Results 11 to 20 of about 176,284 (192)

Polar bear attacks on humans: Implications of a changing climate

Wildlife Society Bulletin, 2017
Understanding causes of polar bear (Ursus maritimus) attacks on humans is critical to ensuring both human safety and polar bear conservation. Although considerable attention has been focused on understanding black (U. americanus) and grizzly (U.
James M. Wilder, Dag Vongraven, Todd Atwood, Bob Hansen, Amalie Jessen, Anatoly Kochnev, Geoff York, Rachel Vallender, Daryll Hedman, Melissa Gibbons   +9 more
doaj   +2 more sources

Projected polar bear sea ice habitat in the Canadian Arctic Archipelago. [PDF]

PLoS ONE, 2014
Sea ice across the Arctic is declining and altering physical characteristics of marine ecosystems. Polar bears (Ursus maritimus) have been identified as vulnerable to changes in sea ice conditions.
Stephen G Hamilton, Laura Castro de la Guardia, Andrew E Derocher, Vicki Sahanatien, Bruno Tremblay, David Huard   +5 more
doaj   +2 more sources

Insights into bear evolution from a Pleistocene polar bear genome. [PDF]

Proc Natl Acad Sci U S A, 2022
Lan T, Leppälä K, Tomlin C, Talbot SL, Sage GK, Farley SD, Shideler RT, Bachmann L, Wiig Ø, Albert VA, Salojärvi J, Mailund T, Drautz-Moses DI, Schuster SC, Herrera-Estrella L, Lindqvist C.   +15 more
europepmc   +2 more sources

Efficacy of bear spray as a deterrent against polar bears

Wildlife Society Bulletin, 2023
Although there have been few attempts to systematically analyze information on the use of deterrents on polar bears (Ursus maritimus), understanding their effectiveness in mitigating human‐polar bear conflicts is critical to ensuring both human safety ...
James M. Wilder, Lindsey S. Mangipane, Todd Atwood, Anatoly Kochnev, Tom Smith, Dag Vongraven   +5 more
doaj   +1 more source

Genomic evidence for island population conversion resolves conflicting theories of polar bear evolution. [PDF]

PLoS Genetics, 2013
Despite extensive genetic analysis, the evolutionary relationship between polar bears (Ursus maritimus) and brown bears (U. arctos) remains unclear. The two most recent comprehensive reports indicate a recent divergence with little subsequent admixture ...
James A Cahill, Richard E Green, Tara L Fulton, Mathias Stiller, Flora Jay, Nikita Ovsyanikov, Rauf Salamzade, John St John, Ian Stirling, Montgomery Slatkin, Beth Shapiro   +10 more
doaj   +1 more source

The utility of drones for studying polar bear behaviour in the Canadian Arctic: opportunities and recommendations1

Drone Systems and Applications, 2022
Climate-induced sea-ice loss represents the greatest threat to polar bears (Ursus maritimus Phipps, 1774), and utilizing drones to characterize behavioural responses to sea-ice loss is valuable for forecasting polar bear persistence.
Patrick M. Jagielski, Andrew F. Barnas, H. Grant Gilchrist, Evan S. Richardson, Oliver P. Love, Christina A.D. Semeniuk   +5 more
doaj   +1 more source

Hundreds of Unrecognized Halogenated Contaminants Discovered in Polar Bear Serum. [PDF]

Angew Chem Int Ed Engl, 2018
Liu Y, Richardson ES, Derocher AE, Lunn NJ, Lehmler HJ, Li X, Zhang Y, Cui JY, Cheng L, Martin JW.   +9 more
europepmc   +2 more sources

Analyses of key genes involved in Arctic adaptation in polar bears suggest selection on both standing variation and de novo mutations played an important role

BMC Genomics, 2020
Background Polar bears are uniquely adapted to an Arctic existence. Since their relatively recent divergence from their closest living relative, brown bears, less than 500,000 years ago, the species has evolved an array of novel traits suited to its ...
Jose Alfredo Samaniego Castruita, Michael V. Westbury, Eline D. Lorenzen   +2 more
doaj   +1 more source

Determination of polar bear (Ursus maritimus) individual genotype and sex based on DNA extracted from paw-prints in snow

Frontiers in Conservation Science, 2023
Polar bears rely upon sea ice to hunt, travel, and reproduce. Declining sea ice extent and duration has led polar bears to be designated as “threatened” (ESA). Population monitoring is vital to polar bear conservation; but recently, poor sea ice has made
Andrew L. Von Duyke, Justin A. Crawford, Lori Quakenbush, Jennifer R. Adams, Lisette P. Waits   +4 more
doaj   +1 more source

Biomechanical consequences of rapid evolution in the polar bear lineage. [PDF]

PLoS ONE, 2010
The polar bear is the only living ursid with a fully carnivorous diet. Despite a number of well-documented craniodental adaptations for a diet of seal flesh and blubber, molecular and paleontological data indicate that this morphologically distinct ...
Graham J Slater, Borja Figueirido, Leeann Louis, Paul Yang, Blaire Van Valkenburgh   +4 more
doaj   +1 more source