Fourhorn sculpin COSEWIC assessment and status report: chapter 12
Technical Summary
Myoxocephalus quadricornis
Fourhorn sculpin – chaboisseau à quatre cornes
Range of Occurrence in Canada:
High Arctic lakes in Northwest and Nunavut Territories; one lake in Newfoundland and Labrador
Extent and Area Information
Extent of occurrence (EO) (km²) :
High Arctic lakes of northern Canada
Specify trend in EO :
Unknown
Are there extreme fluctuations in EO?
Unknown
Area of occupancy (AO) (km²) :
Unknown
Specify trend in AO :
Unknown
Are there extreme fluctuations in AO?
Unknown
Number of known or inferred current locations :
At least 23 lakes
Specify trend in # :
Unknown
Are there extreme fluctuations in number of locations?
Unknown
Specify trend in area, extent or quality of habitat :
Stable
Population Information
Generation time (average age of parents in the population) :
Unknown, possibly less than 5 years
Number of mature individuals :
Unknown
Total population trend:
Unknown
% decline over the last/next 10 years or 3 generations.
Unknown
Are there extreme fluctuations in number of mature individuals?
Unknown
Is the total population severely fragmented?
Unknown
Specify trend in number of populations:
Unknown
Are there extreme fluctuations in number of populations?
Unknown
List populations with number of mature individuals in each:
Threats (actual or imminent threats to populations or habitats)
Rescue Effect (immigration from an outside source)
Status of outside population(s)?
USA: occurs in a few lakes; populations appear stable
Sweden: rare in some lakes in Sweden (listed EN)
Is immigration known or possible?
No
Would immigrants be adapted to survive in Canada?
Probably Yes
Is there sufficient habitat for immigrants in Canada?
Probably Yes
Is rescue from outside populations likely?
Probably Yes
Quantitative Analysis
Unknown
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