Arkansas Heritage Program
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State Ranks

S1 = Extremely rare. Typically 5 or fewer estimated occurrences in the state, or only a few remaining individuals, may be especially vulnerable to extirpation.
S2 = Very rare. Typically between 5 and 20 estimated occurrences or with many individuals in fewer occurrences, often susceptible to becoming extirpated.
S3 = Rare to uncommon. Typically between 20 and 100 estimated occurrences, may have fewer occurrences but with large number of individuals in some populations, may be susceptible to large-scale disturbances.
S4 = Common, apparently secure under present conditions. Typically 100 or more estimated occurrences, but may be fewer with many large populations, may be restricted to only a portion of the state, usually not susceptible to immediate threats.
S5 = Demonstrably widespread, common, and secure in the state and essentially ineradicable under present conditions.
SA = Accidental.
SH = Historically known from the state, but not verified for an extended period, usually 15 years.
SU = Possibly in peril in the state, but status uncertain, more information is needed.
SX = Apparently extirpated from state.
SZ = Zero occurrences. Not of practical conservation concern in the state because there are no definable occurrences, although the taxa is native and appears regularly in the state.

General Ranking Notes
Q = A "Q" in the global rank indicates the element's taxonomic classification as a species is a matter of conjecture among scientists.
RANGES = Ranges are used temporarily until a final rank decision can be made.
? = A question mark is used temporarily when there is some indecision regarding the rank assignment or when an element has not been ranked.
B = Breeding status
N = Non-breeding status

Arkansas Natural Heritage Commission

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