Western silvery minnow (Hybognathus argyritis) COSEWIC assessment and status report: chapter 1
COSEWIC Assessment Summary
Assessment Summary – April 2008
Common name : Western silvery minnow
Scientific name : Hybognathus argyritis
Status : Endangered
Reason for designation : This small minnow species is restricted to the Milk River in Southern Alberta, a region characterized by drought conditions of increasing frequency and severity. While the future of flow regimes associated with the St. Mary’s diversion canal and proposed water storage projects are uncertain, consequences of these activities have the potential to significantly affect the survival of the species. Rescue effect from U.S. populations is not possible.
Occurrence : Ontario
Status history : Designated Special Concern in April 1997. Status re–examined and designated Threatened in November 2001. Status re–examined and designated Endangered in April 2008. Last assessment based on an update status report.
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