Results 11 to 20 of about 19,222 (246)

Late Pleistocene polar bear genomes reveal the timing of allele fixation in key genes associated with Arctic adaptation [PDF]

BMC Genomics
The polar bear (Ursus maritimus) occupies a relatively narrow ecological niche, with many traits adapted for cold temperatures, movement across snow, ice and open water, and for consuming highly lipid-dense prey species.
Yulin Sun, Eline D. Lorenzen, Michael V. Westbury   +2 more
doaj   +2 more sources

Are polar bear habitat resource selection functions developed from 1985–1995 data still useful? [PDF]

Ecology and Evolution, 2019
Greenhouse‐gas‐induced warming in the Arctic has caused declines in sea ice extent and changed its composition, raising concerns by all circumpolar nations for polar bear conservation.
George M. Durner, David C. Douglas, Todd C. Atwood   +2 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

Using tri-axial accelerometers to identify wild polar bear behaviors

Endangered Species Research, 2017
Tri-axial accelerometers have been used to remotely identify the behaviors of a wide range of taxa. Assigning behaviors to accelerometer data often involves the use of captive animals or surrogate species, as their accelerometer signatures are generally ...
Gregory W Thiemann, Anthony Pagano
exaly   +3 more sources

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

Angewandte Chemie - International Edition, 2018
Jonathan Martin, Yanna Liu, Hans-Joachim Lehmler   +2 more
exaly   +2 more sources

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

Metagenomic Composition Analysis of an Ancient Sequenced Polar Bear Jawbone from Svalbard [PDF]

Genes, 2018
Raquel M Silva, Filipe Pereira, Morteza Hosseini   +2 more
exaly   +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