Long-term Trends in the Population Ecology of Polar Bears in Western Hudson Bay in Relation to Climatic Change

ARCTIC ◽  
1999 ◽  
Vol 52 (3) ◽  
Author(s):  
Ian Stirling ◽  
Nicholas J. Lunn ◽  
John Iacozza
Keyword(s):  
Climatic Change ◽  
Population Ecology ◽  
Hudson Bay ◽  
Polar Bears ◽  
Long Term Trends ◽  
Western Hudson Bay

Temporal variation in reproduction and body mass of polar bears in western Hudson Bay

1995 ◽  
Vol 73 (9) ◽  
pp. 1657-1665 ◽  
Author(s):  
Andrew E. Derocher ◽  
Ian Stirling
Keyword(s):  
Body Mass ◽  
Litter Production ◽  
Hudson Bay ◽  
Polar Bears ◽  
Age Classes ◽  
Study Recruitment ◽  
Term Variation ◽  
Long Term Trends ◽  
Western Hudson Bay

We studied annual and long-term variation in rates of reproduction in female polar bears (Ursus maritimus) in western Hudson Bay from 1966 to 1992. In addition, long-term trends in body mass were examined from 3146 captured polar bears. Reproduction rates declined in the late 1980s from higher levels in 1966–1984. Litter production decreased from 0.48 to 0.34 litters per female each year over the study. Recruitment to autumn declined from 0.75 to 0.52 cubs per female each year, in part because of cub mortality between spring and autumn, which increased from 25.0% in 1980–1984 to 50.9% in 1987–1992. Spring and autumn litter sizes of females with cubs did not vary annually, but litter sizes of females with yearlings varied between years. The proportion of yearlings independent of their mother in autumn dropped from 81% prior to 1980 to 34% in 1980–1992. After 1986, offspring remained with their mothers longer, resulting in the birth interval increasing from 2.1 to 2.9 years. Body mass of most age-classes of females and males declined in the 1980s. Unlike earlier studies that found reproduction rates to be higher in western Hudson Bay than in higher latitude populations, reproduction rates in 1986–1992 in western Hudson Bay were similar to those of other populations. Insufficient information was available to determine the cause of declines in reproduction and body mass.

The role of diet on long-term concentration and pattern trends of brominated and chlorinated contaminants in western Hudson Bay polar bears, 1991–2007

2010 ◽  
Vol 408 (24) ◽  
pp. 6210-6222 ◽  
Author(s):  
Melissa A. McKinney ◽  
Ian Stirling ◽  
Nick J. Lunn ◽  
Elizabeth Peacock ◽  
Robert J. Letcher
Keyword(s):  
Hudson Bay ◽  
Polar Bears ◽  
Chlorinated Contaminants ◽  
Western Hudson Bay

Heritability of body size in the polar bears of Western Hudson Bay

2018 ◽  
Vol 18 (4) ◽  
pp. 854-866 ◽  
Author(s):  
René M. Malenfant ◽  
Corey S. Davis ◽  
Evan S. Richardson ◽  
Nicholas J. Lunn ◽  
David W. Coltman
Keyword(s):  
Body Size ◽  
Hudson Bay ◽  
Polar Bears ◽  
Western Hudson Bay

Future sea ice conditions in Western Hudson Bay and consequences for polar bears in the 21st century

2013 ◽  
Vol 19 (9) ◽  
pp. 2675-2687 ◽  
Author(s):  
Laura Castro de la Guardia ◽  
Andrew E. Derocher ◽  
Paul G. Myers ◽  
Arjen D. Terwisscha van Scheltinga ◽  
Nick J. Lunn
Keyword(s):  
Sea Ice ◽  
21St Century ◽  
Hudson Bay ◽  
Polar Bears ◽  
Ice Conditions ◽  
Western Hudson Bay

Seasonal habitat selection by adult female polar bears in western Hudson Bay

2016 ◽  
Vol 58 (3) ◽  
pp. 407-419 ◽  
Author(s):  
Alysa G. McCall ◽  
Nicholas W. Pilfold ◽  
Andrew E. Derocher ◽  
Nicholas J. Lunn
Keyword(s):  
Habitat Selection ◽  
Adult Female ◽  
Hudson Bay ◽  
Polar Bears ◽  
Western Hudson Bay

Reply to response to Dyck et al. (2007) on polar bears and climate change in western Hudson Bay by Stirling et al. (2008)

2008 ◽  
Vol 5 (4) ◽  
pp. 289-302 ◽  
Author(s):  
M.G. Dyck ◽  
W. Soon ◽  
R.K. Baydack ◽  
D.R. Legates ◽  
S. Baliunas ◽  
...  
Keyword(s):  
Climate Change ◽  
Hudson Bay ◽  
Polar Bears ◽  
Western Hudson Bay

Selection of maternity dens by female polar bears in western Hudson Bay, Canada and the effects of human disturbance

Polar Biology ◽  
2004 ◽  
Vol 27 (6) ◽  
pp. 350-356 ◽  
Author(s):  
Nick J. Lunn ◽  
Ian Stirling ◽  
Dennis Andriashek ◽  
Evan Richardson
Keyword(s):  
Human Disturbance ◽  
Hudson Bay ◽  
Polar Bears ◽  
Western Hudson Bay ◽  
Selection Of
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