Shortjaw cisco COSEWIC assessment and status report: chapter 14
Technical Summary
Coregonus zenithicus
Shortjaw Cisco – Cisco à mâchoires égales
Rangeof Occurrence in Canada
NT, AB, SK, MB, ON
Extent and Area Information
Extent of occurrence
>1 x 106 km²
Area of occupancy:
>175,000 km²
Trend
Declining
Number of extant locations:
20-21
Number of historic locations from which the species
has been extirpated
has been extirpated
2 possibly 3
Habitat trend
Decline in extent and quality of habitat in some areas
Population Information
Number of mature (capable of reproduction)
individuals in the Canadian population:
individuals in the Canadian population:
Unknown
Generation time:
5 years
Population trend:
Declining
Rate of decline:
Current rate is not known, but historic decline is >30%
Is population fragmented?
Yes
Number of individuals in each sub-population
Unknown
Does the species undergo fluctuations?
Not known to occur
Threats
Food fisheries; habitat loss and degradation resulting from urban, agriculture and industrial activities; introductions of exotic species; sea lamprey predation; and population destabilization resulting from climatic change, and introgressive hybridization. Populations are fragmented and fringe populations are in decline so therefore no rescue effect, especially as only remaining U.S. populations are those in Lake Superior which are probably endangered (A4a-e).
Rescue Potential
Negligible
Does the species exist elsewhere?
No
Is immigration known or possible?
No
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