COSEWIC Assessment and Update Status Report on the Bering Cisco 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
- Technical Summary
- Acknowledgements and Information Sources
- Biographical Summary of Report Writer and Authorities Contacted and Personal Communications
Range of Occurrence in Canada: Yukon Territory
Extent and Area Information
Extent of occurrence (EO)
[estimated from Figure 2]
Trend in EO
Are there extreme fluctuations in EO?
Area of occupancy AO
[estimated from Figure 2, the river is nowhere more than 1 km wide]
Trend in AO
Are there extreme fluctuations in AO?
Number of known or inferred current locations (see Figure 2)
Trend in # locations
Are there extreme fluctuations in # locations?
In area, extent or quality of habitat?
Unknown, but probably Stable
Generation time (average age of parents in the population)
Number of mature individuals
Total population trend
% decline over the last/next 10 years or 3 generations
Are there extreme fluctuations in number of mature individuals?
Is the total population severely fragmented?
Trend in number of populations
Are there extreme fluctuations in number of populations?
List populations with number of mature individuals in each
Threats (actual or imminent threats to populations or habitats)
- low to moderate, possibility of increased oil development and habitat alterations in coastal regions throughout its range
- potential for hydroelectric development on rivers where they are known to migrate
- potential for increased commercial utilization
- possible threats to the species in Canadian waters would be related to harvest and any activities which might restrict migration such as the building of power dams.
Rescue Effect: High
Status of the outside population(s)?
Is immigration known or possible?
Not known if Canadian migrants are separate stock from US population
Would immigrants be adapted to survive in Canada?
Is there sufficient habitat for immigrants here?
Nature Conservancy Ranks
Global – N4
US – N4
Canada – N1
US – Alaska – S?
Canada – Yukon S?
COSEWIC – Data Deficient, 1990
Status and Reasons for Designation
Status: Special Concern
Alpha-numeric code: Not applicable
Reasons for Designation: This is an anadromous species that depends on barrier-free access to upstream spawning sites. In Canada, it is known only from the Yukon River. The numbers utilizing Canadian portions of the Yukon River are low compared to lower sections of the river in United States parts of the range and could be negatively impacted by hydroelectric development and expansion of commercial or subsistence fisheries, targeting other species in the river.
Applicability of Criteria
Criterion A (Declining Total Population):
Not applicable, no evidence of population decline.
Criterion B (Small Distribution, and Decline or Fluctuation):
Not applicable, although the species has a small Canadian distribution, its extent and nature of the range is uncertain, and there is no evidence of decline or fluctuation.
Criterion C (Small Total Population Size and Decline):
Not applicable, population size and trends not known. Numbers counted annually since the 1980s have been low, but counting is not consistent and the species may be easily confused with other sympatric coregonids.
Criterion D (Very Small Population or Restricted Distribution):
Not applicable. Although the species does meet the numeric thresholds under Threatened D2, i.e., restricted distribution, known only from 1 location. However, there are no immediate threats exposing the species to imminent extirpation and there is a high potential for rescue from U.S. populations.
Criterion E (Quantitative Analysis):
Not applicable, - no data.
- Date Modified: