The susceptibility of a species population to damage, or death, from an external factor. Intolerance is assessed relative to change in a specific factor.
| Rank | Definition |
|---|---|
| High | The species population is likely to be killed/destroyed by the factor under consideration. |
| Intermediate | Some individuals of the species may be killed/destroyed by the factor under consideration and the viability of a species population may be reduced. |
| Low | The species population will not be killed/destroyed by the factor under consideration. However, the viability of a species population will be reduced. |
| Tolerant | The factor does not have a detectable effect on survival or viability of a species. |
| Tolerant* | Population of a species may increase in abundance or biomass as a result of the factor. |
| Not relevant | This rating applies to species where the factor is not relevant because they are protected from the factor (for instance, through a burrowing habit), or can move away from the factor. |
| Insufficient information | Insufficient information |