Ecosystems and Biotic/Abiotic Factors

Active learning works for ecosystems because students need to see energy and matter in motion rather than memorizing definitions. When they model food webs and energy pyramids with their hands and minds, the abstract concept of trophic levels becomes visible and memorable. This approach also builds collaboration and critical thinking as students negotiate roles and relationships in an ecosystem.

• 5th Year
• The Living World: Senior Cycle Biology
• 3 activities
• 40 min–45 min

Learning Objectives

1. Classify specific components of a local Irish ecosystem as either biotic or abiotic.
2. Explain the interdependence between at least two biotic factors and two abiotic factors within a given ecosystem.
3. Analyze how changes in an abiotic factor, such as light intensity, would affect the distribution of organisms in a specific habitat.
4. Compare and contrast the roles of producers, consumers, and decomposers within an ecosystem.
5. Design a simple experiment to test the effect of an abiotic factor on a biotic component of an ecosystem.

Simulation Game

⏱ 40 min·Whole Class

Simulation Game: The Energy Pyramid Game

Students use tokens to represent energy units. They pass tokens from 'producers' to 'consumers,' with 90% being 'lost' (put in a bin) at each step to demonstrate why top predators are rare.

Prepare & details

Differentiate between biotic and abiotic factors and their interactions within an ecosystem.

Facilitation Tip: During The Energy Pyramid Game, walk around with a stopwatch and call out time intervals so students experience how quickly energy units disappear at each trophic level.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

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

Inquiry Circle

⏱ 45 min·Small Groups

Inquiry Circle: Food Web Construction

Groups are given cards representing organisms from a specific Irish ecosystem (e.g., a rocky shore or a woodland). They must build a complex food web and then predict what happens if one species is removed.

Prepare & details

Explain how abiotic factors like temperature and light influence the distribution of organisms.

Facilitation Tip: When students build food webs collaboratively, give each group a different ecosystem card (e.g., bog, hedgerow) to ensure varied examples and peer teaching.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Gallery Walk

⏱ 40 min·Small Groups

Gallery Walk: Nutrient Cycle Posters

Students create detailed posters of the Carbon and Nitrogen cycles. They then move around the room to identify where bacteria, plants, and animals play their roles in each cycle.

Prepare & details

Analyze the interdependence of living and non-living components in a local ecosystem.

Facilitation Tip: Before the Gallery Walk of nutrient cycle posters, assign each student one role (e.g., decomposer, producer) to ensure all parts of the cycle are represented.

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

Start with a local context, like Irish hedgerows or bogs, to ground abstract ideas in familiar places. Avoid long lectures about energy flow; instead, use analogies like a ‘one-way street’ for energy and a ‘roundabout’ for nutrients. Research shows students grasp energy loss better when they physically manipulate materials (e.g., counters or cards) to simulate energy transfer. Always connect back to biodiversity and human impact to emphasize relevance.

What to Expect

Successful learning looks like students confidently explaining why energy decreases up the food chain and tracing nutrient cycles through producers, consumers, and decomposers. They should use terms like trophic levels, energy loss, and nutrient recycling accurately, and connect these ideas to real local ecosystems like Irish woodlands or salt marshes.

Watch Out for These Misconceptions

Common Misconception

During The Energy Pyramid Game, watch for students who treat decomposers as optional or ‘clean-up crew’ rather than essential recyclers.

What to Teach Instead

Pause the game after each round and ask, ‘What happens to the energy in the fallen oak leaves if we remove the decomposers?’ Use a spotlight on the earthworm or fungus cards to reinforce their role in restarting the cycle.

Common Misconception

During the Food Web Construction activity, watch for students who claim nutrients are ‘recycled back up the food chain’ in the same way as energy.

What to Teach Instead

After groups finish their webs, draw a simple diagram on the board showing a ‘one-way street’ for energy with heat arrows escaping, and a ‘roundabout’ for nutrients cycling back to producers. Ask each group to add arrows to their web to show only energy flow direction.

Assessment Ideas

Quick Check

After The Energy Pyramid Game, provide students with a list of items found in an Irish woodland (e.g., fox, lichen, rainfall, soil bacteria). Ask them to categorize each as biotic or abiotic and explain one reasoning choice for their partner.

Discussion Prompt

During the Gallery Walk of nutrient cycle posters, pose the question: ‘If a new housing development replaces the woodland, which nutrient cycle would be disrupted first, and how would that impact the oak trees and songbirds?’ Use student responses to assess understanding of interconnected cycles.

Exit Ticket

After Food Web Construction, ask students to write down one biotic factor and one abiotic factor from their ecosystem. Then, have them describe one way these two factors interact, such as sunlight enabling grass to grow for rabbits.

Extensions & Scaffolding

• Challenge: Ask students to design a new food chain using invasive species in Ireland and predict how it might disrupt the ecosystem.
• Scaffolding: Provide a partially completed food web template for students who struggle to start, with arrows and some organisms already placed.
• Deeper exploration: Have students research how climate change might alter nutrient cycles in Irish peatlands and present findings as a podcast interview.

Key Vocabulary

Ecosystem	A community of living organisms (biotic) interacting with their non-living physical and chemical environment (abiotic).
Biotic Factors	The living or once-living components of an ecosystem, such as plants, animals, fungi, and bacteria.
Abiotic Factors	The non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems, such as temperature, sunlight, water, and soil.
Habitat	The natural home or environment of an animal, plant, or other organism, defined by its specific biotic and abiotic conditions.
Niche	The role and position a species has in its environment, including how it meets its needs for food and shelter, how it survives, and how it reproduces.