In the "Gizmos: Ecosystems STEM Case Study" food web mystery, what are the definitions of a producer, consumer, and decomposer in an ecosystem?
The Mission
You are a Wildlife Biologist at a national park. The ecosystem is out of balance, and it’s your job to use the data to find out why. Complete the tasks below as you work through the digital simulation.
Part 1: The Food Web Mystery.
1. In an ecosystem, every organism has a job.
A producer is an organism, usually a plant or algae, that makes its own food (typically by photosynthesis) and forms the base of a food web. A consumer is an organism that gets energy by eating other organisms (herbivores, carnivores, and omnivores). A decomposer is an organism like bacteria or fungi that breaks down dead organisms and wastes, returning nutrients to the ecosystem.
What this question is testing in the Gizmos ecosystem case study
To solve the “food web mystery,” you need to identify each organism’s role in energy flow (who makes energy-rich food, who eats, and who recycles nutrients). These three roles explain why changing one population can throw the whole ecosystem out of balance.
Producer: where the food web’s energy starts
- Definition: A producer makes its own food from nonliving resources.
- Most producers use photosynthesis: $$6CO_2 + 6H_2O + \text{light} \rightarrow C_6H_{12}O_6 + 6O_2$$
- Examples: grasses, trees, algae, phytoplankton.
Consumer: organisms that must eat for energy
- Definition: A consumer gets energy by eating other organisms.
- Common types of consumers:
- Primary consumers eat producers (herbivores)
- Secondary/tertiary consumers eat other consumers (carnivores)
- Omnivores eat both plants and animals
- Examples: rabbits (primary), wolves (secondary/tertiary), bears (often omnivores).
Decomposer: recycling nutrients back into the system
- Definition: A decomposer breaks down dead organisms and waste, returning nutrients to soil or water.
- Decomposers do not “create” energy, but they keep matter cycling so producers can grow.
- Examples: fungi (mushrooms), bacteria, many detritivores (often grouped with decomposers in school food webs).
Quick way to remember
- Producers: make food.
- Consumers: eat food.
- Decomposers: break down leftovers and dead matter, recycling nutrients.
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