A more responsive richness index.

If a more responsive index of species richness is desired, ie. One that regards a species as being present even if present only in small numbers. Such an index can be generated using exactly the same index as the richness index described above, but first pass each species response index through the lookup table shown in figure 9.

  
Figure 9: Lookup table to make the species richness index more responsive to species present in low biomass.