Resources can limit growth and reproduction when organisms' demands overlap. Competition may occur within a species or between species. This model conserves a pool of resource markers and divides it evenly among identical users. It is a transparent bookkeeping example rather than a prediction of which species wins, how tall plants grow or how many animals survive.
Plants, animals and ecosystems · Discover & try
What happens when living things share a limited resource?
Reading level 3 of 5 · IndependentChange
Word help
resource
Something an organism uses, such as water, food or space.
competition
Reduced access when users require overlapping limited resources.
Watch · Try · Explain
See how it works
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Equal-user resource tokens; shares are bookkeeping, not real growth, survival or carrying-capacity predictions.
What to look for
- The resource total is conserved
- Supply and demand are separate
- Real organisms need not share equally
Explain what you noticed
Two lizards and then four lizards share the same limited insect supply. What new pressure is plausible?
Keep this idea: Demand can grow without the available supply growing.
Follow the sources
- Smithsonian Learning Lab — Interdependent Relationships in Ecosystems
- Smithsonian research repository — Living Close to Your Neighbors: Competition and Facilitation
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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