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Recovery Strategy for the Lake Chubsucker
Appendix A: Definition of Status Rankings
G-Rank (global): Rank assigned to an element based on its range-wide conservation status rank (G1 to G5, in decreasing order of priority). Elements ranked G1, G2 or G3 are considered imperilled. G-rank is assigned by NatureServe or the conservation data centre responsible for the element in question.
N-Rank (national): Rank assigned to an element based on its national conservation status rank (N1 to N5, in decreasing order of priority). Elements ranked N1, N2 or N3 are considered imperilled.
S-Rank (subnational): Rank assigned to element based on its provincial or state conservation status rank (S1 to S5, in decreasing order of priority. Elements ranked S1, S2 or S3 are considered imperilled).
|Priority ranking value||Priority ranking definition|
|S1(extremely rare)||Usually 5 or fewer occurrences in the province or very few remaining individuals; often especially vulnerable to extirpation.|
|S2 (very rare)||Usually between 5 and20 occurrences in the province or with many individuals in fewer occurrences; often susceptible to extirpation.|
|S3 (rare to uncommon)||Usually between 20 and100 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.|
|S4 (common)||apparently secure in Ontario; usually with more than 100 occurrences in the province.|
|S5 (very common)||demonstrably secure in Ontario.|
For more information on status ranks see: www.mnr.gov.on.ca/MNR/nhic/
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