Feeding Patterns of Barren-ground Grizzly Bears in the Central Canadian Arctic

ARCTIC ◽  
2002 ◽  
Vol 55 (4) ◽  
Author(s):  
Robert J. Gau ◽  
Ray Case ◽  
David F. Penner ◽  
Philip D. McLoughlin
Keyword(s):  
Canadian Arctic ◽  
Grizzly Bears ◽  
Feeding Patterns ◽  
Barren Ground

Hierarchical habitat selection by barren-ground grizzly bears in the central Canadian Arctic

Oecologia ◽  
2002 ◽  
Vol 132 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Philip D. McLoughlin ◽  
Ray L. Case ◽  
Robert J. Gau ◽  
Dean H. Cluff ◽  
Robert Mulders ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Canadian Arctic ◽  
Grizzly Bears ◽  
Barren Ground

scholarly journals Movements of Subadult Male Grizzly Bears, Ursus arctos, in the Central Canadian Arctic

2004 ◽  
Vol 118 (2) ◽  
pp. 239 ◽  
Author(s):  
Robert J. Gau ◽  
Philip D. McLoughlin ◽  
Ray Case ◽  
H. Dean Cluff ◽  
Robert Mulders ◽  
...  
Keyword(s):  
Home Range ◽  
Long Range ◽  
Rangifer Tarandus ◽  
Ursus Arctos ◽  
Canadian Arctic ◽  
Grizzly Bears ◽  
Home Ranges ◽  
Adult Males ◽  
Subadult Male ◽  
Daily Movement

Between May 1995 and June 1999, we equipped eight subadult male (3-5 yrs old) Grizzly Bears (Ursus arctos) with satellite radio-collars within a study area of 235,000 km2, centred 400 km northeast of Yellowknife, Northwest Territories, Canada. Subadult male annual home ranges were extraordinarily large (average = 11,407 km2, SE = 3849) due, in part, to their movement's occasional linear directionality. We believe their long-range linear movements may reflect some individuals tracking the migration of Caribou (Rangifer tarandus). Seasonal daily movement patterns were similar to adult males that were previously reported. The areas used by these bears are the largest ranges reported for any Grizzly Bears and the scale of their movements may put individual bears in contact with humans even when developments are hundreds of kilometres from the central home range of an animal.

Movement Patterns of Barren-Ground Wolves in the Central Canadian Arctic

2001 ◽  
Vol 82 (3) ◽  
pp. 867-876 ◽  
Author(s):  
L. R. Walton ◽  
H. D. Cluff ◽  
P. C. Paquet ◽  
M. A. Ramsay
Keyword(s):  
Canadian Arctic ◽  
Movement Patterns ◽  
Barren Ground

scholarly journals MOVEMENT PATTERNS OF BARREN-GROUND WOLVES IN THE CENTRAL CANADIAN ARCTIC

2001 ◽  
Vol 82 (3) ◽  
pp. 867 ◽  
Author(s):  
Lyle R. Walton ◽  
H. Dean Cluff ◽  
Paul C. Paquet ◽  
Malcolm A. Ramsay
Keyword(s):  
Canadian Arctic ◽  
Movement Patterns ◽  
Barren Ground

Geographic variation in caribou on the Canadian arctic islands

1982 ◽  
Vol 60 (10) ◽  
pp. 2442-2454 ◽  
Author(s):  
D. C. Thomas ◽  
P. Everson
Keyword(s):  
Geographic Variation ◽  
Rangifer Tarandus ◽  
Canadian Arctic ◽  
The Other ◽  
Long Bones ◽  
Body Measurements ◽  
Morphological Similarity ◽  
North Central ◽  
Barren Ground ◽  
Northern Regions

Analyses of body, leg bone, skull, and pelage data indicated a cline in the characters of caribou (Rangifer tarandus) from central Boothia Peninsula to the western Queen Elizabeth Islands. The main difference between the skulls of barren-ground caribou (R. t. groenlandicus) on central Boothia Peninsula and the more northerly Peary caribou (R. t. pearyi) was a shorter muzzle in the latter. Pelage tone was markedly lighter in Peary caribou and they were smaller in most body measurements, most notably in the length of long bones. Two major populations of Peary caribou were identified: one on the western Queen Elizabeth Islands (Parry Islands), the other on Somerset and Prince of Wales islands. Differences in skull size and form suggest that each population was composed of two or more subpopulations. The larger and darker R. t. groenlandicus occurred on north-central Boothia Peninsula and the two subspecies and apparent intergrades were present in winter on northern regions of the peninsula. The morphological similarity of Peary caribou on Somerset and Prince of Wales islands is explained by interisland movements resulting in genetic mixing. The same is true for caribou on the western Queen Elizabeth Islands and that population apparently has little genetic interchange with the other.

Demography of barren-ground grizzly bears

2003 ◽  
Vol 81 (2) ◽  
pp. 294-301 ◽  
Author(s):  
Philip D McLoughlin ◽  
Mitchell K Taylor ◽  
H Dean Cluff ◽  
Robert J Gau ◽  
Robert Mulders ◽  
...  
Keyword(s):  
Survival Rate ◽  
Litter Size ◽  
Birth Interval ◽  
Ursus Arctos ◽  
Survival Rates ◽  
Grizzly Bears ◽  
Adult Males ◽  
Barren Ground ◽  
Rate Of Increase ◽  
The Mean

Between May 1995 and June 1999, we equipped 81 barren-ground grizzly bears (Ursus arctos) with satellite radio collars within a study area of 235 000 km2, centred 400 km northeast of Yellowknife, Northwest Territories, Canada. We used data from radiotelemetry to estimate survival rates, reproductive parameters, and the finite rate of increase of the population (λ). The annual survival rate of adult females was estimated at 0.979 (95% confidence intervals (CI) = 0.955–0.998), while the survival rate of adult males was 0.986 (95% CI = 0.942–1.0). The cub survival rate was 0.737 (95% CI = 0.600–0.844) and the yearling survival rate was 0.683 (95% CI = 0.514–0.821). Cub litter size averaged 2.23 (SE = 0.13, n = 35), while yearling litter size decreased to a mean of 1.86 (SE = 0.12, n = 35). The mean litter size of females with 2-year-olds was 1.85 (SE = 0.15, n = 20). The mean birth interval was 2.8 years (SE = 0.3 years, n = 17). The mean reproductive interval, which is calculated by excluding the loss of whole litters from the sample, was 3.9 years (SE = 0.4 years, n = 9). Mean litter size divided by mean birth interval yielded an annual natality rate of 0.81 cubs per adult female per year. The mean age at first parturition was 8.1 years (SE = 0.5 years, n = 10). We believe the population to be currently stable or slightly increasing (λ = 1.033, 95% CI = 1.008–1.064).

Den selection by barren-ground grizzly bears, Mackenzie Delta, Northwest Territories

Polar Biology ◽  
2016 ◽  
Vol 40 (3) ◽  
pp. 503-516 ◽  
Author(s):  
Corey A. Smereka ◽  
Mark A. Edwards ◽  
Jodie Pongracz ◽  
Marsha Branigan ◽  
Nicholas W. Pilfold ◽  
...  
Keyword(s):  
Northwest Territories ◽  
Grizzly Bears ◽  
Mackenzie Delta ◽  
Barren Ground

scholarly journals Population Viability of Barren-ground Grizzly Bears in Nunavut and the Northwest Territories

ARCTIC ◽  
2003 ◽  
Vol 56 (2) ◽  
Author(s):  
Mitchell K. Taylor ◽  
H. Dean Cluff ◽  
Robert J. Gau ◽  
Robert Mulders ◽  
Ray L. Case ◽  
...  
Keyword(s):  
Northwest Territories ◽  
Population Viability ◽  
Grizzly Bears ◽  
Barren Ground

scholarly journals Recent Hybridization between a Polar Bear and Grizzly Bears in the Canadian Arctic

ARCTIC ◽  
2017 ◽  
Vol 70 (2) ◽  
pp. 151 ◽  
Author(s):  
Jodie D. Pongracz ◽  
David Paetkau ◽  
Marsha Branigan ◽  
Evan Richardson
Keyword(s):  
Polar Bear ◽  
Canadian Arctic ◽  
The Arctic ◽  
F1 Hybrids ◽  
Grizzly Bears ◽  
Grizzly Bear ◽  
Single Female ◽  
Extensive Discussion ◽  
Female Polar Bear ◽  
The Impact

Grizzly bears have recently become more common on the Arctic Islands in the Inuvialuit Settlement Region, concurrently with a period of environmental change. Over the last decade, grizzly bear – polar bear hybrids have been confirmed within this region, triggering extensive discussion and speculation regarding the impact of hybridization on the parent species. Through harvests, sightings, and captures, we document an increase in the presence of grizzly bears and combine field observations of hybrids with genetic analysis and parentage analysis to identify four first-generation (F1) hybrids and four offspring of F1 hybrids and grizzly bears (backcross-to-grizzly-bear individuals). We trace these eight hybrid individuals to a single female polar bear who mated with two grizzly bears. We sampled one of her mates on the sea ice in the High Arctic and deduced the genotype of the other from his five offspring. The two male grizzly bears are sires of both the F1 generation and the backcross-to-grizzly-bear generation. So what initially appeared to be a sudden spate of hybridization in the western Canadian Arctic originated with the unusual mating between three non-hybrid parents. The breakdown of species barriers may start with atypical mating preferences of select individuals; however, the story we present can be traced to a single female polar bear who, along with three of her known F1 offspring, has been killed.

Sign in / Sign up

Export Citation Format

Share Document