Ecological Succession

Active learning helps students visualize abstract ecological processes when they manipulate physical models or observe real sites. Hands-on simulations and data tasks move students beyond memorizing stages to explaining cause-and-effect relationships in succession.

• Year 13
• Biology
• 4 activities
• 30 min–60 min

Learning Objectives

1. Compare the starting conditions and pioneer species of primary and secondary ecological succession.
2. Analyze the role of pioneer species in altering abiotic factors and creating conditions for later species.
3. Predict the likely stages and climax community of a given disturbed ecosystem based on its history and environment.
4. Explain the concept of a climax community and the factors that can influence its stability.

Gallery Walk

⏱ 40 min·Small Groups

Tray Simulation: Primary Succession

Provide trays with bare sand or rock chips for primary succession groups, and disturbed soil trays for secondary. Students plant pioneer seeds like moss or fast-growing grasses weekly, measure soil pH and coverage, and photograph changes over 4-6 weeks. Compare progress in class discussions.

Prepare & details

Compare primary and secondary succession in terms of their starting conditions and pioneer species.

Facilitation Tip: During Tray Simulation, circulate to ask students to predict what the next colonizer will be based on lichen growth and moisture changes.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Gallery Walk

⏱ 60 min·Pairs

Field Survey: Local Sites

Visit nearby disturbed areas like abandoned lots or sand dunes. Students use quadrats to record species abundance, identify seral stages, and sketch succession timelines. Back in class, compile data into a shared progression map.

Prepare & details

Analyze the role of pioneer species in modifying the environment for subsequent communities.

Facilitation Tip: For Field Survey, provide clipboards with simple soil-depth rulers and succession-stage checklists so students collect comparable data.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Gallery Walk

⏱ 30 min·Small Groups

Modeling Game: Species Relay

Assign species cards to students representing pioneer to climax stages. In relay rounds, players 'modify' environment props (soil, light filters) to enable the next species. Groups predict and adjust for disruptions like fire.

Prepare & details

Predict the trajectory of ecological succession in a disturbed ecosystem.

Facilitation Tip: In Species Relay, stop play after each round to have teams explain why one ‘species’ survived or failed in its current stage.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Gallery Walk

⏱ 45 min·Individual

Data Analysis: Case Studies

Distribute datasets from real successions (e.g., Mount St. Helens). Students graph species diversity over time, predict future stages, and present findings. Use software for curve fitting.

Prepare & details

Compare primary and secondary succession in terms of their starting conditions and pioneer species.

Facilitation Tip: For Data Analysis, assign each group one case study and ask them to present a two-minute summary of key disturbance factors and successional outcomes.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Teaching This Topic

Teachers should emphasize that succession is not a fixed ladder but a dynamic process shaped by disturbances. Avoid overgeneralizing climax communities; instead, use local examples to show variability. Research suggests that students grasp succession best when they connect micro-scale changes (e.g., soil formation) to macro-scale patterns they can see in the field or model.

What to Expect

Success looks like students accurately differentiating primary and secondary succession, explaining why climax communities vary by location, and using evidence from models or field data to defend their reasoning.

Watch Out for These Misconceptions

Common Misconception

During Tray Simulation, watch for students assuming all succession sequences look identical regardless of starting material.

What to Teach Instead

Use the trays to show how bare volcanic rock versus soil-rich sites alter the arrival of grasses and trees; ask students to sketch predicted timelines on the tray lids.

Common Misconception

During Tray Simulation, watch for students believing pioneer species die immediately when soil appears.

What to Teach Instead

Have students keep the original lichen and moss ‘species’ in the tray and annotate their changing abundance with colored pencils across weeks, noting facilitation and tolerance interactions.

Common Misconception

During Field Survey, watch for students labeling any woodland as a climax community without considering local climate or disturbance history.

What to Teach Instead

Ask teams to record evidence such as fire scars, invasive species, or human infrastructure to justify whether observed communities are stable or transitional.

Assessment Ideas

Exit Ticket

After Tray Simulation, give students two scenarios: a lava flow and a clear-cut forest. Ask them to write one sentence identifying the succession type and name a pioneer species for each scenario.

Quick Check

During Modeling Game, provide a mixed list of species and ask students to arrange them in the correct order for both primary and secondary succession, explaining their reasoning for the transition from grasses to shrubs.

Discussion Prompt

After Data Analysis, pose the question: ‘Is a climax community always the most biodiverse?’ Facilitate a class debate where students cite evidence from their case studies (e.g., fire-maintained prairies versus old-growth forests).

Extensions & Scaffolding

• Challenge students to design an experiment testing how slope angle affects pioneer colonization in their trays.
• Scaffolding: Provide pre-labeled species cards and a partially completed succession sequence for students to arrange before tackling the full task.
• Deeper exploration: Invite students to research human-altered successional sites (e.g., post-mining reclamation) and compare them to natural secondary succession sites.

Key Vocabulary

Ecological Succession	The process of change in the species structure of an ecological community over time. It involves a series of stages, from initial colonization to a more stable climax community.
Primary Succession	Ecological succession that begins in an environment devoid of life and soil, such as bare rock or sand. It starts with pioneer species colonizing the barren substrate.
Secondary Succession	Ecological succession that occurs in an area where a previous community existed but was disturbed or removed, leaving soil intact. Examples include areas after fires or logging.
Pioneer Species	The first species to colonize a barren environment or a disturbed ecosystem. They are typically hardy and modify the environment, making it suitable for other species.
Climax Community	A stable, mature ecological community that represents the final stage of succession for a particular environment, in the absence of significant disturbance.