Michigan's Natural Communities
Code Definitions
- Palustrine Class
- Palustrine/Terrestrial Class
- Primary Class
- Subterranean/Sink Class
- Terrestrial Class
- G1
- Critically imperiled globally because of extreme rarity (5 or fewer occurrences range-wide or very few remaining individuals or acres) or because of some factor(s) making it especially vulnerable to extinction.
- G2
- Imperiled globally because of rarity (6 to 20 occurrences or few remaining individuals or acres) or because of some factor(s) making it very vulnerable to extinction throughout its range.
- G3
- Either very rare and local throughout its range or found locally (even abundantly at some of its locations) in a restricted range (e.g. a single western state, a physiographic region in the East) or because of other factor(s) making it vulnerable to extinction throughout its range; in terms of occurrences, in the range of 21 to 100.
- G4
- Apparently secure globally, though it may be quite rare in parts of its range, especially at the periphery.
- G5
- Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
- GH
- Of historical occurrence throughout its range, i.e. formerly part of the established biota, with the expectation that it may be rediscovered (e.g. Bachman's Warbler).
- GU
- Possibly in peril range-wide, but status uncertain; need more information.
- GX
- Believed to be extinct throughout its range (e.g. Passenger Pigeon) with virtually no likelihood that it will be rediscovered.
- S1
- Critically imperiled in the state because of extreme rarity (5 or fewer occurrences or very few remaining individuals or acres) or because of some factor(s) making it especially vulnerable to extirpation in the state.
- S2
- Imperiled in state because of rarity (6 to 20 occurrences or few remaining individuals or acres) or because of some factor(s) making it very vulnerable to extirpation from the state.
- S3
- Rare or uncommon in state (on the order of 21 to 100 occurrences).
- S4
- Apparently secure in state, with many occurrences.
- S5
- Demonstrably secure in state and essentially ineradicable under present conditions.
- SX
- Apparently extirpated from state.
Citation
Cohen, J.G., M.A. Kost, B.S. Slaughter, D.A. Albert, J.M. Lincoln, A.P. Kortenhoven, C.M. Wilton, H.D. Enander, and K.M. Korroch. 2020. Michigan Natural Community Classification [web application]. Michigan Natural Features Inventory, Michigan State University Extension, Lansing, Michigan. Available https://mnfi.anr.msu.edu/communities/classification. (Accessed: April 28, 2024).