Grizzly bear (Ursus arctos) COSEWIC assessment and update update status report: chapter 11
11. Technical summary
Technical summary – North-western population
Ursus arctos
Grizzly bear
North-western population
Grizzly bear
North-western population
Ours brun
Population du Nord-Ouest
British Columbia (BC), Alberta (AB), Yukon Territory (YT), Northwest Territories (NT), Nunavut (NU)
Distribution
Extent of occurrence:
3 470 000 km 2
Area of occupancy:
2 574 000 km 2
Population information
Total number of individuals in the population:
26 916+ to 29 150+
Number of mature reproducing individuals in the population:
6 890+ to 17 199+
Generation time:
10-15 years
Total population trend:
stable
Rate of decline for total population:
n/a
Number of known populations:
1
Is the total population fragmented?
No
number of individuals in smallest population:
number of individuals in largest population:
number of extant sites:
number of historic sites from which species has been extirpated:
Does the species undergo fluctuations in numbers?
No
If yes, what is the maximum number?
minimum number?
Are these fluctuations greater than one order of magnitude?
Limiting factors and threats
- Hunting, poaching, accidental killing, nuisance/self-defence killing.
- Conversion of habitat from useable to permanently unsuitable.
- Development of access (especially roads) into previously inaccessible areas. Human activity associated with access into grizzly habitat degrades habitat effectiveness, reduces habitat security, and increases mortality risk for bears.
- Fragmentation and isolation of small populations at southern and eastern edges of current geographical range.
Rescue potential
Does the species exist outside Canada?
Yes
Is immigration known or possible?
Yes
Would individuals from the nearest foreign population be adapted to survive in Canada?
Yes
Would sufficient suitable habitat be available for immigrants?
Yes
Technical summary – Prairie population
Ursus arctos
Grizzly bear
Prairie population
Grizzly bear
Prairie population
Ours brun
Population des Prairies
Alberta (AB), Saskatchewan (SK), Manitoba (MB)
Distribution
Extent of occurrence:
formerly 400 000 km 2
Area of occupancy:
currently none
Population information
Total number of individuals in the population:
0
Number of mature reproducing individuals in the population:
0
Generation time:
10-15 years
Total population trend:
n/a
Rate of decline for total population:
n/a
Number of known populations:
formerly 1
Is the total population fragmented?
n/a
number of extant sites:
0
number of historic sites from which species has been extirpated:
1
Does the species undergo fluctuations in numbers?
n/a
Are these fluctuations greater than one order of magnitude?
n/a
Limiting factors and threats
- Hunting, poaching, accidental killing, nuisance/self-defence killing.
- Conversion of habitat to agricultural, residential and urban areas.
- The last individuals of this population disappeared from the Cypress Hills area around 1900.
Rescue potential
Does the species exist outside Canada?
Yes
Is immigration known or possible?
No
Would individuals from the nearest foreign population be adapted to survive in Canada?
Yes
Would sufficient suitable habitat be available for immigrants?
No
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