Abundance — Science definition
How many individuals there are, in total or of each species; identical to richness in telling you nothing about distribution.
Where it is taught
- Biodiversity, Variation & Ecosystem Resilience — Ecological Evidence & Environmental Design, Life Science & Scientific Inquiry, Grade 7
In use
Abundance is how many individuals there are, of each species or in total — a hundred in both.
Biodiversity, Variation & Ecosystem Resilience
Questions using abundance
Problem 1
Illustrative equal-effort samples: A has species counts 8,1,1; B has 4,3,3. Both samples include ten individuals and three detected species.
Compare richness, total abundance, and distribution without claiming one number proves universal stability.
Answer and explanation
The samples have equal richness and total count but different distributions. B is more even under the stated observations. These facts do not establish every functional relationship, genetic diversity, or response to future disturbances. Comparable repeated surveys and role-specific evidence would improve a resilience argument.
Richness is three in each.
Total abundance is ten in each.
A is more dominated by one species; B is more evenly distributed.
Response criteria
- Explain the relevant biological process accurately.
- Use the supplied evidence and show calculation steps with units where needed.
- Connect a labeled model or mechanism with the claim.
- State an assumption, evidence limitation, or useful next observation.