Testosterone and persistent organic pollutants in East Greenland male polar bears (Ursus maritimus) [PDF]
Heliyon, 2023 Legacy persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) are chemicals that undergo long-range transport to the Arctic. These chemicals possess endocrine disruptive properties raising concerns for development and reproduction.
Tomasz M. Ciesielski +8 more
doaj +2 more sources
Case Studies in Polar Bear (Ursus maritimus) Sperm Collection and Cryopreservation Techniques [PDF]
Animals, 2022 Assisted reproductive technologies can aid conservation efforts via support of ex situ population management and preservation of genetic material. Data from 38 sperm collection attempts from 17 polar bears (1–5 procedures/bear) were evaluated.
Jessye Wojtusik +2 more
doaj +2 more sources
An Evolutionarily Young Polar Bear (Ursus maritimus) Endogenous Retrovirus Identified from Next Generation Sequence Data [PDF]
Viruses, 2015 Transcriptome analysis of polar bear (Ursus maritimus) tissues identified sequences with similarity to Porcine Endogenous Retroviruses (PERV). Based on these sequences, four proviral copies and 15 solo long terminal repeats (LTRs) of a newly described ...
Kyriakos Tsangaras +3 more
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Crescentic glomerulonephritis in a polar bear (Ursus maritimus). [PDF]
J Vet Med Sci, 2013 Spontaneous crescentic glomerulonephritis (CrGN) in animals has only been reported in dog and sheep. We report the pathological features of CrGN in a 17-year-old male polar bear that died due to renal failure. Histologically, the lesions were characterized by fibrocellular crescents, adhesion between Bowman's capsule and the glomerular capillary tuft ...
Baba H +5 more
europepmc +3 more sources
Correction to: Yes, they can: polar bears Ursus maritimus successfully hunt Svalbard reindeer Rangifer tarandus platyrhynchus. [PDF]
Polar Biol, 2022 Stempniewicz L, Kulaszewicz I, Aars J.
europepmc +3 more sources
Bacterial diversity in faeces from polar bear (
BMC Microbiology, 2010 Background Polar bears (Ursus maritimus) are major predators in the Arctic marine ecosystem, feeding mainly on seals, and living closely associated with sea ice.
Brusetti Lorenzo +6 more
doaj +2 more sources
Estimating Polar Bear (Ursus maritimus) Age Based on an Epigenetic DNA Methylation Clock [PDF]
Ecology and EvolutionKnowledge of animal age is essential to wildlife managers for obtaining meaningful and accurate insights into demographic parameters. A common approach to aging wildlife, including bears (Ursus spp.), has been extracting a tooth during physical capture ...
Susannah P. Woodruff +4 more
doaj +2 more sources
High contributions of sea ice derived carbon in polar bear (Ursus maritimus) tissue. [PDF]
PLoS ONE, 2018 Polar bears (Ursus maritimus) rely upon Arctic sea ice as a physical habitat. Consequently, conservation assessments of polar bears identify the ongoing reduction in sea ice to represent a significant threat to their survival.
Thomas A Brown +5 more
doaj +2 more sources
Genetic Relationships of Extant Brown Bears (Ursus arctos) and Polar Bears (Ursus maritimus) [PDF]
Journal of Heredity, 2012 Polar bears (Ursus maritimus) and brown bears (Ursus arctos) are closely related species for which extensive mitochondrial and nuclear phylogenetic comparisons have been made. We used previously published genotype data for 8 microsatellite DNA loci from 930 brown bears in 19 populations and 473 polar bears in 16 populations to compare the population ...
Matthew A. Cronin, M. D. MacNeil
openalex +3 more sources
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 +3 more sources