2006-12-18_REVISION - M1978314 (3)

Home Browse Search

APPENDIX 2B FEDERAL AND COLORADO NATURAL HERITAGE PROGRAM SPECIES STATUS CODE DEFINITIONS Federal Status: U.S. Fish and Wildlife Service (Endangered and threatened wildlife and plants. 50 CFR 17.11 and 17.12, 1993) LE Listed Endangered: defined as a species, subspecies, or variety in danger of extinction throughout all or a significant portion of its range. LT Listed Threatened: defined as a species, subspecies, or variety likely to become endangered in the foreseeable future throughout all or a significant portion of its range. C Candidate: taxa with sufficient information on biological vulnerability and threat(s) to support proposing to list as endangered or threatened. Colorado Natural Heritage Program (CNHP) Imperilment Ranks State imperilment ranks are based on the status of a species in an individual state. These ranks should not be interpreted as legal designations. S1 Critically imperiled globally/state because of rarity (5 or fewer occurrences in the world/state; or 1,000 or fewer individuals), or because some factor of its biology makes it especially vulnerable to extinction. S2 Imperiled globally/state because of rarity (6 to ZO occurrences, or 1,000 to 3,000 individuals), or because other factors demonstrably make it very vulnerable to extinction throughout its range. S3 Vulnerable through its range or found locally in a restricted range (21 to 100 occurrences, or 3,000 to 10,000 individuals). S4 Apparently secure globally/state, though it may be quite rare in parts of its range, especially at the periphery. Usually more than 100 occurrences and 10,000 individuals. SS Demonstrably secure globally/state, though it may be quite rare in parts of its range, especially at the periphery. SX Presumed extinct globally, or extirpated within the state. SU Unable to assign rank due to lack of available information. SH Historically known, but usually no[ verified for an extended period of time. B Refers to [he breeding season imperilment of elements [hat are not permanent residents. N Refers to the non-breeding season imperilment of elements that are not permanent residents. Where no consistent location can be discerned for migrants or non-breeding populations, a rank of SZN is used. S? Indicates uncertainty about an assigned state rank. Note: Where two numbers appear in a state or global rank (for example, S2S3), the actual rank of the element falls between the two numbers.