Key to Codes Used by the Nevada Natural Heritage Program
Note: The Nevada Natural Heritage Program makes every effort to keep other agency statuses current; however we recommend you consult the agency to ensure you have the most current information.
NatureServe (Heritage Program) Conservation Status Rank Definitions
Definition – see http://www.natureserve.org/explorer/ranking.htm for more detailed information.
Refers to the global population of a species.
Refers to the subspecific or variety taxonomic level (used in conjunction with Grank); uses numeric ranks 1-5 in the same way that G and S ranks are applied.
|S||Refers to the subnational (state) population of a species, subspecies, or variety.|
Presumed Extinct or extirpated (Srank) – Not located despite intensive searches and virtually no likelihood of rediscovery.
Possibly Extinct – Known from only historical occurrences but still some hope of rediscovery.
Critically Imperiled – At very high risk of extirpation in the jurisdiction due to very restricted range, very few populations or occurrences, very steep declines, severe threats, or other factors.
Imperiled – At high risk of extirpation in the jurisdiction due to restricted range, few populations or occurrences, steep declines, severe threats, or other factors.
Vulnerable – At moderate risk of extirpation in the jurisdiction due to a fairly restricted range, relatively few populations or occurrences, recent and widespread declines, threats, or other factors.
Apparently Secure – At fairly low risk of extirpation in the jurisdiction due to an extensive range and/or many populations or occurrences, but with possible cause for some concern as a result of local recent declines, threats, or other factors.
Secure – At very low or no risk of extirpation in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats.
Range Rank – A numeric range rank (e.g., S2S3 or S1S3) is used to indicate uncertainty about the exact status of a taxon. Ranges cannot skip more than two ranks (e.g., SU is used rather than S1S4). A range rank could also be applied at the global scale as well (e.g., G2G3).
Taxon Not Ranked – rank not yet assessed.
Conservation status rank is Not Applicable because element is not a suitable target for conservation activities (often used for non-native species or hybrids).
Unrankable – Currently unrankable due to lack of information or due to substantially conflicting information about status or trends.
Questionable taxonomy – taxonomic distinctiveness of the entity at the current level is questionable or currently being reviewed; resolution of this uncertainty may result in change from a species to a subspecies, variety or hybrid, or the inclusion of this taxon in another taxon, with the resulting taxon having a lower-priority conservation status.
Breeding – Conservation status refers to the breeding population of the element in the nation or state/province.
Non-breeding – Conservation status refers to the non-breeding population of the element in the nation or state/province (e.g., wintering bird populations).
Migrant – Migrant species occurring regularly on migration at particular staging areas or concentration spots where the species might warrant conservation attention. Conservation status refers to the aggregating transient population of the species in the nation or state/province.
Nevada Natural Heritage Program Tracking Status
Tracked as an at-risk species on NNHP’s Animal and Plant At-Risk Tracking List.
Maintained on NNHP’s Animal and Plant Watch List; data passively accumulated.
Not tracked as an at-risk species or maintained on the Watch List.
U.S. Fish and Wildlife Service (FWS) Endangered Species Act Listing
Status Under the U.S. Endangered Species Act (ESA)
Listed Endangered – in danger of extinction in all or a significant portion of its range.
Listed Threatened – likely to be classified as Endangered in the foreseeable future if threats continue.
PE or PT
Proposed as Endangered or Threatened
Candidate for listing as Threatened or Endangered
Species of Concern (former Category 1 Candidate or proposed species)
Proposed for delisting
SAE or SAT
Listed Endangered or Threatened because of similarity of appearance
PSAE or PSAT
Proposed Endangered or Threatened because of similarity of appearance
Essential experimental population
Non-essential experimental population
U.S. Bureau of Land Management (BLM) Status
Sensitive Species – Species designated Sensitive by State Director of Nevada BLM.
California BLM state status (sensitive)
U.S. Forest Service (FS) Status
Endangered – as designated by the Endangered Species Act
Threatened – as designated by the Endangered Species Act
Region 4 (Humboldt-Toiyabe National Forest) Sensitive
Region 5 (Inyo National Forest or Lake Tahoe Basin Management Unit) Sensitive or Watch status
Region 5 (Inyo National Forest [includes Lake Tahoe Basin Management Unit]) proposed Sensitive or Watch status
State of Nevada Protection and Designations (NAC 503)
Nevada State Emblem
Critically Endangered Plant
Recommended for listing as Critically Endangered Plant
Protected as a cactus, yucca, or Christmas tree
Game Fish (NAC 503.060)
Protected Fish (NAC 503.065.1)
Sensitive Fish (NAC 503.067)
Threatened Fish (NAC 503.065.3)
Endangered Fish (NAC 503.065.2)
Protected Amphibian (NAC 503.075.2)
Protected Reptile (NAC 503.080.1)
Threatened Reptile (NAC 503.080.2)
Unprotected Birds (NAC 503.055)
Game Bird (NAC 503.045)
Protected Birds (NAC 503.050.1)
Sensitive Birds (NAC 503.050.3)
Endangered Birds (NAC 503.050.2)
Unprotected Mammal (NAC 503.035)
Game Mammal (NAC 503.020)
Fur-bearing Mammal (NAC 503..025)
Protected Mammal (NAC 503.030.1)
Sensitive Mammal (NAC 503.030.3)
Threatened Mammal (NAC 503.030.2)
Endemic to Nevada Status
Found naturally only in the State of Nevada
Probable endemic of Nevada
Not endemic to Nevada
Habitat Status – Taxon dependency on Wetlands
Taxon requires aquatic or wetland habitats (open water, or hydric vegetation and at least seasonally saturated soil) for its survival, either always or at one or more critical life stages.
Taxon is usually or always found around the margins of wetland habitats but does not directly use such habitats.
Habitat Status – Taxon dependency on Sand Dunes
Taxon is dependent upon sand dunes or strongly associated with sand dunes (i.e. found on dune skirts or extensive deep-sand deposits).
Taxon is possibly dependent upon sand dunes or deep-sand deposits.
Nevada Native Plant Society (NNPS) Status
Status designated by NNPS
Reported erroneously from Nevada or further examination of species showed it to be a different species; previously with another status but now not of concern.
Delisted, dropped from consideration, no longer of concern.
Endangered, believed to meet the ESA definition of Endangered but not formally listed.
Marginal/disjunct, rare and/or possibly distinct, and potentially vulnerable in the Nevada portion of its range, but much more widespread and secure outside Nevada.
Possibly Extirpated, historically native to Nevada, but may no longer survive in the wild.
Threatened, believed to meet the ESA definition of Threatened but not formally listed.
Watch List species, potentially vulnerable to becoming Threatened or Endangered.
Research needed – Possibly rare but more information is needed to make the determination.
International Union for Conservation of Nature (IUCN) Status
Select IUCN Statuses as applied to Nevada taxa (IUCN Red List Categories and Criteria, V 3.1, second edition)
Critically Endangered – taxon faces an extremely high risk of extinction in the wild
Endangered – taxon faces a very high risk of extinction in the wild
Vulnerable - taxon faces a high risk of extinction in the wild
Near Threatened – likely to qualify for a threatened category in the near future
Least Concern – widespread and abundant
Climate Change Vulnerability Index (CCVI)
CCVI score as assessed by the Nevada Natural Heritage Program for taxon within the state of Nevada
Extremely Vulnerable: Abundance and/or range extent within Nevada extremely likely to substantially decrease or disappear by 2050.
Highly Vulnerable – Abundance and/or range extent within Nevada likely to decrease significantly by 2050.
Moderately Vulnerable- Abundance and/or range extent with Nevada assessed likely to decrease by 2050.
Presumed Stable – Available evidence does not suggest that abundance and/or range extent within Nevada will change.
Increase Likely – Available evidence suggests that abundance and/or range extent within Nevada is likely to increase by 2050.
Insufficient Evidence – Available information about a species’ vulnerability is inadequate to calculate an Index score.
Group and status assigned
American Fisheries Society – Threatened
Audubon Watchlist 2007 – Red List – species is declining rapidly and/or have very small populations or limited ranges, and face major conservation threats; typically species of global conservation concern.
Audubon Watchlist 2007 – Yellow List – Species that are either declining or rare; typically species of national conservation concern.
Nevada Wildlife Action Plan – 2012 – Species of Conservation Priority
Nevada Wildlife Action Plan – 2005 – Species of Conservation Priority
Nevada Partners in Flight – Priority Bird Species