1984-2004
  • CAROLINIAN CANADA

Natural Heritage Information Centre

Provincial Rank (SRANK)

SRANK Definition
S1 Extremely rare in Ontario; usually 5 or fewer occurrences in the province or very few remaining individuals; often especially vulnerable to extirpation.
S2 Very rare in Ontario; usually between 5 and 20 occurrences in the province or with many individuals in fewer occurrences; often susceptible to extirpation.
S3 Rare to uncommon in Ontario; usually between 20 and 100 occurrences in the province; may have fewer occurrences, but with a large number of individuals in some populations; may be susceptible to large-scale disturbances. Most species with an S3 rank are assigned to the watch list, unless they have a relatively high global rank.
S4 Common and apparently secure in Ontario; usually with more than 100 occurrences in the province.
S5 Very common and demonstrably secure in Ontario.
SH Historically known from Ontario, but not verified recently (typically not recorded in the province in the last 20 years); however suitable habitat is thought to be still present in the province and there is reasonable expectation that the species may be rediscovered.
C Captive/Cultivated; existing in the province only in a cultivated state; introduced population not yet fully established and self-sustaining.
S? Not Ranked Yet, or if following a ranking, Rank Uncertain (e.g. S3?). S? species have not had a rank assigned.
SA Accidental; of accidental or casual occurrence in the province; far outside its normal range; some species may occasionally breed in the province.
SAB Breeding accidental.
SAN Non-breeding accidental.
SE Exotic; not believed to be a native component of Ontario's flora.
SR Reported for Ontario, but without persuasive documentation which would provide a basis for either accepting or rejecting the report.
SRF Reported falsely from Ontario.
SU Unrankable, often because of low search effort or cryptic nature of the species, there is insufficient information available to assign a more accurate rank; more data is needed.
SX Apparently extirpated from Ontario, with little likelihood of rediscovery. Typically not seen in the province for many decades, despite searches at known historic sites.
SZ Not of practical conservation concern inasmuch as there are no clearly definable occurrences; applies to long distance migrants, winter vagrants, and eruptive species, which are too transitory and/or dispersed in their occurrence(s) to be reliably mapped; most such species are non-breeders, however, some may occasionally breed.
SZB Breeding migrants/vagrants.
SZN Non-breeding migrants/vagrants.

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