Den Collapse Kills Female Polar Bear and Two Newborn Cubs

ARCTIC ◽  
1991 ◽  
Vol 44 (1) ◽  
Author(s):  
Peter L. Clarkson ◽  
Doug Irish
Keyword(s):  
Polar Bear ◽  
Female Polar Bear

scholarly journals Increased Arctic sea ice drift alters adult female polar bear movements and energetics

2017 ◽  
Vol 23 (9) ◽  
pp. 3460-3473 ◽  
Author(s):  
George M. Durner ◽  
David C. Douglas ◽  
Shannon E. Albeke ◽  
John P. Whiteman ◽  
Steven C. Amstrup ◽  
...  
Keyword(s):  
Sea Ice ◽  
Adult Female ◽  
Polar Bear ◽  
Arctic Sea Ice ◽  
Ice Drift ◽  
Arctic Sea ◽  
Sea Ice Drift ◽  
Female Polar Bear

Consequences of long-distance swimming and travel over deep-water pack ice for a female polar bear during a year of extreme sea ice retreat

Polar Biology ◽  
2011 ◽  
Vol 34 (7) ◽  
pp. 975-984 ◽  
Author(s):  
George M. Durner ◽  
John P. Whiteman ◽  
Henry J. Harlow ◽  
Steven C. Amstrup ◽  
Eric V. Regehr ◽  
...  
Keyword(s):  
Sea Ice ◽  
Deep Water ◽  
Polar Bear ◽  
Long Distance ◽  
Pack Ice ◽  
Ice Retreat ◽  
Female Polar Bear ◽  
Sea Ice Retreat

scholarly journals Long-Distance Movement of a Female Polar Bear from Canada to Russia

ARCTIC ◽  
2017 ◽  
Vol 70 (2) ◽  
pp. 121 ◽  
Author(s):  
Amy C. Johnson ◽  
Jodie D. Pongracz ◽  
Andrew E. Derocher
Keyword(s):  
Home Range ◽  
Sea Ice ◽  
Polar Bear ◽  
Brownian Bridge ◽  
Polar Bears ◽  
Minimum Convex Polygon ◽  
Long Distance ◽  
Movement Model ◽  
Female Polar Bear ◽  
Long Distance Movement

Polar bears (Ursus maritimus) display fidelity to large geographic regions, and their movements are influenced by sea ice distribution. Polar bear subpopulations are moderately distinct from one another, and long-distance movements between subpopulations are rare. We describe and analyze the movements of a female polar bear tracked by satellite telemetry from spring 2009 for 798 days. This female traveled an exceptionally long distance (totaling 11 686 km) from the sea ice off the Yukon Territory, Canada (Southern Beaufort Sea subpopulation) to Wrangel Island, Russia (Chukchi Sea subpopulation). In comparison to other polar bears in this study, this bear traveled farther, moved faster, and had a much larger home range in the first year. Furthermore, the calculation of the home range size by two different methods demonstrated that the commonly used minimum convex polygon method overestimated the home range compared to the less biased Brownian bridge movement model. This female’s long-distance movement was unusual and provides additional evidence for gene flow between subpopulations. Monitoring polar bear movements is useful to track such events, which is especially important at present because sea ice loss due to climate change can affect subpopulation boundaries and influence management.

Movement of a female polar bear (Ursus maritimus) in the Kara Sea during the summer sea-ice break-up

2017 ◽  
Vol 472 (1) ◽  
pp. 17-20 ◽  
Author(s):  
V. V. Rozhnov ◽  
N. G. Platonov ◽  
S. V. Naidenko ◽  
I. N. Mordvintsev ◽  
E. A. Ivanov
Keyword(s):  
Sea Ice ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Kara Sea ◽  
Female Polar Bear ◽  
Break Up

Shifts in female polar bear (Ursus maritimus) habitat use in East Greenland

Polar Biology ◽  
2015 ◽  
Vol 38 (6) ◽  
pp. 879-893 ◽  
Author(s):  
Kristin L. Laidre ◽  
Erik W. Born ◽  
Patrick Heagerty ◽  
Øystein Wiig ◽  
Harry Stern ◽  
...  
Keyword(s):  
Habitat Use ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
East Greenland ◽  
Female Polar Bear

scholarly journals Acute Chagas' cardiopathy in a polar bear (Ursus maritimus) in Guadalajara, Mexico

1997 ◽  
Vol 30 (4) ◽  
pp. 337-340 ◽  
Author(s):  
J. Jaime-Andrade G. ◽  
David Avila-Figueroa ◽  
Felipe J. Lozano-Kasten ◽  
René J. Hernández-Gutiérrez ◽  
Ezequiel Magallón-Gastélum ◽  
...  
Keyword(s):  
Trypanosoma Cruzi ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Histopathological Findings ◽  
Female Polar Bear ◽  
The City

We report a 24 year old female polar bear (Ursus maritimus) who contracted Chagas' infection at the Guadalajara Zoo, in Jalisco, México, and died of acute Chagas' carditis 15 days later. The histopathological findings are described, as well as the presence of triatomines (Triatoma longipennis Usinger) infected with Trypanosoma cruzi collected within 5 meters from the place where the animal lived in the city of Guadalajara.

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.

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