The Present Status of the Polar Bear in the James Bay and Belcher Islands Area, by Charles Jonkel, Pauline Smith, Ian Stirling & George B. Kolenosky. Canadian Wildlife Service, Occasional Paper No. 26, 42 pp., figs & tables, 22.9 × 16.4 × 0.4 cm, paperbound [no price indicated], 1976. - The Ecology of the Polar Bear (Ursus maritimus) along the Western Coast of Hudson Bay, by Ian Stirling, Charles Jonkel, Pauline Smith, Richard Robertson & Dale Cross. Canadian Wildlife Service, Occasional Paper No. 33, 64 pp., figs & tables, 28.5 × 16.5 × 0.5 cm, paperbound [no price indicated], 1977. - Dynamics of Snowshoe Hare Populations in the Maritime Provinces, by Thomas J. Wood & Stanley A. Munroe. (Canadian Wildlife Service, Occasionel Paper Number 30.) Minister of Supply and Services, Ottawa, Canada: 21 pp., figs & tables, 23 × 16 × 0.2 cm, paper cover [no price indicated], 1977. - Peary Caribou and Muskoxen on Western Queen Elizabeth Islands, NWT, 1972–74, by F. L. Miller, R. H. Russell & Anne Gunn. (Canadian Wildlife Service Report Series No. 40.) Printing and Publishing, Supply & ServicesCanada, Ottawa, Canada: 55 pp., figs & tables, 28 × 21.5 × 0.5 cm, stiff paper cover, Can. $ 4.00, 1977.

1979 ◽  
Vol 6 (3) ◽  
pp. 249-250
Author(s):  
J. F. D. Frazer
Keyword(s):  
Present Status ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Snowshoe Hare ◽  
Hudson Bay ◽  
Western Coast ◽  
James Bay ◽  
Maritime Provinces ◽  
Paper Cover ◽  
Canadian Wildlife

scholarly journals Extralimital Sighting of a Polar Bear, Ursus maritimus, in Northeast Saskatchewan

2003 ◽  
Vol 117 (4) ◽  
pp. 648 ◽  
Author(s):  
Michael A. Goodyear
Keyword(s):  
Body Fat ◽  
Adult Male ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Hudson Bay ◽  
Western Coast ◽  
Break Up

The first documented occurrence of a Polar Bear (Ursus maritimus) in northeastern Saskatchewan, 420 km from the western coast of Hudson Bay, is described. The bear was most likely a sub-adult male in fair condition, with respect to body fat. Early break-up of ice on Hudson Bay in the spring of 1999 may have contributed to this significant extralimital sighting.

scholarly journals Excavation of an Arctic Fox, Alopex lagopus, den by a Polar Bear, Ursus maritimus

2004 ◽  
Vol 118 (4) ◽  
pp. 602
Author(s):  
Evan S. Richardson ◽  
Ryan K. Brook
Keyword(s):  
National Park ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Hudson Bay ◽  
Arctic Fox ◽  
Alopex Lagopus ◽  
N 93

We observed a Polar Bear (Ursus maritimus) excavating an Arctic Fox (Alopex lagopus) den on 24 June 1998, 3 km inland from the Hudson Bay coast (58°40'N, 93°12'W), near Cape Churchill in Wapusk National Park, Manitoba. To our knowledge this is the first observed excavation of an Arctic Fox den by a Polar Bear.

Polar bear (Ursus maritimus) maternity denning habitat in western Hudson Bay: a bottom-up approach to resource selection functions

2005 ◽  
Vol 83 (6) ◽  
pp. 860-870 ◽  
Author(s):  
Evan Richardson ◽  
Ian Stirling ◽  
David S Hik
Keyword(s):  
Resource Selection ◽  
Polar Bear ◽  
Vegetation Index ◽  
Landsat Imagery ◽  
Ursus Maritimus ◽  
Habitat Characteristics ◽  
Tree Cover ◽  
Selection Function ◽  
Hudson Bay ◽  
Western Hudson Bay

We examined habitat characteristics of 101 polar bear (Ursus maritimus Phipps, 1774) den sites and 83 adjacent unoccupied sites in western Hudson Bay, Canada, between mid-August and early October 2001 and 2002. Bears denned almost exclusively in peat banks (n = 100) along the edges of creeks, rivers, and lakes adjacent to open lichen tundra sites. Den sites differed from unoccupied sites by having greater tree cover (P = 0.002), less moss cover (P < 0.001), and less herbaceous cover (P = 0.005). The presence of tree roots improved substrate stability, providing support to den structures. Den entrance azimuths were weighted toward a southeasterly aspect (P < 0.005), away from the prevailing northwest winds. To identify habitats with the greatest relative probability of having a den, a resource selection function (RSF) model was developed using remote sensing imagery and 1245 known den locations. High normalized difference vegetation index and brightness values derived from Landsat imagery, which were in close proximity to water, corresponded well with polar bear den sites. Identification of critical denning areas through the use of RSF will provide resource managers with a valuable tool for ensuring the protection of denning habitat, and consequently female bears and their young.

Post-glacial uplift and substrate age at Cape Henrietta Maria, southeastern Hudson Bay, Canada

1970 ◽  
Vol 7 (2) ◽  
pp. 317-325 ◽  
Author(s):  
P. J. Webber ◽  
J. W. Richardson ◽  
J. T. Andrews
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
James Bay ◽  
Northern Ontario ◽  
Sea Levels ◽  
Biological Studies ◽  
History Of ◽  
Emergence Curve ◽  
Reasonable Prediction ◽  
Substrate Age

As a basis for future ecological and biogeographical studies, the post-glacial emergence history of Cape Henrietta Maria was required. This was obtained by fitting a post-glacial emergence curve to a number of radiocarbon dated marine strandlines of known elevation. Analysis shows that the elevation of lower samples is critical for a reasonable prediction of higher relative sea levels. This emergence curve suggests that during the last 1000 y uplift has been about 1.2 m per century. Extrapolation to likely dates of deglaciation (8000−7000 BP) indicates a maximum marine inundation of > 300 m. The current rate of uplift, and the hypothetical elevation of the marine limit are the highest estimations to date for eastern and arctic Canada and support the hypothesis that a center of uplift and ice-loading is situated in southeastern Hudson Bay and northern James Bay. The derived emergence curve was used to construct an isochrone map of Polar Bear Park, in eastern northern Ontario. This map provides the basis for future biological studies of community migration and succession and demonstrates that the uplift curve is a useful chronological tool.

scholarly journals Assessing polar bear ( Ursus maritimus ) population structure in the Hudson Bay region using SNP s

2016 ◽  
Vol 6 (23) ◽  
pp. 8474-8484 ◽  
Author(s):  
Michelle Viengkone ◽  
Andrew Edward Derocher ◽  
Evan Shaun Richardson ◽  
René Michael Malenfant ◽  
Joshua Moses Miller ◽  
...  
Keyword(s):  
Population Structure ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Hudson Bay

Patterns of sea ice drift and polar bear (Ursus maritimus) movement in Hudson Bay

2020 ◽  
Vol 641 ◽  
pp. 227-240
Author(s):  
NJ Klappstein ◽  
RR Togunov ◽  
JR Reimer ◽  
NJ Lunn ◽  
AE Derocher
Keyword(s):  
Energy Expenditure ◽  
Sea Ice ◽  
Body Condition ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
The Arctic ◽  
Hudson Bay ◽  
Drift Speed ◽  
Ice Drift ◽  
Sea Ice Drift

Sea ice habitats are highly dynamic, and ice drift may affect the energy expenditure of travelling animals. Several studies in the high Arctic have reported increased ice drift speeds, and consequently, polar bears Ursus maritimus in these areas expended more energy on counter-ice movement for station-keeping. However, little is known about the spatiotemporal dynamics of ice drift in Hudson Bay (HB) and its implications for the declining Western Hudson Bay (WH) polar bear subpopulation. Using sea ice drift data from 1987-2015 and polar bear satellite telemetry location data from 2004-2015, we examined trends in drift speeds in HB, polar bear movement relative to drift, and assessed annual and individual variation. In contrast to other areas of the Arctic, we did not find an increase in ice drift speed over the period examined. However, variability in ice drift speed increased over time, which suggests reduced habitat predictability. Polar bear movement direction was not strongly counter to ice drift in any month, and ice drift speed and direction had little effect on bear movement rates and, thus, energy expenditure. On an annual scale, we found individuals varied in their exposure and response to ice drift, which may contribute to variability in body condition. However, the lack of a long-term increase in ice drift speed suggests this is unlikely to be the main factor affecting the body condition decline observed in the WH subpopulation. Our results contrast findings in other subpopulations and demonstrate the need for subpopulation-specific research and risk evaluation.

Polar bear Ursus maritimus use of the western Hudson Bay flaw lead

2021 ◽  
Author(s):  
EM Henderson ◽  
AE Derocher ◽  
NJ Lunn ◽  
B Montpetit ◽  
EH Merrill ◽  
...  
Keyword(s):  
Polar Bear ◽  
Ursus Maritimus ◽  
Hudson Bay ◽  
Western Hudson Bay

scholarly journals Observations sur l’influence hydrologique de la neige dans l’Est du Canada

2005 ◽  
Vol 2 (3) ◽  
pp. 75-86
Author(s):  
Christian Mingasson
Keyword(s):  
General Rule ◽  
Hudson Bay ◽  
James Bay ◽  
Maritime Provinces ◽  
Northern Ontario ◽  
Run Off ◽  
Northern Regions ◽  
Total Discharge ◽  
Flooding Period

This article deals with a group of 27 rivers all situated East of the 85 th meridian and South of Hudson Bay. In the first place, the author bas calculated the ratios of snow run-off during the springtime discharge. In the Maritime Provinces, the ratio obtained is only 20% of the total discharge (with a minimum of 17%) because of the rainy marine characteristics of the climate. In the Laurentian region, the ratio is close to 30% (maximum 35%) because of abundant snow precipitations and quite low summer discharge. One must note the retentional influence of lakes which display the flooding period jar beyond springtime and lower the spring ratio down to 23%. For instance, in Northern Ontario, due to losses in the marshy zones, the author bas found a ratio of only 19%. A second problem raised in this paper is the dating of the beginning of floods caused by the melting of snow. In the Southern parts of the Maritime provinces and of Ontario, the waters are high on April 5 th. In the Southern and Central parts of Québec, the flooding period begins between the 6 th and the 20 th of April. In the regions situated North of the St. Lawrence and South of James Bay, the flooding period usually begins after the 25 th of April. So the flooding period caused by the melting of snow happens later in the Northern regions. Finally, the author considers the monthly ratios of discharge during the month that knows the highest waters. Those ratios are between 2 and 3 (maximum 4.64) but they can lower down to 1.50 due to retention operated by the lakes. The month of maximum flooding extends from March, in the Southern parts of the zone covered by this study, to June, in the Northern parts. As a general rule, the figures found in this article are lower than those recorded for the rivers of the U.S.S.R.

Distribution and abundance of ringed (Phoca hispida) and bearded seals (Erignathus barbatus) in western Hudson Bay

1997 ◽  
Vol 54 (4) ◽  
pp. 914-921 ◽  
Author(s):  
N J Lunn ◽  
I Stirling ◽  
S N Nowicki
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
Phoca Hispida ◽  
Current Estimate ◽  
Ringed Seals ◽  
Erignathus Barbatus ◽  
The Mean ◽  
Western Hudson Bay ◽  
The Relationship ◽  
Bearded Seals

We flew a medium-altitude, systematic, strip-transect survey for ringed (Phoca hispida) and bearded seals (Erignathus barbatus) over western Hudson Bay in early June 1994 and 1995. The mean density (per square kilometre) of ringed seals hauled out on the ice was four times higher in 1995 (1.690) than in 1994 (0.380). The 1994 survey appeared to underestimate seal abundance because it was flown too late. Ringed seals preferred high ice cover habitat (6 + /8 ice) and, within this habitat, favoured cracking ice and large floes. We found no consistent effect of either wind or cloud cover on habitat preference. We estimated a total of 1980 bearded seals and 140<|>880 ringed seals hauled out on the sea ice in June 1995. A recent review of the relationship between ringed seal and polar bear (Ursus maritimus) populations suggests that a visible population of this size should support a population of up to 1300 polar bears, which is in general agreement with the current estimate of 1250-1300 bears in western Hudson Bay.

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