species richness
What species richness means in Biology A-Level, as defined for AQA, OCR.
Definitions of species richness
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Reference: OCR
The number of different species present in a habitat, counted without regard to how many individuals each species has.
Only counts the number of species present, whereas the index accounts for relative abundance.
A measure of biodiversity that counts species present but omits evenness.
A count of how many different species are present in a community.
Topics that use species richness
- Biodiversity within a community (AQA A-Level)
- Populations in ecosystems (A-level only) (AQA A-Level)
- Biodiversity (OCR A-Level)
Related terms
- index of diversity
- random sampling
- abiotic components
- abiotic factors
- Aesthetic reasons for maintaining biodiversity
- belt transect
- Climate change
- community
Using species richness in the exam
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