Read Population Patterns in Space
Population patterns reflect how organisms are distributed, while community diversity depends on richness and evenness.
Population Dispersion and Diversity is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Recognise clumped dispersion
Individuals cluster when resources are patchy or organisms aggregate. Mushrooms on one rotting log share a localised resource; synchronously emerging mayflies can form dense swarms. Territorial nesting birds are more evenly spaced, while wind-dispersed plants can be random.
Compare diversity with richness and evenness
Species richness counts species; evenness compares their relative abundances. Two habitats can have the same richness but different diversity when one is dominated by a single species. The more even community has greater diversity.
OlympIQ exam lens
- ✓Patchy resources and aggregation create clumped patterns.
- ✓Territoriality tends to produce uniform spacing; wind dispersal may produce random spacing.
- ✓Diversity reflects both richness and evenness.
Do not equate more individuals with greater species richness or diversity.
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