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
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
Habitat Selection and Intrapopulation Spatial Segregation in an Arctic Top Predator at the Southern Limit of Its Range. [PDF]
Glob Chang BiolLocated at the southern extent of the species' range, polar bears in James Bay exhibited intrapopulation variation in space use, resulting in two spatial clusters during the on‐ice season. Some bears remained within southern James Bay, whereas others ranged more broadly north of the bay.
Ross TR +4 more
europepmc +2 more sources
Denning Phenology Mediates Sea-Ice Loss Impacts on Early Reproductive Success in Polar Bears. [PDF]
Glob Chang BiolChanges in overwinter sheltering phenology in response to climate change and their fitness consequences have rarely been studied. Here, we show that climate change has disrupted the phenology of overwinter maternity denning in polar bears, with females emerging from den earlier when sea‐ice had been scarce the preceding year.
Naciri M +6 more
europepmc +2 more sources
Implications of a fuel spill in the Bering and Chukchi Seas for two sentinel marine species: A simulation study. [PDF]
Ecol ApplAbstract Sea‐ice decline has opened Arctic shipping routes lengthening the maritime transit season. Along the Northern Sea Route (NSR), vessel traffic is projected to increase primarily from natural resource development‐related traffic. The NSR traverses the range of the Chukchi Sea (CS) polar bear (Ursus maritimus) subpopulation, and Pacific walrus ...
Woodruff SP +4 more
europepmc +2 more sources
Long-term increases in pathogen seroprevalence in polar bears (Ursus maritimus) influenced by climate change [PDF]
Global Change Biology, 2021 Nicholas Pilfold +2 more
exaly +2 more sources
Members of the family Ursidae in the Museum of Nature of Kharkiv University and their craniological features [PDF]
Theriologia Ukrainica, 2019 The exhibition and scientific collection of the Museum of Nature currently deposit 16 specimens of the family Ursidae (bears), which belong to three species and 6 subspecies.
Yuriy Iliukhin
doaj +1 more source