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GCSE Biology · key term
An organism whose presence, absence or abundance can provide evidence about environmental conditions.
Used by Edexcel and OCR
Specification 9.16B · Paper 2
A species whose presence, absence or abundance provides evidence about environmental conditions, such as pollution.
Revise: Indicator SpeciesAn indicator species is useful because its presence, absence or abundance is associated with particular conditions. Surveying several species gives evidence of the biological effects of pollution. It does not directly measure how much of a pollutant is present.
Specification B6.1d · Paper 2 (Foundation), Paper 4 (Higher)
Describe water as relatively clean or polluted; an indicator species does not reveal the exact pollutant concentration.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A species whose presence or abundance can provide evidence about environmental conditions.
Revise: Field InvestigationsAn indicator species can also provide evidence about conditions, although its presence should be interpreted alongside direct measurements.
An organism whose presence, absence or abundance can give evidence about environmental conditions.