Results 21 to 30 of about 591,166 (254)

Changes in the distribution of nesting Arctic seaducks are not strongly related to variation in polar bear presence

Arctic Science, 2020
Contemporary climate change is predicted to expose some species to altered predation regimes. Losses of Arctic sea ice are causing polar bears to increasingly forage on colonial seaduck eggs in lieu of ice-based hunting of marine mammals.
Cody J. Dey, Christina A.D. Semeniuk, Samuel A. Iverson, H. Grant Gilchrist   +3 more
doaj   +1 more source

Sea-ice indicators of polar bear habitat [PDF]

The Cryosphere, 2016
Nineteen subpopulations of polar bears (Ursus maritimus) are found throughout the circumpolar Arctic, and in all regions they depend on sea ice as a platform for traveling, hunting, and breeding.
H. L. Stern, K. L. Laidre, K. L. Laidre
doaj   +1 more source

Polar Bear Fossil and Archaeological Records from the Pleistocene and Holocene in Relation to Sea Ice Extent and Open Water Polynyas

Open Quaternary, 2022
The polar bear ('Ursus maritimus') is the apex predator of the Arctic but its distribution throughout the Pleistocene and Holocene has not previously been reported.
Susan J. Crockford
doaj   +1 more source

Field metabolic rate and PCB adipose tissue deposition efficiency in East Greenland polar bears derived from contaminant monitoring data. [PDF]

PLoS ONE, 2014
Climate change will increasingly affect the natural habitat and diet of polar bears (Ursus maritimus). Understanding the energetic needs of polar bears is therefore important.
Viola Pavlova, Jacob Nabe-Nielsen, Rune Dietz, Jens-Christian Svenning, Katrin Vorkamp, Frank Farsø Rigét, Christian Sonne, Robert J Letcher, Volker Grimm   +8 more
doaj   +1 more source

Temporomandibular Joint Pathology of Wild Carnivores in the Western USA

Frontiers in Veterinary Science, 2021
Skull specimens from: southern sea otter (Enhydra lutris nereis), Eastern Pacific harbor seal (Phoca vitulina), California sea lion (Zalophus californianus), northern fur seal (Callorhinus ursinus), walrus (Odobenus rosmarus), polar bear (Ursus maritimus)
Siobhan S. Rickert, Philip H. Kass, Frank J. M. Verstraete   +2 more
doaj   +1 more source

Anthropogenic food: an emerging threat to polar bears

Oryx, 2023
Supplemental food from anthropogenic sources is a source of conflict with humans for many wildlife species. Food-seeking behaviours by black bears Ursus americanus and brown bears Ursus arctos can lead to property damage, human injury and mortality of ...
Tom S. Smith, Andrew E. Derocher, Rachel L. Mazur, Geoff York, Megan A. Owen, Martyn Obbard, Evan S. Richardson, Steven C. Amstrup   +7 more
doaj   +1 more source

Traditional Knowledge About Polar Bears (Ursus maritimus) in East Greenland: Changes in the Catch and Climate Over Two Decades

Frontiers in Marine Science, 2018
In Greenland, polar bears (Ursus maritimus) are nutritional, economic, and cultural subsistence resources for Inuit. Traditional Ecological Knowledge (TEK) collected from subsistence hunters can provide important insights and improve management decisions
Kristin L. Laidre, Allison D. Northey, Fernando Ugarte   +2 more
doaj   +1 more source

Modelling polar bear maternity den habitat in east Svalbard

, 2020
We evaluated a novel tool that predicts possible maternity den habitat of the polar bear (Ursus maritimus) based on a physical snow transport model, a digital terrain model and weather data.
Aars, Jon, Liston, Glen E, Merkel, Benjamin   +2 more
core   +1 more source

Comments to a polar bear population model

, 1985
Larsen, T. & Ugland, K. I. (Polar Research 2 n.s., 117-118) note correctly that a Leslie matrix model treats cubs and females as independent units which is not the case for polar bears.
Øritsland, Nils Are
core   +1 more source

Modelling of polar bear populations by the Leslie matrix population model

, 2010
Some general doubts have been voiced regarding the soundness of using a Leslie matrix population projection on polar bear ...
Larsen, Thor, Ugland, Karl I.
core   +1 more source