The term "species of conservation concern" includes species that are rare, disjunct, or at risk throughout their range or in Manitoba and in need of further research. The term also encompasses species that are listed under the Manitoba Endangered Species Act (MBESA), or that have a special designation by the Committee On the Status of Endangered Wildlife In Canada (COSEWIC).
Species are evaluated and ranked by the Conservation Data Centre on the basis of their range-wide (global - G) status, and their province-wide (subnational - S) status according to a standardized procedure used by all Conservation Data Centres and Natural Heritage Programs. These ranks are used to determine protection and data collection priorities, and are revised as new information becomes available.
For each level of distribution—global and provincial—species are assigned a numeric rank ranging from 1 (very rare) to 5 (demonstrably secure). This reflects the species’ relative endangerment and is based primarily on the number of occurrences of that species globally or within the province. However, other information, such as date of collection, degree of habitat threat, geographic distribution patterns and population size and trends, is considered when assigning a rank. The number of occurrences listed below are suggestions, not absolute criteria.
For example, the Green Frog (Rana clamitans) is ranked G5, S2. That is, globally the species is abundant and secure, while in Manitoba it is rare and may be vulnerable to extirpation.
|1||Very rare throughout its range or in the province (5 or fewer occurrences, or very few remaining individuals). May be especially vulnerable to extirpation.|
|2||Rare throughout its range or in the province (6 to 20 occurrences). May be vulnerable to extirpation.|
|3||Uncommon throughout its range or in the province (21 to 100 occurrences).|
|4||Widespread, abundant, and apparently secure throughout its range or in the province, with many occurrences, but the element is of long-term concern
(> 100 occurrences).
|5||Demonstrably widespread, abundant, and secure throughout its range or in the province, and essentially impossible to eradicate under present conditions.|
|U||Possibly in peril, but status uncertain; more information needed.|
|H||Historically known; may be rediscovered.|
|X||Believed to be extinct; historical records only, continue search.|
|SNR||A species not ranked. A rank has not yet assigned or the species has not been evaluated.|
|SNA||A conservation status rank is not applicable to the element.|
|Numeric range rank: A range between two of the numeric ranks. Denotes range of uncertainty about the exact rarity of the species.|
|T||Rank for subspecific taxon (subspecies, variety, or population); appended to the global rank for the full species, e.g. G4T3.|
|B||Breeding status of a migratory species. Example: S1B,SZN - breeding occurrences for the species are ranked S1 (critically imperilled) in the province, nonbreeding occurrences are not ranked in the province.|
|N||Non-breeding status of a migratory species. Example: S1B,SZN - breeding occurrences for the species are ranked S1 (critically imperilled) in the province, nonbreeding occurrences are not ranked in the province.|
|Q||Taxonomic questions or problems involved, more information needed; appended to the global rank.|
|T||Rank for subspecific taxon (subspecies, variety, or population); appended to the global rank for the full species.|
|#||A modifier to SX or SH; the species has been reintroduced but the population is not yet established.|
|?||Inexact or uncertain; for numeric ranks, denotes inexactness.|