IB ESS 4.4.14 (HL) Biotic index

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026

Practise interpreting biotic index evidence from species tolerance, abundance and diversity as an indirect measure of water quality.

How this is tested

calculate or interpret a biotic index from species tolerance, abundance and diversity data
compare the Trent biotic index with direct pollutant measurements for water quality

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