Results 41 to 50 of about 7,621 (257)

THE GENUS URSUS IN EURASIA: DISPERSAL EVENTS AND STRATIGRAPHICAL SIGNIFICANCE

Rivista Italiana di Paleontologia e Stratigrafia, 2017
On the basis of the results of former studies by the present authors five main groups of bears are recognized: Ursus gr. minimus - thibetanus (black bears), Ursus gr. etruscus (etruscan bears), Ursus gr. arctos (brown bears), Ursus gr.
MARCO RUSTIONI, PAUL MAZZA
doaj   +1 more source

Polar bear (Ursus maritimus) use of the Cape Bathurst polynya and flaw lead

Arctic Science, 2022
The Cape Bathurst polynya and flaw lead (CBP) are major, predictable habitat features with ≤15% ice cover in an otherwise ice-covered Beaufort Sea, and thought to provide hunting opportunities for polar bears (Ursus maritimus Phipps, 1774).
Erin M. Henderson, Andrew E. Derocher
doaj   +1 more source

Biomechanical evolution of solid bones in large animals: a microanatomical investigation [PDF]

, 2016
International ...
Alexander, Alexandra Houssaye, Amson, Andrew H. Lee, Antoine, Bibi, Blomberg, Buffrénil, Campione, Canoville, Carrano, Carrano, Christiansen, Clementz, Cornette, Cubo, Doube, Doube, Dumont, Evin, Fish, Garland, Garland, Gheerbrant, Gilbert, Girondot, Gray, Gregory, Hayashi, Hildebrand, Hokkanen, Houssaye, Houssaye, Houssaye, Houssaye, Houssaye, Houssaye, Houssaye, John R. Hutchinson, Katja Waskow, Klein, Laurin, Meredith, Nakajima, O'Neill, Oxnard, Oxnard, Polly, Prothero, Quemeneur, R Core Team, Ramsay, Raphaël Cornette, Remes, Ren, Ren, Ripley, Ross, Ruff, Sander, Schalkwyk, Schmidt-Nielsen, Sereno, Shoji Hayashi, Steiner, Straehl, Thompson, Todd, Venables, Vizcaino, Wall, Warner, Waskow   +72 more
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Mandible size and shape in extant Ursidae (Carnivora, Mammalia): A tool for taxonomy and ecogeography [PDF]

, 2017
The family Ursidae is currently one of the taxonomic groups with the lowest number of species among Carnivora. Extant bear species exhibit broad ecological adaptations both at inter- and intraspecific level, and taxonomic issues within this family remain
Adams, Adams, Adams, Adams, Adams, Amano, Arnold, Aryal, Banes, Barnes, Baryshnikov, Bechshøft, Blomberg, Bojarska, Bookstein, Bubadué, Byun, Calvignac, Cardini, Cardini, Cardini, Christiansen, Ciucci, Colangelo, Cronin, Cáceres, Cáceres, Ewer, Figueirido, Fuchs, Galbreath, Garshelis, Gittleman, Gordon, Hall, Herrero, Heteren, Heteren, Heteren, Hijmans, Hwang, Kennedy, Kitchener, Korsten, Krause, Loy, Mattson, McLellan, Meijaard, Meloro, Meloro, Meloro, Meloro, Meloro, Meloro, Meloro, Meloro, Meloro, Mihaylov, Ohdachi, Oksanen, Pagès, Pocock, Pocock, Rausch, Reid, Rohlf, Rohlf, Rohlf, Rohlf, Sacco, Slater, Stirling, Waits, Waits, Wilson, Yoneda, Zedrosser, Zelditch   +78 more
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Worth the dip? Polar bear predation on swimming flightless greater snow geese and estimation of energetic efficiency

Arctic Science, 2023
As sea-ice cover is shrinking, polar bears (Ursus maritimus, Phipps, 1774) face decreased access to seals, their primary prey, resulting in a greater dependence on terrestrial food sources.
Matthieu Weiss-Blais, David Bolduc, Madeleine-Zoé Corbeil-Robitaille, Frédéric Dulude-de Broin, Thierry Grandmont, Frédéric LeTourneux, Mathilde Poirier, Denis Sarrazin, Pierre Legagneux   +8 more
doaj   +3 more sources

Low density of top predators (seabirds and marine mammals) in the high Arctic pack ice [PDF]

, 2016
The at-sea distribution of top predators, seabirds and marine mammals, was determined in the high Arctic pack ice on board the icebreaker RV Polarstern in July to September 2014. In total, 1,620 transect counts were realised, lasting 30 min each.
Boos, K., D'Hert, D., Joiris, C.R., Nachtsheim, D.A.   +3 more
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Ursus maritimus Phipps 1774

, 1982
Ursus maritimus Phipps, 1774. A Voyage Towards North Pole, p. 185. TYPE LOCALITY: Norway, Spitzbergen Isis. DISTRIBUTION: Circumpolar in the Arctic. COMMENT: Placed in genus Ursus, subgenus Thalarctos by Gromov and Baranova, 1981:253, and in genus Thalarctos by Corbet, 1978:166. Reviewed by DeMaster and Stirling, 1981, Mamm. Species, 145:1-7. PROTECTED
Honacki, James H., Kinman, Kenneth E., Koeppl, James W.   +2 more
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Persistent organic pollutant burden, experimental POP exposure and tissue properties affect metabolic profiles of blubber from grey seal pups [PDF]

, 2018
Persistent organic pollutants (POPs) are toxic, ubiquitous, resist breakdown, bioaccumulate in living tissue and biomagnify in food webs. POPs can also alter energy balance in humans and wildlife.
Bennett, Kimberley A., Debier, Cathy, Eppe, Gauthier, Hall, Ailsa J., Robinson, Kelly J., Thomé, Jean Pierre   +5 more
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Prolonged transition time between colostrum and mature milk in a bear, the giant panda, Ailuropoda melanoleuca [PDF]

, 2015
Bears produce the most altricial neonates of any placental mammal. We hypothesized that the transition from colostrum to mature milk in bears reflects a temporal and biochemical adaptation for altricial development and immune protection.
Burchmore, Richard J. S., Griffiths, Kate, Hou, Rong, Kennedy, Malcolm W., Loeffler, I. Kati, Wang, Hairui, Watson, David G., Zhang, Liang, Zhang, Tong, Zhang, Zhihe   +9 more
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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., 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