COSEWIC assessment and status report on the Alkaline Wing-nerved Moss in Canada
- Assessment Summary
- Executive Summary
- COSEWIC History, Mandate, Membership and Definitions
- Lists of Figures and Tables
- Species Information
- Population Sizes and Trends
- Limiting Factors and Threats
- Special Significance of the Species
- Existing Protection or Other Status
- Summary of Status Report
- Technical Summary
- Acknowledgements, Authorities Contacted, and Information Sources
- Biographical Summary of Report Writer and Collections Examined
Range of Occurrence in Canada: BC, SK.
Extent and Area Information
Based on estimate of areas searched.
13 extant of which 9 were first found in 2002;
3 not relocated; 3 not visited
(See Table 2)
Threats (actual or imminent threats to populations or habitats)
Impacts of cattle; it is not known what level of disturbance the species can withstand and continue to persist at a site.
Development, road building, off road vehicles.
Rescue Effect (immigration from an outside source)
imperiled in Mongolia
Status and Reasons for Designation
Reasons for Designation: This species, restricted in North America to western Canada, is globally imperiled or rare. Canada possesses the great majority of documented locations. The species typically grows on soil among grasses and sedges along the margins of alkaline ponds and sloughs in semi-arid regions of Canada. It has been confirmed at only 13 sites from 24 reported in south central British Columbia. There is one unconfirmed site in Saskatchewan. About half of all the known sites are subject to impacts from people and domestic animals. Of the British Columbia sites, 6 have apparently been lost to urban development, highway improvement, and trampling by cattle, implying that decline in habitat quality and extent are presently impacting the species.
Applicability of Criteria
Criterion A: (Declining Total Population):
Does not meet thresholds for decline.
Criterion B: (Small Distribution, and Decline or Fluctuation):
Meets criteria for Threatened B1 (Area of Occupancy is estimated at < 40 km2). The Canadian population is severely fragmented (a), and there is a decline in the area, extent and /or quality of habitat (b iii), and number of locations (b iv).
Criterion C: (Small Total Population Size and Decline):
Information not available for total population size.
Criterion D: (Very Small Population or Restricted Distribution):
Does not meet requirements for this criterion. No population estimates.
Criterion E: (Quantitative Analysis):
- Date Modified: