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The 'NatureServe conservation status' system was developed by NatureServe, The Nature Conservancy (TNC) and the Natural Heritage Network as a ranking of the relative imperilment of species on global, national and/or regional levels. It is also called 'TNC ranks' or the 'NatureServe status'.
In the system, 'G' codes refer to rankings made at the global level (G-rank), 'N' codes refer to rankings made at a national level (N-rank) and 'S' codes refer to rankings made at the sub-regional level (S-rank), such as states within the US:

★ X - presumed extinct (not located despite extensive searches)

★ H - possibly extinct [or h historical occurrence (still some hope of discovery)]

★ 1 - critically imperilled (typically five or fewer occurrences or 1,000 or fewer individuals)

★ 2 - imperilled (typically six to twenty occurrences or 1,000 to 3,000 individuals)

★ 3 - vulnerable (rare; typically 21 to 100 occurrences or 3,000 to 10 000 individuals)

★ R or ? - Recorded within nation or state, but local status not available; when combined with global rank of G1 to G3, local status is 'Indeterminate'

★ 4 - Apparently secure (uncommon but not rare; some cause for long-term concern, usually more than 100 occurrences and 10,000 individuals)

★ 5 - Secure (common, widespread and abundant)
Thus, for example, a G3 species is "globally vulnerable", and an N2 species is "nationally imperilled" for whatever country the rank is assigned. Species with G, N, or S rankings of 4 or 5 are generally not the basis for major conservation actions.
Infraspecific taxa (subspecies, varieties and other designations below the level of the species) can also be assigned 'T-ranks', which is appended to the G-rank.

Contents

See also

External link and references

See also

★ Conservation status

External link and references

★ http://www.natureserve.org/explorer/ranking.htm

★ http://www.unep-wcmc.org/species/plants/status_tnc.htm

★ http://www.natureserve.org/infonatura/Ldtypes.htm

★ http://www.natureserve.org/infonatura/Lnsstatus.htm