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A number of methods have been developed to score the quality of freshwater habitats based upon the species or taxa present. Species Diversity and Richness offers a range of the methods most frequently used in the United Kingdom and Ireland. These methods will work for most other temperate parts of the world. They could also be used in the tropics, but may no longer be reliable as they do not consider groups such as prawns and crabs which can be abundant in these localities. The program offers 4 related techniques.

 

BMWP scores

ASPT index

Irish water quality rating

LIFE scores