Results 41 to 50 of about 1,532 (172)

Barents Sea polar bears (Ursus maritimus): population biology and anthropogenic threats

Polar Research, 2016
This paper examines how anthropogenic threats, such as disturbance, pollution and climate change, are linked to polar bear (Ursus maritimus) population biology in the Svalbard and Barents Sea area, with the aim to increase our understanding of how human ...
Magnus Andersen, Jon Aars
doaj   +1 more source

Circumpolar Study of Perfluoroalkyl Contaminants in Polar Bears (Ursus maritimus) [PDF]

Environmental Science & Technology, 2005
Perfluoroalkyl substances were determined in liver tissues and blood of polar bears (Ursus maritimus) from five locations in the North American Arctic and two locations in the European Arctic. Concentrations of perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate, heptadecafluorooctane sulfonamide, and perfluoroalkyl carboxylates with C(8)-C(15)
Smithwick, M., Mabury, S. A., Solomon, K. R., Sonne, C.; id_orcid 0000-0001-5723-5263, Martin, J. W., Born, E. W., Dietz, R., Derocher, A. E., Letcher, R. J., Evans, T. J., Gabrielsen, G. W., Nagy, J., Stirling, I., Taylor, M. K., Muir, D. C. G.   +14 more
openaire   +4 more sources

Highly Pathogenic Avian Influenza Virus A(H5N1) Clade 2.3.4.4b Infection in Free-Ranging Polar Bear, Alaska, USA

Emerging Infectious Diseases
We report a natural infection with a Eurasian highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus in a free-ranging juvenile polar bear (Ursus maritimus) found dead in North Slope Borough, Alaska, USA.
Raphaela Stimmelmayr, David Rotstein, Mia Kim Torchetti, Robert Gerlach   +3 more
doaj   +1 more source

Tracking Wintertime Behaviour of Emperor Penguins Using High‐Resolution Synthetic Aperture Radar Imagery

Remote Sensing in Ecology and Conservation, EarlyView.
Using 25–30 cm Umbra synthetic aperture radar (SAR) imagery combined with ground validation of our observations, we introduce a method to track the phenology of emperor penguins during the Antarctic winter. We successfully identified events in the breeding cycle, which were previously impossible to observe during the complete darkness of Antarctic ...
Michelle LaRue, Daniel Price, Sarah Wiki‐Bennett, Charles K. Lee, B. Jack Pan, Kyle McCloud, Heather Cruickshank, Alex Ponniah, Daniel Zitterbart, Alexander Winterl, Céline Le Bohec, Rose Foster‐Dyer, Peter Fretwell   +12 more
wiley   +1 more source

Evaluating harvest risk with limited data: A case study on polar bears (Ursus maritimus) in East Greenland

Conservation Science and Practice, EarlyView.
We developed a state‐dependent modeling and management framework to evaluate the demographic effects of different harvest strategies on the East Greenland polar bear subpopulation. This paper is for scientists undertaking wildlife harvest risk assessments for conservation and management, and for wildlife managers responsible for establishing ...
Eric V. Regehr, Kristin L. Laidre, Fernando Ugarte   +2 more
wiley   +1 more source

Updating the forelimb anatomy of the domestic cat (Felis catus, Felidae) based on evolutionary inferences of its muscles and nerves I: Shoulder and brachium

Journal of Anatomy, EarlyView.
In this study, we provide a detailed description of the shoulder and brachium muscles and the brachial plexus of the domestic cat (Felis catus). We identified muscular variants (articularis humeri, coracobrachialis longus, biceps brachii caput breve), clarified the independence of the anconeus medialis muscle from the triceps brachii muscle, and ...
Juan Fernando Vélez García, Ismael Vélez Cabrera, Maria Angelica Miglino   +2 more
wiley   +1 more source

Quantitative assessment of masticatory muscles based on skull muscle attachment areas in Carnivora

The Anatomical Record, Volume 309, Issue 9, Page 2368-2394, September 2026.
Abstract Masticatory muscles are composed of the temporalis, masseter, and pterygoid muscles in mammals. Each muscle has a different origin on the skull and insertion on the mandible; thus, all masticatory muscles contract in different directions. Collecting in vivo data and directly measuring the masticatory muscles anatomically in various Carnivora ...
Kai Ito, Mugino O. Kubo, Ryo Kodera, Sei‐ichiro Takeda, Hideki Endo   +4 more
wiley   +1 more source

Testosterone concentrations in juvenile male polar bears (Ursus maritimus)

Theriogenology Wild
The ex situ polar bear population in the United States is not sustainable. Current management practices include pairing mates at five to six years of age, but there is evidence that wild bears have sired cubs as early as two years old. Timing acquisition
Jessye Wojtusik, Megan Philpott, Elizabeth Donelan, Monica A. Stoops, Terri L. Roth, Erin Curry   +5 more
doaj   +1 more source

Was the giant short-faced bear a hyper-scavenger? A new approach to the dietary study of ursids using dental microwear textures.

PLoS ONE, 2013
Dramatic environmental changes associated with global cooling since the late Miocene, and the onset of glacial-interglacial cycles in the Pleistocene served as a backdrop to the evolutionary radiation of modern bears (family Ursidae). These environmental
Shelly L Donohue, Larisa R G DeSantis, Blaine W Schubert, Peter S Ungar   +3 more
doaj   +1 more source

Myths, Furphies and Red Herrings Associated With Dingo Ecology and Management

Ecological Management &Restoration, Volume 27, Issue 3, September 2026.
ABSTRACT Variability in the inferential strength or reliability of different scientific studies creates uncertainty in the status of knowledge on a given subject, giving rise to multiple myths, furphies and red herrings in scientific discourse. This is particularly true in the case of dingo ecology and management in Australia, which exemplifies common ...
Benjamin L. Allen
wiley   +1 more source