Results 71 to 80 of about 1,532 (172)

Canadian polar bear population structure using genome‐wide markers

Ecology and Evolution, 2020
Predicting the consequences of environmental changes, including human‐mediated climate change on species, requires that we quantify range‐wide patterns of genetic diversity and identify the ecological, environmental, and historical factors that have ...
Evelyn L. Jensen, Christina Tschritter, Peter V. C. deGroot, Kristen M. Hayward, Marsha Branigan, Markus Dyck, Rute B. G. Clemente‐Carvalho, Stephen C. Lougheed   +7 more
doaj   +1 more source

ENHYDROSS: A New Mechanistic Model Supports the Trans‐Oceanic Dispersal Capability of Terrestrial Vertebrates

Ecology and Evolution, Volume 16, Issue 4, April 2026.
We introduce ENHYDROSS, a new mechanistic model that uses optimal swimming speed and minimum cost of transport to estimate maximum dispersal distances and durations for vertebrates, enabling assessment of long‐distance oceanic dispersal potential. Applied to a range of extant and extinct animals, the model's estimates generally align with observed data;
Alexandros Pantelides, Paul Upchurch, Philip D. Mannion, Elias Gravanis, Donald M. Henderson, Phaedon Kyriakidis   +5 more
wiley   +1 more source

Portable Electric Fencing for Bear Deterrence and Conservation

Human-Wildlife Interactions, 2018
Although bear-inflicted (Ursus spp.) human fatalities are rare in North America, human injuries, property damage, and bear mortalities occur wherever bears and humans commingle.
Tom S. Smith, Bryan Hopkins, John Gookin, Samantha Thompson   +3 more
doaj   +1 more source

Assessing the Ecological Network of Svalbard Through Scaled Interaction Strength Data: Insights From a Century of Research

Ecology and Evolution, Volume 16, Issue 4, April 2026.
In this work, we integrate existing knowledge on interaction strengths into a conceptual model of the Svalbard Ecological Network. We also highlight current knowledge gaps and challenges in establishing a robust baseline of species interactions in the region.
Mikhail K. Zhemchuzhnikov, Tomas Roslin, Stephen J. Coulson, Joël Bêty, Anna Traveset   +4 more
wiley   +1 more source

Efficacy of aerial forward-looking infrared surveys for detecting polar bear maternal dens.

PLoS ONE, 2020
Denned polar bears (Ursus maritimus) are invisible under the snow, therefore winter-time petroleum exploration and development activities in northern Alaska have potential to disturb maternal polar bears and their cubs.
Tom S Smith, Steven C Amstrup, B J Kirschhoffer, Geoffrey York   +3 more
doaj   +1 more source

Ursus maritimus [PDF]

Mammalian Species, 1981
Douglas P. DeMaster, Ian Stirling
openaire   +1 more source

Polar bear dens on the Seal and Caribou Rivers, Manitoba

Arctic Science
During aerial surveys, we opportunistically located clusters of polar bear (Ursus maritimus Phipps, 1774) earth dens on and near the Seal and Caribou Rivers in Northern Manitoba in 2011, 2022, and 2023.
Douglas A. Clark, Joanie L. Kennah, Chantal Cadger MacLean, Stephen N. Atkinson   +3 more
doaj   +1 more source

A body composition model with multiple storage compartments for polar bears (Ursus maritimus). [PDF]

Conserv Physiol, 2023
Penk SR, Sadana P, Archer LC, Pagano AM, Cattet MRL, Lunn NJ, Thiemann GW, Molnár PK.   +7 more
europepmc   +1 more source

Reply to the discussion by Pilfold “Polar bear mass change confirms hyperphagia follows ringed seal whelping”

Arctic Science
The spring is a critical period when polar bears (Ursus maritimus Phipps, 1774) are thought to have peak access to seals and acquire the majority of their annual energy requirements during a period of hyperphagia. Pagano et al. (Pagano A.M., Atkinson S.N.
Anthony M. Pagano, Stephen N. Atkinson, Louise C. Archer   +2 more
doaj   +1 more source

An assessment of microplastics in fecal samples from polar bears (Ursus maritimus) in Canada's North

Arctic Science
We assessed the potential for plastic ingestion in polar bears (Ursus maritimus (Phipps (1774))) using fecal analysis. Two method studies ensured our protocols could effectively recover and identify plastics in feces. First, microplastics (film, foam, or
P.U. Iyare, H.L. Vanderlip, M. Dias, J.F. Provencher, S. Zou, S.C. Lougheed, P.J. Van Coeverden de Groot, G. Whitelaw, M. Branigan, M. Dyck, D.M. Orihel   +10 more
doaj   +1 more source