Separate ecological levels

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: A survey lists one frog species, insects, algae and water chemistry in one pond. Explain population versus ecosystem scope.
• Assessment case 1: One frog is sampled beside ten more frogs of the same species and water measurements. What scope fits each? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: All sampled frogs of one species in the stated pond.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Frogs plants and insects together.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Organisms water rock and air together.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: One oak tree.
• Assessment case 6: The plot record includes only oak individuals of one species. What does adding insects and soil data change? Which inference or prediction is best supported?

Learn the idea

An organism is one individual; a population includes members of one species in a defined place. A community includes multiple populations, and an ecosystem also includes physical surroundings.

Organism means one living individual. Population means same-species individuals in defined area. Community means multiple interacting populations. Ecosystem means community plus physical environment.

For the supplied mechanism problem, A survey lists one frog species, insects, algae and water chemistry in one pond. Explain population versus ecosystem scope. The individuals of that frog species can form a defined population. Multiple organism populations form a community, and including physical water conditions broadens the model to an ecosystem.

1. Read the supplied problem and mark the structures, processes or quantities named: A survey lists one frog species, insects, algae and water chemistry in one pond. Explain population versus ecosystem scope.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New case: a plot contains one oak, 20 pines of one species, several animal species and soil moisture records. Expected: organism, defined population, community and ecosystem refer to progressively broader supplied components.

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