Science · Grade 9

Active learning ideas

Community Interactions: Competition & Predation

Active learning works for this topic because students must experience the mechanisms of competition and predation to grasp their effects. Simulations and role-plays create a visceral understanding of resource limits and population dynamics that lectures cannot replicate.

• Ontario Curriculum Expectations
• HS-LS2-2

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 45 min · Pairs

Simulation Game: Predator-Prey Bean Hunt

Scatter green beans (prey) and red lentils (predators) on the floor. Pairs act as predators collecting prey in 1-minute rounds, recording captures. Over 10 rounds, graph population trends to observe cycles. Discuss factors like predator efficiency.

Analyze how interspecific competition can lead to resource partitioning.

Facilitation Tip

When introducing an invasive predator, assign roles so students simulate both the predator's impact and the prey's responses over multiple generations.

What to look for

Present students with a scenario describing two species in a habitat with a shared food source. Ask them to identify the type of interaction (competition) and predict whether competitive exclusion or resource partitioning is more likely to occur, justifying their answer.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Case Study Analysis
• 35 min · Small Groups

Role-Play: Resource Partitioning

Assign small groups species roles competing for paper resources (food, space). Introduce scarcity, then guide partitioning strategies like time or location shifts. Groups present adaptations and vote on survival likelihood.

Predict the long-term effects of introducing a new predator into an ecosystem.

What to look for

Facilitate a class discussion using the prompt: 'Imagine a new bird species is introduced to an area with established insectivorous birds. What are two ways this new species could impact the native bird populations, and what evidence would you look for to support your predictions?'

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

Activity 03

• Stations Rotation
• 50 min · Small Groups

Stations Rotation: Competition Scenarios

Set up stations with models: exclusion (one species dominates), partitioning (shared niches), predation webs. Groups rotate, predict outcomes, and adjust variables like resource levels. Compile class data for patterns.

Differentiate between competitive exclusion and resource partitioning.

What to look for

Provide students with a diagram of a simple food web. Ask them to circle one predator-prey relationship and one competitive relationship. Then, have them write one sentence explaining how removing the predator would affect the prey population.

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

Activity 04

• Case Study Analysis
• 30 min · Whole Class

Invasive Predator Introduction

Use whole class as ecosystem; introduce 'invasive' volunteers as new predators. Track prey decline over rounds with counters. Debrief long-term effects and stewardship solutions.

Analyze how interspecific competition can lead to resource partitioning.

What to look for

Present students with a scenario describing two species in a habitat with a shared food source. Ask them to identify the type of interaction (competition) and predict whether competitive exclusion or resource partitioning is more likely to occur, justifying their answer.

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

A few notes on teaching this unit

Teachers should emphasize that competition and predation are not one-sided but dynamic interactions. Avoid framing these relationships as purely destructive; instead, highlight how they drive adaptation and ecosystem stability. Research shows students retain concepts better when they see immediate cause-and-effect in simulations.

Successful learning looks like students explaining how competition leads to coexistence or exclusion, and how predation creates population cycles. They should connect these concepts to ecosystem balance and cite evidence from their activities.

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Watch Out for These Misconceptions

• During the Role-Play: Resource Partitioning activity, watch for students assuming the strongest or most aggressive species will always win.

  Use the role-play’s resource zones to redirect students: have them adjust behaviors or timing to demonstrate that partitioning allows coexistence, and collect their data sheets to highlight successful strategies.

• During the Simulation: Predator-Prey Bean Hunt activity, watch for students believing predators will always eliminate prey populations.

  After each round, pause the simulation to graph predator and prey numbers, then ask students to predict the next cycle and explain why prey rebound—use their graphs to correct the misconception with evidence.

• During the Station Rotation: Competition Scenarios activity, watch for students assuming competition only happens between species that look alike.

  Provide station cards showing diverse species (e.g., birds and insects sharing nectar) and ask students to identify the shared resource, then discuss how similar-looking species might avoid competition through timing or feeding habits.

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Methods used in this brief

• Simulation Game
• Case Study Analysis
• Stations Rotation