Andrew E Derocher
Biographic Data
| ID | 1347903 |
|---|---|
| NAME | Andrew E Derocher |
| GIVEN NAMES | Andrew E |
| FAMILY NAME | Derocher |
| SIGNATURE | DEROCHER A E |
| AFFILIATIONS | University of Alberta |
| ORCID | 0000-0002-1104-7774 |
| VERIFIED | Yes |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 5 |
| WORKS AS AUTHOR | 13 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1991 |
| LATEST PUBLICATION YEAR | 2017 |
| H-INDEX | 1 |
Polar bear ( Ursus maritimus ) Migration from Maternal Dens in Western Hudson Bay
Migration is a common life history strategy among Arctic vertebrates, yet some of its aspects remain poorly described for some species. In February-March, post-parturient polar bears (Ursus maritimus) in western Hudson Bay, Canada, migrate from maternity den sites on land to the sea ice with three- to four-month-old cubs. We investigated this migration using data from 10 adult females fitted with satellite-linked global positioning system collars…
Long-Distance Movement of a Female Polar Bear from Canada to Russia
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 …
Conservation and management of large carnivores in North America
Between the eighteenth and twentieth centuries in North America, large carnivores were significantly reduced in numbers and distribution. Wildlife management priorities changed during the last century to emphasize recovery and conservation with benefits to all species. Populations of large carnivores are likely to persist and expand into new areas within their original range where habitats are both socially and biologically suitable. Polar bears …
Changes in Land Distribution of Polar Bears in Western Hudson Bay
We examined the capture locations of polar bears (Ursus maritimus) on land in western Hudson Bay over 19 years (1986–2004) to assess temporal trends in the distribution of the population. We found that the distribution of bears of most age and sex groups shifted northward and eastward over the study. The causes of these shifts may be related to an altered population structure, changing environmental conditions, or a combination of both factors. S…
The World of the Polar Bear, by Norbert Rosing
Unusual Predation Attempts of Polar Bears on Ringed Seals in the Southern Beaufort Sea
In April and May 2003 through 2006, unusually rough and rafted sea ice extended for several tens of kilometres offshore in the southeastern Beaufort Sea from about Atkinson Point to the Alaska border. Hunting success of polar bears (Ursus maritimus) seeking seals was low despite extensive searching for prey. It is unknown whether seals were less abundant in comparison to other years or less accessible because they maintained breathing holes below…
Brown Bear ( Ursus arctos ) Predation of Broad Whitefish ( Coregonus nasus ) in the Mackenzie Delta Region, Northwest Territories
On 2 October 2007, we observed evidence of at least one brown bear (Ursus arctos) predating and caching broad whitefish (Coregonus nasus) at Pete’s Creek, a tributary of the Mackenzie River, Northwest Territories. While predation on whitefish by brown bears has been reported as traditional ecological knowledge in the Northwest Territories, accounts in the scientific literature of brown bears feeding on fish other than salmon, trout (Oncorhynchus …
An incident of polar bear infanticide and cannibalism on Phippsøya, Svalbard
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 was made for nutritional gain
Infanticide and Cannibalism of Juvenile Polar Bears ( Ursus maritimus ) in Svalbard
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 yearling. Infanticide of dependent polar bear offspring by adult males may be more common in Svalbard than in other populations because the population is…
Observation of Adoption in Polar Bears ( Ursus maritimus )
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 implications of adoption is of scientific interest. However, we believe that the probability of adoption may increase when family groups are captured, an…
Terrestrial Foraging by Polar Bears during the Ice-Free Period in Western Hudson Bay
Food habits of polar bears on land during the ice-free period in western Hudson Bay were examined between 1986 and 1992. In contrast to previous studies, feeding on vegetation during the ice-free period was common. Between August and October, evidence of feeding was found in 34% of the females and 26% of the males captured over 10 km inland from the coast. The primary forage was Vaccinium uliginosum and Empetrum nigrum berries. Feeding was most c…
Possible Impacts of Climatic Warming on Polar Bears
If climatic warming occurs, the first impacts on polar bears (Ursus maritimus) will be felt at the southern limits of their distribution, such as in James and Hudson bays, where the whole population is already forced to fast for approximately four months when the sea ice melts during the summer. Prolonging the ice-free period will increase nutritional stress on this population until they are no longer able to store enough fat to survive the ice-f…
Oil contamination of polar bears
An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content
Conservation and management of large carnivores in North America
Between the eighteenth and twentieth centuries in North America, large carnivores were significantly reduced in numbers and distribution. Wildlife management priorities changed during the last century to emphasize recovery and conservation with benefits to all species. Populations of large carnivores are likely to persist and expand into new areas within their original range where habitats are both socially and biologically suitable. Polar bears …
An incident of polar bear infanticide and cannibalism on Phippsøya, Svalbard
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 was made for nutritional gain
Oil contamination of polar bears
An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content
Terrestrial Foraging by Polar Bears during the Ice-Free Period in Western Hudson Bay
Food habits of polar bears on land during the ice-free period in western Hudson Bay were examined between 1986 and 1992. In contrast to previous studies, feeding on vegetation during the ice-free period was common. Between August and October, evidence of feeding was found in 34% of the females and 26% of the males captured over 10 km inland from the coast. The primary forage was Vaccinium uliginosum and Empetrum nigrum berries. Feeding was most c…
Possible Impacts of Climatic Warming on Polar Bears
If climatic warming occurs, the first impacts on polar bears (Ursus maritimus) will be felt at the southern limits of their distribution, such as in James and Hudson bays, where the whole population is already forced to fast for approximately four months when the sea ice melts during the summer. Prolonging the ice-free period will increase nutritional stress on this population until they are no longer able to store enough fat to survive the ice-f…
Infanticide and Cannibalism of Juvenile Polar Bears ( Ursus maritimus ) in Svalbard
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 yearling. Infanticide of dependent polar bear offspring by adult males may be more common in Svalbard than in other populations because the population is…
Observation of Adoption in Polar Bears ( Ursus maritimus )
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 implications of adoption is of scientific interest. However, we believe that the probability of adoption may increase when family groups are captured, an…
An incident of polar bear infanticide and cannibalism on Phippsøya, Svalbard
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 was made for nutritional gain
The World of the Polar Bear, by Norbert Rosing
Unusual Predation Attempts of Polar Bears on Ringed Seals in the Southern Beaufort Sea
In April and May 2003 through 2006, unusually rough and rafted sea ice extended for several tens of kilometres offshore in the southeastern Beaufort Sea from about Atkinson Point to the Alaska border. Hunting success of polar bears (Ursus maritimus) seeking seals was low despite extensive searching for prey. It is unknown whether seals were less abundant in comparison to other years or less accessible because they maintained breathing holes below…
Brown Bear ( Ursus arctos ) Predation of Broad Whitefish ( Coregonus nasus ) in the Mackenzie Delta Region, Northwest Territories
On 2 October 2007, we observed evidence of at least one brown bear (Ursus arctos) predating and caching broad whitefish (Coregonus nasus) at Pete’s Creek, a tributary of the Mackenzie River, Northwest Territories. While predation on whitefish by brown bears has been reported as traditional ecological knowledge in the Northwest Territories, accounts in the scientific literature of brown bears feeding on fish other than salmon, trout (Oncorhynchus …
Changes in Land Distribution of Polar Bears in Western Hudson Bay
We examined the capture locations of polar bears (Ursus maritimus) on land in western Hudson Bay over 19 years (1986–2004) to assess temporal trends in the distribution of the population. We found that the distribution of bears of most age and sex groups shifted northward and eastward over the study. The causes of these shifts may be related to an altered population structure, changing environmental conditions, or a combination of both factors. S…
Conservation and management of large carnivores in North America
Between the eighteenth and twentieth centuries in North America, large carnivores were significantly reduced in numbers and distribution. Wildlife management priorities changed during the last century to emphasize recovery and conservation with benefits to all species. Populations of large carnivores are likely to persist and expand into new areas within their original range where habitats are both socially and biologically suitable. Polar bears …
Polar bear ( Ursus maritimus ) Migration from Maternal Dens in Western Hudson Bay
Migration is a common life history strategy among Arctic vertebrates, yet some of its aspects remain poorly described for some species. In February-March, post-parturient polar bears (Ursus maritimus) in western Hudson Bay, Canada, migrate from maternity den sites on land to the sea ice with three- to four-month-old cubs. We investigated this migration using data from 10 adult females fitted with satellite-linked global positioning system collars…
Long-Distance Movement of a Female Polar Bear from Canada to Russia
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 …
Biology (11 works) · Geography (11 works) · Marine animal studies overview (11 works) · Ecology (10 works) · Ecology (10 works) · Ursus maritimus (8 works) · Arctic and Antarctic ice dynamics (7 works) · Arctic (6 works) · Sea ice (6 works) · Geology (5 works)