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COSEWIC assessment and update status report on the Atlantic Cod in Canada

Technical Summary: Arctic Population


[Scientific name] Gadus morhua
[Common name  (English)]  Atlantic cod        [Common name (French)]  Morue franche
[Population name]  Arctic Population
[Range of Occurrence in Canada (by province / territory / ocean)]  Nunavut / Arctic Ocean

Extent and Area information

·        extent of occurrence (EO)(km²)
                Marine portion:  approx. 50,000 km2;
                Lakes portion: < 100 km2
·        specify trend (decline, stable, increasing, unknown)        Unknown
·        are there extreme fluctuations in EO (> 1 order of magnitude)?        Unlikely
·        area of occupancy (AO) (km²)
                Marine portion: unknown
                Lakes portion:  < 100 km2
·        specify trend (decline, stable, increasing, unknown)        Unknown
·        are there extreme fluctuations in AO (> 1 order magnitude)?        Unlikely
·        number of extant locations
               Marine portion:  unknown
                Lakes portion:  5-7
·        specify trend in # locations (decline, stable, increasing, unknown)        Stable
·        are there extreme fluctuations in # locations (>1 order of magnitude)?        Unlikely
·        habitat trend:  specify declining, stable, increasing or unknown trend in area, extent or quality of habitat        Unknown

Population information

·        generation time (average age of parents in the population) (indicate years, months, days, etc.)
                Marine portion:  unknown
                Lakes portion:  > 8 years
·        number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)
                Marine portion:  unknown
                Lakes portion:  probably  numbering in the hundreds in each lake
·        total population trend:  specify declining, stable, increasing or unknown trend in number of mature individuals
                Unknown
·        if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)
                Unknown
·        are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?        Unlikely
·        is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., < 1 successful migrant / year)?
                Marine portion:  Unlikely
                Lakes portion:  Yes; the probability of migration among lakes, or between the lakes and marine portions of the population, is probably nil
·        list each population and the number of mature individuals in each
                Lakes portion:
                 Ogac (~ 500); Qasigialiminiq;
                 Tariuja;
                 unnamed lake on Qikiqtarjuaq;
                 unnamed lake on Beekman Peninsula;
                 unnamed lake near Burwell;
                 unnamed lake on Resolution Island
·        specify trend in number of populations (decline, stable, increasing, unknown)        Unknown
·        are there extreme fluctuations in number of populations (>1 order of magnitude)?        Unlikely

Threats (actual or imminent threats to populations or habitats) [add rows as needed]

- increased angling pressure in some lakes
- small population sizes

Rescue Effect (immigration from an outside source)
                Marine portion:  low
                Lakes portion:  none
·        does species exist elsewhere (in Canada or outside)?        Yes
·        status of the outside population(s)?        Newfoundland & Labrador Population is at historically low levels; Greenland cod are also at historically low levels
·        is immigration known or possible?        Possible for marine portion; not possible for lakes portion
·        would immigrants be adapted to survive here?        Probably
·        is there sufficient habitat for immigrants here?        Probably

Quantitative Analysis        None