Denning habits of the polar bear (Ursus maritimus Phipps)
Author: C. Richard Harington
Publisher:
Published: 1968
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: C. Richard Harington
Publisher:
Published: 1968
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: V. Richard Harington
Publisher:
Published: 1968
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOK"Common denning areas (core areas) for polar bears are northern Greenland, Svalbard, the archipelagos north of the Soviet mainland, and the islands of northern Canada. In autumn, bears are often rafted on broken pack ice to suitable denning places. Some experienced individuals probably find denning areas by their ability to navigate within a region"--Abstract.
Author: C. Richard Harington
Publisher:
Published: 1973
Total Pages: 30
ISBN-13:
DOWNLOAD EBOOKAuthor: Charles Richard Harington
Publisher:
Published: 1968
Total Pages: 30
ISBN-13:
DOWNLOAD EBOOKAuthor: Charles Richard Harington
Publisher:
Published: 1968
Total Pages: 30
ISBN-13:
DOWNLOAD EBOOKAuthor: Ian Stirling
Publisher: University of Michigan Press
Published: 1998
Total Pages: 242
ISBN-13: 9780472081080
DOWNLOAD EBOOKA treasury of information and outstanding photographs brought together to reveal the fascinating life of the symbol of Arctic survival, the polar bear
Author: Randall W. Davis
Publisher: Springer Nature
Published: 2021-07-03
Total Pages: 366
ISBN-13: 3030667960
DOWNLOAD EBOOKSea otters and polar bears are carnivorous marine mammals that still resemble their terrestrial ancestors. Compared with Cetacea (whales and dolphins), Sirenia (dugongs and manatees), and Pinnipedia (seals, sea lions, and walrus), they are less adapted for an aquatic life and the most recently evolved among marine mammals. Sea otters are amphibious but seldom come ashore, and polar bears primarily occur on sea ice or along the shore. When at sea, both species spend most of their time swimming at the surface or making short, shallow dives when foraging or pursuing prey. Indeed, polar bears rarely pursue seals in water. Nevertheless, polar bears are powerful swimmers and will stalk seals from the water. As with many other large carnivores, they are solitary hunters. Although sea otters are gregarious and form aggregations at sea called rafts, they are primarily asocial. Except during mating, the principal interaction among sea otters occurs between a female and offspring during the six-month dependency period. In large carnivores (e.g., wolves and lions) that feed on ungulates, sociality and cooperation are favored because of the need to capture large prey and defend carcasses. Polar bears, which are the largest terrestrial carnivore, are solitary hunters of seals and are neither gregarious nor social. Males and females briefly associate during courtship and mating. During this time, males aggressively compete for females. At other times, males generally avoid each other except for aggregations of males that form while summering on land, and females with cubs avoid males, which are known for infanticide. As with sea otters, the interaction of polar bears outside of mating occurs between a female and her offspring during the 2-3 year dependency period. This interaction is critically important when altricial cubs are born in the winter den. This book provides new insight into the ethology and behavioral ecology of sea otters and polar bears. Each chapter reviews the discoveries of previous studies and integrates recent research using new techniques and technology. The authors also address historic and current anthropogenic challenges for their survival as climate change alters entire marine ecosystems.
Author: U.S. Fish and Wildlife Service. Region 7. Marine Mammals Management
Publisher:
Published: 1994
Total Pages: 98
ISBN-13:
DOWNLOAD EBOOKAuthor: Andrew E. Derocher
Publisher: JHU Press
Published: 2012-03-08
Total Pages: 262
ISBN-13: 1421403056
DOWNLOAD EBOOKPresents an introduction to the polar bear, discussing its evolution, physical characteristics, life cycle, predatory behavior, habitat, and the threats to its existence from global warming.
Author: IUCN/SSC Polar Bear Specialist Group. Working Meeting
Publisher: IUCN
Published: 2002
Total Pages: 174
ISBN-13: 9782831706634
DOWNLOAD EBOOKThese proceedings provide an overview of the ongoing research and management activities on polar bears in the circumpolar arctic. Together with the previous 12 proceedings, they provide an historic record of international efforts in protecting polar bears from over-harvest and document more recent concerns of threats arising from increased human activities in both the Arctic and in regions far beyond the realm of polar bears. More proactive management is needed to address limitations in the knowledge of population dynamics. New information indicates that the greatest future challenges to polar bear conservation may be ecological change in the Arctic due to climate change and pollution. The complex, global nature of the issues requires international cooperation and development of diverse, new approaches to address them.