Results 81 to 90 of about 7,579 (247)

Validation of grizzly bear hair hormone profiles as a tool to monitor population demographics

The Journal of Wildlife Management, Volume 90, Issue 2, February 2026.
We measured 16 steroid and thyroid hormone concentrations in grizzly bear hair to predict sex, age class, and reproductive status. Models were highly accurate when predicting sex and age class and showed promise for assessing reproductive status. Results illustrate the potential for hair hormone profiles as non‐invasive population monitoring tools ...
Abbey E. Wilson, Cameron J. R. McClelland, Sarah A. Michaud, Jun Han, Gordon Stenhouse, David R. Goodlett, Kristenn Magnusson, Karen Graham, Hugo Fernández‐Bellon, David M. Janz, Darío Fernández‐Bellon   +10 more
wiley   +1 more source

The ecological and behavioral significance of short-term food caching in polar bears (Ursus maritimus)

Arctic Science, 2020
The paucity of observations of wild polar bears (Ursus maritimus) caching of food (including hoarding, i.e., burying and remaining with a kill for up to a few days) has led to the conclusion that such behavior does not occur or is negligible in this ...
Ian Stirling, Kristin L. Laidre, Andrew E. Derocher, Rinie Van Meurs   +3 more
doaj   +1 more source

BRUCELLA SPECIES SURVEY IN POLAR BEARS (URSUS MARITIMUS) OF NORTHERN ALASKA [PDF]

Journal of Wildlife Diseases, 2010
We report on the presence of specific antibodies to Brucella spp. and Yersinia enterocolitica in polar bears (Ursus maritimus) from northern Alaska (southern Beaufort Sea) during 2003-2006. Based on numerous known stressors (e.g., climate change and loss of sea ice habitat, contaminants), there is increased concern regarding the status of polar bears ...
O'Hara, Todd M., Holcomb, Darce, Elzer, Philip, Estepp, Jessica, Perry, Quinesha, Hagius, Sue, Kirk, Cassandra   +6 more
openaire   +2 more sources

South American giant short-faced bear (Arctotherium angustidens) diet: evidence from pathology, morphology, stable isotopes, and biomechanics [PDF]

, 2014
Fil: Soibelzon, Leopoldo Héctor. División Paleontología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Grinspan, Gustavo A.. Núcleo de Biomecánica. Espacio Interdisciplinario.
Acosta, Walter G., Blanco, Ernesto R., Bocherens, Hervé, Grinspan, Gustavo A., Jones, Washington, Prevosti, Francisco, Soibelzon, Leopoldo Héctor   +6 more
core   +1 more source

An integrated social–ecological–evolutionary–phenotypic (SEEP) approach to understanding animal responses to urbanization

Biological Reviews, Volume 101, Issue 1, Page 419-436, February 2026.
ABSTRACT Humans play key roles in shaping the structure and processes of ecosystems globally, especially in cities. This recognition has prompted a recent focus on understanding urban systems via interactions between human social systems and ecological and evolutionary processes.
Kevin E. McCluney, Pierre Deviche, Karen L. Sweazea, Elizabeth J. Carlen, Jeffrey A. G. Clark, Aaron M. Grade, Jeffrey D. Haight, Chase Niesner, Shaylynn Trego, Katherine C.B. Weiss   +9 more
wiley   +1 more source

Polar bearUrsus maritimushearing measured with auditory evoked potentials [PDF]

Journal of Experimental Biology, 2007
While there has been recent concern about the effects of sound on marine mammals, including polar bears, there are no data available measuring the hearing of any bear. The in-air hearing of three polar bears was measured using evoked auditory potentials obtained while tone pips were played to three individually anaesthetized bears at the Kolmården ...
Paul E, Nachtigall, Alexander Y, Supin, Mats, Amundin, Bengt, Röken, Thorsten, Møller, T Aran, Mooney, Kristen A, Taylor, Michelle, Yuen   +7 more
openaire   +2 more sources

An Energetic Tradeoff Best Explains Parturition Timing in Grizzly Bears

Ecology and Evolution, Volume 16, Issue 1, January 2026.
Capitalizing on latitudinal denning‐chronology variation among four grizzly bear populations in interior North America, and using grizzly bear parturition dates (27 Dec–28 Feb) previously predicted from anomalous daily motion counts, we found evidence supporting the hypothesis that birth is optimally timed relative to den exit to balance an energetic ...
Cecily M. Costello, Lori L. Roberts, Daniel D. Bjornlie, Matthew D. Cameron, Justin G. Clapp, Mark A. Haroldson, Grant V. Hilderbrand, Kyle Joly, Wayne F. Kasworm, Jeremy M. Nicholson, Thomas G. Radandt, Mathew S. Sorum, Justin E. Teisberg, Frank T. van Manen, Milan A. Vinks   +14 more
wiley   +1 more source

First recorded ice entrapment of a beluga whale (Delphinapterus leucas) in east Greenland

Polar Research
Beluga whales are rare along the coast of east Greenland and the closest recognized stock occurs around Svalbard. Here we report on an ice entrapment of an adult beluga whale (Delphinapterus leucas) in north-east Greenland.
Kristin L. Laidre, Jasmine Ware, Marie Zahn, Peter Hegelund, Jon Aars   +4 more
doaj   +1 more source

Ringed Seal (Pusa hispida) Haul‐Out Behavior and Emergence Timing in the Bering, Chukchi, and Beaufort Seas

Ecology and Evolution, Volume 16, Issue 1, January 2026.
In the spring, ringed seals (Pusa hispida) shift from predominantly hauling out in lairs to predominantly hauling out on the surface of the sea ice to bask and molt, a transition we refer to as “emergence.” We used hidden Markov models (HMMs) to analyze haul‐out timelines from satellite‐linked transmitters to estimate emergence dates of ringed seals ...
Jessica M. Lindsay, Paul B. Conn, Peter L. Boveng, Justin A. Crawford, Lori T. Quakenbush, Andrew L. Von Duyke, Kristin L. Laidre   +6 more
wiley   +1 more source

T-lymphocyte-rich thymoma and myasthenia gravis in a Siberian tiger (Panthera tigris altaica) [PDF]

, 2014
A 10-year-old captive male Siberian tiger (Panthera tigris altaica) presented with acute onset collapse, vomiting and dyspnoea, preceded by a 6-month period of progressive muscle wasting.
A. Routh, Allen, Aronsohn, Blaies, Brandes, C. Lamm, Day, Dewey, Ecco, Hadlow, ISIS, Jacobs, K. Allan, K. Berry, Kang, Kenny, King, Kunzel, Marx, N. Masters, Pye, Ramos-Vara, S. Rivers, Schwartz, Scudamore, Shelton, Shelton, Suster, Travis, Valli, Wallace, Walsh   +31 more
core   +1 more source