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Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change
It is demonstrated that brown bears and PBs have had sufficiently independent evolutionary histories over the last 4–5 million years to leave imprints in the PB nuclear genome that likely are associated with ecological adaptation to the Arctic environment. Expand
Genetic structure of the world’s polar bear populations
It is suggested that the observed pattern of genetic discontinuities has developed in response to differences in the seasonal distribution and pattern of sea ice habitat and the effects of these differences on the distribution and abundance of seals. Expand
Organochlorines in polar bears (Ursus maritimus) at Svalbard.
No relation between OC levels in females and their ability to get pregnant is found in this preliminary investigation on OC effects on the polar bears at Svalbard. Expand
Relationships between PCBs and thyroid hormones and retinol in female and male polar bears.
Female polar bears could be more susceptible to TH-related effects of PCBs than are males, and PCBs also affected T3 to a larger degree than T4. Expand
Relationships Between Plasma Levels of Organochlorines, Retinol and Thyroid Hormones from Polar Bears (Ursus maritimus) at Svalbard
Associations were determined between retinol and the thyroid hormones thyroxine (T4) and triiodothyronine (T3), respectively, and the organochlorine contaminants (OCs) polychlorinated biphenylsExpand
Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear
It is shown that the phylogenetic position of the ancient polar bear lies almost directly at the branching point between polar bears and brown bears, elucidating a unique morphologically and molecularly documented fossil link between living mammal species. Expand
Chlorinated Hydrocarbon Contaminants in Polar Bears from Eastern Russia, North America, Greenland, and Svalbard: Biomonitoring of Arctic Pollution
Abstract. Adipose tissue samples from polar bears (Ursus maritimus) were obtained by necropsy or biopsy between the spring of 1989 to the spring of 1993 from Wrangel Island in Russia, most of theExpand
Arctic marine mammal population status, sea ice habitat loss, and conservation recommendations for the 21st century
Recommendations for effective AMM conservation are maintained and improved by local, federal, and international partners; recognize spatial and temporal variability in AMM subpopulation response to climate change; implement monitoring programs with clear goals; mitigate cumulative impacts of increased human activity; and recognize the limits of current protected species legislation. Expand
Predicting 21st‐century polar bear habitat distribution from global climate models
Projections of polar bear (Ursus maritimus) sea ice habitat distribution in the polar basin during the 21st century were developed to understand the consequences of anticipated sea ice reductions onExpand
Does High Organochlorine (OC) Exposure Impair The Resistance To Infection In Polar Bears (Ursus Maritimus)? Part I: Effect Of Ocs On The Humoral Immunity
It is demonstrated that high OC levels may impair the polar bears ability to produce antibodies and thus may produce impaired resistance to infections. Expand