Ecological Succession: Primary and Secondary

Active learning works for ecological succession because the concept involves slow, invisible processes that become clear through hands-on models and timelines. Students need to see how small changes accumulate over time, not just hear about them. These activities turn abstract stages into visible, measurable events students can track and compare in real time.

• Grade 7
• Science
• 4 activities
• 30 min–45 min

Learning Objectives

1. Compare and contrast the initial conditions and processes involved in primary and secondary ecological succession.
2. Analyze the role of pioneer species in soil formation and the establishment of new plant communities.
3. Predict the sequence of plant and animal community changes following a significant natural disturbance, such as a volcanic eruption or a forest fire.
4. Classify different stages of ecological succession based on the dominant plant species present.

Stations Rotation

⏱ 45 min·Small Groups

Stations Rotation: Succession Stages

Prepare four stations with trays: bare rock (lichens simulated by moss), soil formation (add grasses), shrub stage (plant small bushes), and climax forest (add trees). Groups rotate every 10 minutes, sketching changes and noting pioneer roles. Conclude with a class chart comparing primary to secondary.

Prepare & details

Differentiate between primary and secondary succession with examples.

Facilitation Tip: During the Station Rotation, place a timer at each station and have students record observations every five minutes to track changes over time.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Case Study Analysis

⏱ 30 min·Pairs

Timeline Construction: Predict Post-Fire Recovery

Provide images of a burned forest area over years. In pairs, students sequence cards showing grasses, shrubs, and trees into a timeline, labeling pioneer species and soil advantages. They predict year 50 based on patterns.

Prepare & details

Analyze the role of pioneer species in establishing new ecosystems.

Facilitation Tip: When students build their microcosm models, ask them to write a hypothesis about which succession stage will appear first and why before adding any materials.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Case Study Analysis

⏱ 40 min·Individual

Microcosm Model: Build Your Ecosystem

Students layer jars: primary with rock and lichens, secondary with soil and seeds. Observe weekly over two weeks, recording species arrival and changes. Discuss acceleration in secondary setups.

Prepare & details

Predict the sequence of changes in an ecosystem after a major natural disaster.

Facilitation Tip: For the Timeline Construction activity, provide blank strips of paper in three colors to represent pioneer species, intermediate stages, and climax communities for easy categorization.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Case Study Analysis

⏱ 35 min·Small Groups

Case Study Debate: Local Disturbance

Share a real Ontario forest fire case. Groups debate primary vs. secondary paths, citing evidence from photos. Vote on predictions for biodiversity recovery.

Prepare & details

Differentiate between primary and secondary succession with examples.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Teaching This Topic

Teachers approach succession by making the invisible visible through models and timelines first, then connecting those models to real-world cases. Avoid starting with abstract definitions; instead, let students experience the stages through activities and then formalize the language afterward. Research shows students grasp the speed differences between primary and secondary succession best when they can time both processes side-by-side in controlled settings.

What to Expect

Successful learning looks like students accurately describing how pioneer species alter environments, comparing primary and secondary succession speeds, and defending predictions about climax communities. They should use evidence from models and timelines to explain their reasoning, not just memorize terms. Collaboration and revision based on observations show deep understanding.

Watch Out for These Misconceptions

Common Misconception

During the Station Rotation activity, watch for students assuming primary and secondary succession happen at the same speed.

What to Teach Instead

Use the terrarium models at two stations to have students measure growth over two weeks, noting how bare rock requires moss growth before soil forms while the secondary succession station shows immediate sprouting from existing soil.

Common Misconception

During the Timeline Construction activity, watch for students assuming succession always reaches the exact same climax community.

What to Teach Instead

Ask groups to compare their timelines and explain why their climax communities differ, using local climate and soil data to justify variations in their predictions.

Common Misconception

During the Succession Stages Station Rotation, watch for students believing pioneer species disappear once succession advances.

What to Teach Instead

Have students revisit the pioneer species station after completing the rotation and document where lichens or mosses still appear in later stages, challenging the idea of total replacement.

Assessment Ideas

Quick Check

After the Succession Stages Station Rotation, present students with images of different landscapes and ask them to label each as primary succession, secondary succession, or climax community. Collect responses to assess their ability to apply the stages they observed.

Exit Ticket

After the Microcosm Model activity, have students define primary succession and give an example of a pioneer species on an index card. Then ask them to define secondary succession and provide an example of a disturbance that leads to it.

Discussion Prompt

During the Case Study Debate, pose the question about a cleared forest area and facilitate a discussion on predictions. Listen for students using evidence from their timelines or models to support their ideas about regrowth and future ecosystems.

Extensions & Scaffolding

• Challenge students to design a microcosm model that simulates a disturbance event, such as adding vinegar to simulate acid rain, and predict how succession will restart.
• For students struggling with timeline construction, provide partially completed examples with some pioneer species already labeled to scaffold their predictions.
• Deeper exploration: Have students research a local ecological disturbance, then create a digital timeline showing the predicted succession stages and defending their choices in a short written report.

Key Vocabulary

Ecological Succession	The gradual process by which ecosystems change and develop over time, leading to a more stable climax community.
Primary Succession	Ecological change that begins on surfaces that are devoid of soil, such as bare rock, lava flows, or sand dunes.
Secondary Succession	Ecological change that occurs in areas where a previous community existed but was disturbed, leaving soil intact, such as after a fire or logging.
Pioneer Species	The first species, typically hardy plants like lichens and mosses, to colonize barren land and initiate soil formation.
Climax Community	A stable, mature ecological community that represents the final stage of succession for a particular environment.