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- 4Derocher, A.E.
- 3Andrew E. Derocher
- 3Mark A. Lewis
- 2Derocher, A. E.
- 2Derocher, Andrew E.
- 2Stirling, I.
- 11Biological Sciences, Department of
- 11Biological Sciences, Department of/Journal Articles (Biological Sciences)
- 9Graduate Studies and Research, Faculty of
- 9Graduate Studies and Research, Faculty of/Theses and Dissertations
- 4Mathematical and Statistical Sciences, Department of
- 4Mathematical and Statistical Sciences, Department of/Research Publications (Mathematical and Statistical Sciences)
A body composition model to estimate mammalian energy stores and metabolic rates from body mass and body length, with application to polar bearsDownload
Many species experience large fluctuations in food availability and depend on energy from fat and protein stores for survival, reproduction and growth. Body condition and, more specifically, energy stores thus constitute key variables in the life history of many species. Several indices exist to...
We observed a case of adoption of a single four-month-old polar bear cub (Ursus maritimus) into an existing litter of two cubs on Hopen Island, Svalbard. We believe the high density of maternity dens in the study area may increase the likelihood of natural adoption. Speculation about theoretical...
A case of polar bear infanticide and cannibalism is reported from Phippsøya, Svalbard. In this instance, a cub of some 7 months was killed by an adult male bear, which was in poor condition, in the close proximity of the mother,which was also in poor condition. It seems probable that the attack...
The development of novel biomarkers to help assess whether polar bear (Ursus maritimus) health is impacted by long-term physiological stress associated with climate change represents an emerging area of research. With progressively greater reductions in sea ice cover and a corresponding decrease...
Climate change is altering sea ice phenology, which forces polar bears (Ursus maritimus) to spend an increasing amount of time on land. Therefore, understanding movement ecology and terrestrial habitat selection of bears may become increasingly important for conservation planning. The Western...
Home range size estimates are often used to assess the amount of space required for animals to perform the activities essential for their survival and reproduction. However, in moving environments, traditional home range estimates may be ill suited to this task. In particular, traditional home...
Two instances of infanticide and cannibalism in polar bears (Ursus maritimus) were observed in SE Svalbard, at Hopen Island. In the first, an adult male killed three young cubs at a den site and consumed one of them. In the second, an adult male actively pursued, killed, and consumed a dependent...
Polar bears (Ursus maritimus, Nanuut) are a culturally and economically important species to the Inuvialuit. As a result of climate change, the Arctic is experiencing rapid ecological changes with the potential for profound impacts on polar bear populations. The objectives of the thesis were to...
Animals must balance a series of costs and benefits while trying to maximize their fitness. For example, an individual may need to choose how much energy to allocate to reproduction versus growth, or how much time to spend on vigilance versus foraging. Their decisions depend on complex...