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Indicator species reveal environmental conditions

Indicator species reveal environmental conditions

Stream diagram showing stonefly nymphs and freshwater shrimps in cleaner oxygen-rich water upstream, followed by organic pollution, increased decomposition and respiration, reduced dissolved oxygen, and bloodworms and sludgeworms downstream

An indicator species is a species whose presence, absence or abundance provides evidence about environmental conditions. Indicator organisms show the biological effects of pollution over time, rather than the pollutant concentration at only one moment.

9.3.5 Indicator species and pollution Lesson

  1. GCSE
  2. /Biology
  3. /9.3.5 Indicator species and pollution

Step-by-step lessons on Edexcel GCSE Biology 9.3.5 Indicator species and pollution. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons