Polar bear research paper
In the north atlantic, harp seals and hooded seals (crystophora cristata), both ice-breeding species, already migrate to the ice edge in summer and currently form a part of the polar bear's diet. Adult males have a higher annual mortality rate than alaska, polar bear densities have been estimated to be between 1 bear/38 sq km (1 bear/15 sq mi) and 1 bear/139 sq km (1 bear/54 sq mi).
Polar bears life span it is believed that polar bears live an average of 15 to 18 years, though some bears have tagged in their early 30s. It is possible that these species could expand northward and come into greater contact with polar bears particularly if whelping areas are relocated to higher latitudes.
Plus, we guarantee free unlimited will enjoy direct contact with the writer throughout the entire process and will receive the paper by e-mail/ content will be 100% original and there will be no plagiarism. Polar bears “saving the white beast” the polar bear males can measure up to nine feet long, and can weigh 770-1430 lbs.
The fur of the polar bear covers their entire body except their nose and pads of their feet. Bearded seals, walrus, and occasionally harbour seals (phoca vitulina) are captured by polar bears when hauled out on land but such opportunities tend to be quite local and learned by a limited number of individuals.
Bear eats the oil while grooming it could made pollution is also a cause of death. Some are stable, some seem to be increasing, and some are decreasing due to various of the polar bear populations in 2014.
In general, population losses can be precursors of extinction and habitat loss is a primary cause of species extinction (beissinger, 2000; ceballos and ehrlich, 2002); as polar bear habitat is altered or reduced, the conservation concerns will increase. Regardless of variations in individual models or papers that deal with different parts of the arctic, the overwhelming consensus appears to be that the climate is warming, total ice cover is decreasing at a significant rate, and that large parts of the polar basin may be largely or completely ice-free in as little as 100 years.
In addition, polar bear cub mortality was thought to be high in some areas of svalbard owing to extensive areas of open water (larsen, 1985) in part due to the rapid chilling of cubs exposed to cold water (blix and lentfer, 1979). The social and economic implications to local communities of losing this harvest are beyond the scope of this paper but could have serious local economic tly, most hunted polar bear populations are inventoried using mark and recapture methods to determine sustainable harvests (e.
At an average the polar bears have about five million square miles of living space. Female bears generally stand eight feet tall and weigh 400 to 600 pounds, except some, which can reach 700 pounds.
They are also found in greenland, on islands off the shore of norway, on the northern coast of the former soviet union, and on the northern and northwestern coasts of alaska in the united polar bear is one the largest members of the bear family. Diet of female polar bears in the southern beaufort sea of alaska: evidence for an emerging alternative foraging strategy in response to environmental change.
Space use by polar bears in and around auyuittuq national park, northwest territories, during the ice-free period. When the nations found out their dilemma they wanted to find more information on the polar bear.
Recent observations of intraspecific predation and cannibalism among polar bears in the southern beaufort sea. During periods of climatic cooling, polar bears ranged much further south than they do at present (kurtén, 1964; aaris-sørensen and petersen, 1984) but their fossil record is scant and there is little information on how they may have responded or adapted during earlier climatic fluctuations.
Changing arctic ecosystems: updated forecast: reducing carbon dioxide (co2) emissions required to improve polar bear outlook. Thus, anything that significantly changes the distribution, abundance, or even the existence of sea ice will have profound effects on polar is important also to consider that there are different types of sea ice and that its distribution over water of varying depths and locations has significant effects on the ecology of polar bears.
Smallest foot pad is the front trackand the larger is bears have wide front paws with slightly webbed toes that swim. Implications of the circumpolar genetic structure of polar bears for their conservation in a rapidly warming arctic.
According to polar bears international (2014) other terms are beliy medved meaning white bear in russian, isbjorn, meaning ice bear in norweigan.... Geographical distribution of organochlorine pesticides (ocps) in polar bears (ursus maritimus) in the norwegian and russian arctic.
Polar bears are sensitive to oil from spills (stirling, 1990) and it is likely this source of impact will increase mortality rates of polar bears and their prey. A result, the average weight of female polar bears has dropped by about 21% between 1980 and 2004, and the population declined by 22% between 1987 and 2004.
