Observations of a wild polar bear (Ursus maritimus) successfully fishing Arctic charr (Salvelinus alpinus) and Fourhorn sculpin (Myoxocephalus quadricornis)

  title={Observations of a wild polar bear (Ursus maritimus) successfully fishing Arctic charr (Salvelinus alpinus) and Fourhorn sculpin (Myoxocephalus quadricornis)},
  author={Markus G. Dyck and Stefan Romberg},
  journal={Polar Biology},
Polar bears, Ursus maritimus, throughout their range, are nutritionally dependent on ringed (Phoca hispida) and bearded seals (Erignathus barbatus), which are predominantly caught on the sea ice. [] Key Method Here, we document observations of a young male polar bear catching Arctic charr (Salvelinus alpinus) and Fourhorn sculpin (Myoxocephalusquadricornis) by diving in Creswell Bay, Nunavut. We recorded six search bouts, where six fish were caught during dives, which were preceded by a snorkel. The average…
The diet of polar bears (Ursus maritimus) from Svalbard, Norway, inferred from scat analysis
The novel combination of genetic analyses of material in the fecal samples along with detailed exploration of the physical–structural properties of prey hairs and plant parts provided a much fuller picture of the diet of polar bears than would have been possible from observational studies of polar bear predation behavior alone.
Aquatic behaviour of polar bears (Ursus maritimus) in an increasingly ice-free Arctic
The considerable swimming and diving capacities of polar bears might provide them with tools to exploit aquatic environments previously not utilized, likely to be increasingly important to the species’ survival in an Arctic with little or no persistent sea ice.
Polar bears are inefficient predators of seabird eggs
The foraging behaviours exhibited by polar bears in this study suggest they are inefficient predators of seabird eggs, particularly in the context of matching behaviours to resource density.
Longest recorded underwater dive by a polar bear
It is possible that the ability to hold its breath for so long may indicate the initial development of a significant adaptation for living and hunting in its marine environment, as increased diving ability cannot evolve rapidly enough to compensate for the increasing difficulty of hunting seals during the rapidly declining availability of sea ice during the open-water period resulting from climate warming.
Wabusk of the Omushkegouk: Cree-Polar Bear (Ursus maritimus) Interactions in Northern Ontario
In order to understand wabusk (polar bear, Ursus maritimus) behaviours and interactions with people in the Hudson Bay lowlands of northern Ontario we conducted this collaborative study of Cree
Estimating the Energetic Contribution of Polar Bear (Ursus maritimus) Summer Diets to the Total Energy Budget
Abstract Polar bears (Ursus maritimus) are faced with potential drastic changes to their ice habitat in the near future. Climate models predict that the ice-covered period during which bears use the
Longer ice-free seasons increase the risk of nest depredation by polar bears for colonial breeding birds in the Canadian Arctic
Examination of polar bears’ use of an ancillary prey resource, eggs of colonial nesting birds, in relation to diminishing sea ice coverage in a low latitude region of the Canadian Arctic shows how changes in abiotic conditions caused by climate change have altered predator–prey dynamics and are leading to cascading ecological impacts in Arctic ecosystems.
Observations of intraspecific killing, cannibalism, and aggressive behavior among polar bears (Ursus maritimus) in the eastern Barents Sea and the Kara Sea
Surprisingly, cases of intraspecific killing were observed even in years when sea-ice conditions in the previous spring were relatively good, and in one case, the killing of a cub of the year in the spring by a large, fat male could hardly be explained by nutritional demands.
How Important Is Land-Based Foraging To Polar Bears (ursus Maritimus) During The Ice-Free Season In Western Hudson Bay? An Examination Of Dietary Shifts, Compositional Patterns, Behavioral Observations And Energetic Contributions
Can polar bears use terrestrial foods to offset lost ice‐based hunting opportunities?
Increased land use by polar bears (Ursus maritimus) due to climate-change-induced reduction of their sea-ice habitat illustrates the impact of climate change on species distributions and the


Midsummer observations on the behavior of wild polar bears (Ursus maritimus)
A diurnal rhythm was recorded in which bears slept most during the latter third of the 24-h cycle and least in the first third, and all cubs observed hunted, but they exhibited great variety in patience and apparent skill.
Aspects of Predation of Seals by Polar Bears
Ringed seals and bearded seals killed by polar bears in the western arctic and the eastern high arctic were collected to study interspecific relationships and scavenging of unutilized seal remains.
Diet composition of polar bears in Svalbard and the western Barents Sea
It is believed that different patterns of space use by different bears may result in geographic variation of diet within the same population, and bearded seals are an important dietary item for polar bears in the western Barents Sea.
Polar bear predation of ringed and bearded seals in the land-fast sea ice habitat
Predation of seals by the polar bear, Ursus maritimus, was not significant in the Western Arctic. In the High Central and Eastern Arctic, and along southeastern Baffin Island, bear predation of the
Polar Bear Predatory Behaviour toward Molting Barnacle Geese and Nesting Glaucous Gulls on Spitsbergen
These observations are the first documented instances of a polar bear hunting for barnacle goose and glaucous gull and provide additional evidence of the use of terrestrial prey by polar bears during the season of minimal ice extent.
Nocturnal and diurnal foraging behaviour of brown bears (Ursus arctos) on a salmon stream in coastal British Columbia
The results indicate that brown bears are highly successful during nocturnal foraging and exploit this period during spawning migration to maximize their consumption rates of an ephemeral resource.
Cannibalism of a Yearling Polar Bear ( Ursus maritimus ) at Churchill, Canada
Circumstantial evidence suggests that the adult male killed the yearling, although it is possible that he took the kill from another bear.
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 and the energetic importance of terrestrial foraging was not able to be determined, but the intake may reduce the rate of weight loss of bear on land, particularly in years when berries are abundant.
The significance of supplemental food to polar bears during the ice-free period of Hudson Bay
The data indicated that individual needs and learning were major factors determining which bears used the Churchill dump, and bears which fed in the dump were significantly heavier than those which did not.
The Food Habits of Polar Bears of James Bay and Southwest Hudson Bay in Summer and Autumn
A study of summer and autumn food habits of polar bears ( Ursus maritimus Phipps) on some islands of James Bay and the coastal mainland of southwest Hudson Bay was conducted in 1968 and 1969.