New Zealand Threat Classification System
The New Zealand Threat Classification System is used by the Department of Conservation to assess conservation priorities of species in New Zealand.
The system was developed because the IUCN Red List, a similar conservation status system, had some shortcomings for the unique requirements of conservation ranking in New Zealand. plants, animals, and fungi are evaluated, though the lattermost has yet to be published. Algae were assessed in 2005 but not reassessed since. Other protists have not been evaluated.
Categories
Species that are ranked are assigned categories:;Threatened
This category has three major divisions:
;At Risk
This has four categories:
;Other categories
;;Introduced and Naturalised
These are any species that are deliberately or accidentally introduced into New Zealand.
;;Migrant
Migrant species are those that visit New Zealand as part of their life cycle.
;;Vagrant
Vagrants are taxa that are rare in New Zealand that have made their own way and do not breed successfully.
;;Coloniser
These taxa have arrived in new Zealand without human help and reproduce successfully.
;;Data Deficient
This category lists taxa for which insufficient information is available to make as assessment on conservation status.
;;Extinct
Taxa for which there is no reasonable doubt that no individuals exist are ranked as extinct. For these lists only species that have become extinct since 1840 are listed.
;;Not Threatened
If taxa fit into none of the other categories they are listed in the Not Threatened category.
Qualifiers
A series of qualifiers are used to give additional information on the threat classification:| CD | Conservation Dependent | Likely to move to a higher threat category if current management ceases |
| DP | Data Poor | Confidence in the listing is low due to the poor data available for assessment |
| De | Designated | The criteria does not completely apply to the taxa |
| EW | Extinct in the Wild | Exists only in cultivation or in captivity |
| EF | Extreme Fluctuations | Extreme unnatural population fluctuations, or natural fluctuations overlaying human-induced declines, that increase the threat of extinction |
| Inc | Increasing | Population thought to increase 10% over 3 generations or 10 years |
| IE | Island Endemic | endemic only to a single archipelago and not the main islands |
| OL | One Location | Found at one location in which a single event could soon affect all individuals of the taxon |
| PD | Partial Decline | Taxa has one or more secure populations but otherwise is declining |
| RR | Range Restricted | taxa confined to less than 1000 km2 |
| RF | Recruitment Failure | Current population may appear stable but the age structure is such that catastrophic declines are likely in the future |
| SO | Secure Overseas | Secure in other parts of its natural range outside New Zealand |
| Sp | Sparse | Taxa in small, scattered populations |
| ST | Stable | Total population stable |
| TO | Threatened Overseas | Threatened in those parts of its natural range outside New Zealand |