Science · Grade 10 · Earth Systems and Climate · Term 4

Impacts on Ecosystems and Biodiversity

Analyzing the effects of climate change on global ecosystems, species distribution, and biodiversity.

• Ontario Curriculum Expectations
• HS-ESS3-5
• HS-LS2-7

About This Topic

Climate change reshapes global ecosystems through rising temperatures, shifting precipitation patterns, and ocean acidification. In Grade 10 science, students analyze how warmer conditions drive species poleward or to higher elevations, disrupt migration timing, and reduce habitat suitability. They also examine ocean acidification, where increased CO2 lowers pH levels and dissolves calcium carbonate shells of corals, mollusks, and plankton, cascading through food webs. Biodiversity declines as specialized species face extinction risks from these rapid changes.

This topic aligns with Ontario curriculum expectations for understanding earth systems interactions and human impacts. Students evaluate data on species distributions, predict ecosystem consequences, and consider mass extinction thresholds, fostering skills in evidence-based reasoning and modeling complex systems.

Active learning shines here because students grapple with real datasets and simulations. Mapping historical versus projected species ranges or debating conservation strategies makes abstract global impacts concrete and personally relevant, boosting retention and critical thinking.

Key Questions

1. Analyze how rising global temperatures affect species distribution and migration patterns.
2. Predict the consequences of ocean acidification on marine ecosystems.
3. Evaluate the potential for mass extinctions due to rapid climate change.

Learning Objectives

• Analyze data sets to identify trends in species distribution shifts correlated with rising global temperatures.
• Evaluate the impact of ocean acidification on the survival rates of specific marine organisms, such as corals and shellfish.
• Predict the cascading effects of biodiversity loss on ecosystem stability and function.
• Compare the projected consequences of rapid climate change on different biomes, such as Arctic tundra and tropical rainforests.
• Synthesize information to propose mitigation strategies for reducing human impact on vulnerable ecosystems.

Before You Start

Climate Change Causes and Evidence

Why: Students need to understand the fundamental drivers of climate change, such as greenhouse gas emissions, to analyze its impacts on ecosystems.

Ecosystem Structure and Function

Why: A foundational understanding of food webs, habitats, and the interdependence of organisms is necessary to analyze how climate change disrupts these systems.

Key Vocabulary

Species Distribution	The geographic range where a particular species lives. Climate change can cause these ranges to shift towards the poles or to higher altitudes.
Ocean Acidification	The ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide from the atmosphere. This process harms marine life, particularly organisms with calcium carbonate shells or skeletons.
Biodiversity	The variety of life in a particular habitat or ecosystem. Climate change can lead to a significant reduction in biodiversity as species struggle to adapt.
Phenology	The study of cyclic and seasonal natural phenomena, especially in relation to climate and plant and animal life. Changes in phenology, like earlier flowering or migration, are indicators of climate change impacts.
Ecosystem Resilience	The ability of an ecosystem to resist disturbance and recover quickly. Biodiversity plays a crucial role in maintaining ecosystem resilience.

Watch Out for These Misconceptions

Common Misconception

Climate change only harms polar animals like polar bears.

What to Teach Instead

Many ecosystems worldwide suffer, including coral reefs from acidification and temperate forests from droughts. Active mapping activities reveal global patterns, helping students visualize broad distributions and challenge narrow views through peer comparisons.

Common Misconception

Species can quickly adapt or migrate to escape impacts.

What to Teach Instead

Evolutionary adaptation takes generations, outpaced by rapid change, leading to extinctions. Simulations of migration barriers show limitations, while group discussions refine ideas with evidence from real studies.

Common Misconception

Ocean acidification has little effect on food chains.

What to Teach Instead

It disrupts base-level plankton and shell-formers, rippling upward. Hands-on pH experiments with shells demonstrate dissolution, prompting students to trace effects in modeled food webs.

Active Learning Ideas

Jigsaw: Climate Impacts

Divide class into expert groups on temperature shifts, migration disruptions, ocean acidification, and biodiversity loss. Each group analyzes provided data sources and creates a summary poster. Groups then teach their topic to new mixed groups, followed by a whole-class synthesis discussion.

50 min·Small Groups

Data Mapping: Species Shifts

Provide maps and datasets on species ranges before and after climate shifts. Pairs plot changes using colored markers or digital tools, identify patterns, and predict future distributions. Share findings in a gallery walk.

35 min·Pairs

Debate Simulation: Extinction Scenarios

Assign roles as scientists, policymakers, or stakeholders. Small groups prepare arguments on whether rapid climate change will cause mass extinctions, using evidence cards. Hold a structured debate with rebuttals and vote on best-supported position.

45 min·Small Groups

Model Building: Food Web Disruptions

In small groups, construct physical or digital food webs for a marine ecosystem. Introduce climate change variables like acidification and observe chain reactions by removing or altering species. Discuss resilience strategies.

40 min·Small Groups

Real-World Connections

• Marine biologists working for organizations like Fisheries and Oceans Canada are studying how warming waters and ocean acidification affect cod populations off the Atlantic coast, impacting local fishing industries.
• Conservation ecologists use climate models to predict how species like the Woodland Caribou might lose habitat in the Canadian Rockies and develop strategies for assisted migration or habitat restoration.
• Agricultural scientists are investigating how changing temperature and precipitation patterns influence the growing seasons and yields of crops like canola and wheat in the Prairies, advising farmers on adaptation techniques.

Assessment Ideas

Quick Check

Present students with a graph showing rising global temperatures and a separate graph showing the migration patterns of a specific bird species over the same period. Ask: 'Based on these graphs, what is one observable relationship between temperature and species migration?'

Discussion Prompt

Pose the question: 'Imagine you are advising a coastal community facing rising sea levels and increased storm intensity due to climate change. What are two key ecosystem services they might lose, and why are these losses significant?'

Exit Ticket

Students receive a card with a marine organism (e.g., oyster, coral, plankton). They must write one sentence explaining how ocean acidification directly impacts this organism and one sentence describing a potential consequence for the broader marine food web.

Frequently Asked Questions

How does rising temperature affect species distribution?

Warmer temperatures shift habitable zones poleward or upslope, forcing species to migrate. Many cannot keep pace due to barriers like mountains or cities, leading to local extinctions and homogenized biodiversity. Students use distribution maps to track these shifts, connecting data to predictions.

What causes ocean acidification and its ecosystem effects?

Excess atmospheric CO2 dissolves in seawater, forming carbonic acid that lowers pH. This harms calcifying organisms like corals and shellfish, weakening reefs and food sources. Marine biodiversity drops as food webs collapse; lab demos with vinegar and shells illustrate the chemistry.

How can active learning help teach climate impacts on biodiversity?

Activities like jigsaw research and food web models engage students directly with data and scenarios. They collaborate to analyze real impacts, debate solutions, and simulate changes, turning overwhelming global issues into manageable, evidence-driven explorations that build systems thinking and empathy.

What evidence supports mass extinctions from climate change?

Fossil records from past events like the Permian show rapid warming linked to 90% species loss. Current rates exceed natural backgrounds by 100-1000 times, per IPBES reports. Graphing extinction curves in class helps students evaluate trajectories and urgency.