifts toward poles or higher altitudes, and disruptions to ecosystem functions like nutrient cycling. They analyze direct impacts, such as thermal stress on marine life, and indirect ones, including trophic cascades when predator-prey timings desynchronize.

This topic aligns with the Genetics, Populations, and Evolution unit by linking to population viability under environmental stress, natural selection pressures for thermal tolerance, and conservation strategies preserving genetic diversity. Students use models to predict food web alterations and evaluate adaptation versus mitigation, fostering quantitative skills with data from sources like the IPCC and UK Ecological Observatory Network.

Active learning excels here because complex, interconnected processes benefit from collaborative simulations and data-driven inquiries. When students construct ecosystem models or debate policy interventions in small groups, they grasp causal chains, refine arguments with evidence, and connect abstract predictions to observable trends, building confidence in scientific reasoning.

Key Questions

1. Analyze the direct and indirect impacts of rising global temperatures on ecosystems.
2. Predict how climate change might alter species interactions and food webs.
3. Evaluate potential mitigation and adaptation strategies for ecosystems facing climate change.

Learning Objectives

• Analyze the direct and indirect impacts of rising global temperatures on specific UK ecosystems, such as peatlands or coastal marshes.
• Predict how climate change might alter species interactions and food webs within a chosen terrestrial or aquatic ecosystem.
• Evaluate the effectiveness of at least two potential mitigation strategies for a UK ecosystem facing climate change.
• Compare the vulnerability of different species within an ecosystem to climate-induced range shifts.
• Synthesize data from scientific reports to explain the link between climate change and biodiversity loss in a specific biome.

Before You Start

Population Dynamics and Carrying Capacity

Why: Understanding how populations change in size and are limited by environmental factors is crucial for analyzing climate change impacts on species viability.

Food Webs and Trophic Levels

Why: Students need to understand predator-prey relationships and energy flow to predict how climate change will disrupt these interactions.

Basic Principles of Evolution and Natural Selection

Why: Knowledge of natural selection is necessary to understand how species might adapt or fail to adapt to changing environmental conditions.

Key Vocabulary

Phenological Mismatch	A disruption in the timing of seasonal life cycle events between interacting species, such as plants flowering before their pollinators emerge.
Range Shift	The movement of a species' geographic distribution in response to changing environmental conditions, often towards cooler latitudes or higher altitudes.
Trophic Cascade	An indirect effect in a community that is initiated by a predator, where the predator affects the prey, which in turn affects the next lower trophic level.
Ecosystem Resilience	The capacity of an ecosystem to absorb disturbance and reorganize while undergoing change so as to essentially retain the same function, structure, identity, and feedbacks.

Watch Out for These Misconceptions

Common Misconception

Climate change affects only polar or tropical ecosystems equally.

What to Teach Instead

Impacts vary by biome; temperate UK systems face novel stressors like invasive species influx. Comparing datasets in station rotations helps students identify context-specific patterns and discard uniform assumptions through peer evidence sharing.

Common Misconception

Species always adapt quickly via evolution to climate shifts.

What to Teach Instead

Generational lags and genetic bottlenecks limit rapid adaptation; many face extinction risks. Modeling exercises with scenario cards reveal time scales, prompting students to integrate population genetics concepts during group discussions.

Common Misconception

Ecosystems recover fully after climate disturbances.

What to Teach Instead

Alternative stable states often emerge, reducing resilience. Food web rearrangements in activities show cascading losses, helping students visualize hysteresis through iterative group predictions and revisions.

Active Learning Ideas

Data Stations: Range Shifts

Prepare stations with graphs of species distributions from UK monitoring data, biodiversity metrics, and temperature records. Small groups rotate every 10 minutes, plot trends, hypothesize causes, and propose ecosystem consequences. Conclude with a class synthesis chart.

50 min·Small Groups

Food Web Modeling: Scenario Cards

Provide cards depicting species interactions in a UK woodland ecosystem. Groups draw climate change scenarios like drought or migrant arrivals, rearrange connections, and calculate stability indices. Share models in a gallery walk.

40 min·Small Groups

Debate Pairs: Mitigation Options

Assign pairs one strategy each, such as protected corridors or assisted migration. They gather evidence from handouts, rotate partners to defend and rebut, then vote on class priorities with justifications.

45 min·Pairs

Jigsaw: Coral Reefs

Divide reef case study into expert sections on bleaching, symbiosis breakdown, and recovery efforts. Individuals research, teach peers in home groups, then quiz on integrated impacts.

35 min·Small Groups

Real-World Connections

• Conservation ecologists at the Royal Society for the Protection of Birds (RSPB) are using climate models to predict how bird migration patterns and breeding success will be affected in the UK, informing habitat management strategies.
• Marine biologists studying the North Sea are monitoring changes in fish populations and plankton distribution, directly linking these shifts to warming sea temperatures and altered ocean currents.
• Forestry managers in the New Forest are assessing the risk of drought stress and increased pest outbreaks on native tree species, adapting management plans to promote climate-resilient woodlands.

Assessment Ideas

Discussion Prompt

Pose the question: 'Imagine you are advising a local council on protecting a nearby wetland ecosystem from climate change. What are the top two most significant threats, and what single adaptation strategy would you prioritize?' Students should justify their choices with evidence.

Quick Check

Provide students with a short case study of a UK ecosystem experiencing climate change impacts (e.g., a specific butterfly species' range contracting). Ask them to identify one direct impact, one indirect impact, and one potential consequence for the food web within that ecosystem.

Exit Ticket

On an index card, have students write down one species whose distribution they predict will change due to climate change in the UK, and one reason for this prediction. They should also list one human activity that contributes to this climate change.

Frequently Asked Questions

How does climate change alter species distributions in UK ecosystems?

Rising temperatures drive poleward and upslope migrations, but barriers like urban areas trap species. UK examples include oak processionary moth expansion northward. Students analyze distribution maps to quantify shifts, linking to dispersal limitations and habitat fragmentation in population models.

What active learning strategies work best for climate change ecosystem impacts?

Use data stations for hands-on trend analysis, food web modeling to simulate disruptions, and structured debates for evaluating strategies. These build systems thinking as students collaborate on predictions, integrate real datasets, and argue evidence-based solutions, making global scales relatable and memorable.

How to predict food web changes from climate change?

Identify keystone species vulnerabilities, then model trophic mismatches like earlier bird migrations missing insect peaks. Tools include interaction matrices adjusted for phenology shifts. Classroom activities with scenario cards quantify stability, training students in network analysis for A-level assessments.

What mitigation strategies help ecosystems adapt to climate change?

Strategies include habitat corridors for migration, diverse planting to boost resilience, and reducing local emissions. UK initiatives like Nature Recovery Network exemplify this. Evaluate via cost-benefit debates, where students weigh ecological gains against feasibility using case study evidence.