The shifts in polar bear occurrence coincided with trends for shorter sea ice seasons and less sea ice during the spring in the study area. Summer occurrence of polar bears, measured as the probability of encountering bears and the number of days with bear presence, has increased significantly from the 1970/80s to the present. We analyzed time-series of polar bear observations at four locations on Spitsbergen (Svalbard) and one in east Greenland. For these top-predators, longer ice-free seasons are hypothesized to force the bears to hunt for alternative terrestrial food, such as eggs from colonial breeding birds. Polar bears ( Ursus maritimus) depend on sea ice for hunting seals. The Arctic is becoming warmer at a high rate, and contractions in the extent of sea ice are currently changing the habitats of marine top-predators dependent on ice. 12Norwegian Institute for Nature Research (NINA), Trondheim, Norway.10Polish Polar Station Hornsund, Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland.9Department of Vertebrate Ecology and Zoology, University of Gdansk, Gdansk, Poland.8Chair for Landscape Management, University of Freiburg, Freiburg, Germany.7Groupe de Recherche en Ecologie Arctique, Francheville, France.6Institute of Animal Ecology and Nature Education, Gonterskirchen, Germany.5Department of Marine Ecology, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, Netherlands.4Department of Biology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.3Arctic Ecology Department, FRAM-High North Research Centre for Climate and the Environment, Norwegian Institute for Nature Research (NINA), Tromsø, Norway.2FRAM-High North Research Centre for Climate and the Environment, Norwegian Polar Institute, Tromsø, Norway.1Arctic Centre, University of Groningen, Groningen, Netherlands.Gabrielsen 2, Johannes Lang 6,7, Elin Noreen 4, Thomas Oudman 5, Benoit Sittler 7,8, Lech Stempniewicz 9,10, Ingunn Tombre 3, Eva Wolters 11 and Børge Moe 12 Hanssen 3, Claus Bech 4, Sophie Bourgeon 2, Jimmy de Fouw 5, Geir W. Some are hunted for their beautiful fur and some are hunted for sport.Jouke Prop 1 *, Jon Aars 2, Bård-Jørgen Bårdsen 3, Sveinn A. In many parts of the world, bears are hunted for certain organs, such as their gall bladder, for use in traditional medicines. The main predator that all species of bears have to worry about is humans. Mother bears can be very protective of their cubs and will attack if it becomes necessary. They may not attack…but they probably wouldn’t have to after a show like that. When angry they will growl, pound their paws on the ground and charge towards whatever is bothering them. When defending themselves bears make themselves look bigger by fluffing up their fur and standing on their hind legs. Female bears are sometimes killed by larger male bears for food, which is why the female can be quite nervous during mating Other animals, including older male bears, will consider attacking a little cub if its mother is out of It’s the cubs and the smaller females that have to watch out. Their biggest enemies are humans and each other. Would it surprise you to know that an adult bear has almost no predators?īears are large and can be quite intimidating so they don’t have many enemies.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |