Write a bounded ecosystem explanation
See this course’s project requirements
A food-web and carbon-cycle model explaining a fictional ecosystem disturbance, with a supported prediction and an alternative explanation.
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What to include
- Classify organism roles and nonliving conditions.
- Draw all supplied food-to-eater and decomposer links.
- Separate carbon cycling from energy flow and calculate the supplied fraction.
- Classify interactions from both partners’ stated effects.
- Trace a disturbance with an alternative food path.
- Write a bounded explanation of the supplied counts and complete changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Fictional counts from equal survey effort: before disturbance grasshoppers 80, frogs 20, rabbits 30, hawks 8; later grasshoppers 40, frogs 12, rabbits 30, hawks 8. Rainfall and movement were not measured. Reuse Meadow M’s feeding web and supplied carbon routes.
An explanation connects an observation to a mechanism and acknowledges plausible alternatives. A food-web prediction is not a proof of causation from one before/after comparison. Integrate energy, carbon and interaction models while keeping observed data separate from predicted effects.
Write a bounded ecosystem explanation — worked practice
An explanation connects an observation to a mechanism and acknowledges plausible alternatives. A food-web prediction is not a proof of causation from one before/after comparison. Integrate energy, carbon and interaction models while keeping observed data separate from predicted effects.
Fictional counts from equal survey effort: before disturbance grasshoppers 80, frogs 20, rabbits 30, hawks 8; later grasshoppers 40, frogs 12, rabbits 30, hawks 8. Rainfall and movement were not measured. Reuse Meadow M’s feeding web and supplied carbon routes.
1. 1. Observe
Record changes without inserting a cause.
You should see: Grasshoppers fall by 40; frogs by 8; rabbits and hawks unchanged in this record.
2. 2. Mechanism
Connect a possible frog decline to a supplied food link.
You should see: Fewer grasshoppers could reduce frog food; this fits but does not prove the cause.
3. 3. Alternative
Give one unresolved explanation from missing conditions.
You should see: Changed rainfall or frog movement could also affect counts.
4. 4. Synthesize
Write a brief combining the web, carbon route, observed changes and test plan.
You should see: The brief separates observations, conditional food-path explanation, alternative and needed repeated records.
What to finish
A final ecosystem brief containing observed changes, mechanism, alternative and test plan.
Watch for this
The carbon route addresses where matter moves and returns. It complements the feeding web without replacing observations or guaranteeing recovery.
How can I tell I understand it?
Revise the count calculation and explanation when the observation changes.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
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