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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