• Mass loss rates of fasting polar bears

      Pilfold, Nicholas W.; Hedman, Daryll; Stirling, Ian; Derocher, Andrew E.; Lunn, Nicholas J.; Richardson, Evan (2016)
      Polar bears (Ursus maritimus) have adapted to an annual cyclic regime of feeding and fasting, which is extreme in seasonal sea ice regions of the Arctic. As a consequence of climate change, sea ice breakup has become earlier and the duration of the open-water period through which polar bears must rely on fat reserves has increased....
    • Migratory response of polar bears to sea ice loss: to swim or not to swim

      Pilfold, Nicholas W.; McCall, Alysa; Derocher, Andrew E.; Lunn, Nicholas J.; Richardson, Evan (2017)
      Migratory responses to climate change may vary across and within populations, particularly for species with large geographic ranges. An increase in the frequency of long-distance swims (> 50 km) is one predicted consequence of climate change for polar bears Ursus maritimus....
    • Polar bear ( Ursus maritimus ) migration from maternal dens in western Hudson Bay

      Yee, Meredith; Reimer, Jody; Lunn, Nicholas J.; Togunov, Ron R.; Pilfold, Nicholas W.; McCall, Alysa G.; Derocher, Andrew E. (2017)
      Migration is a common life history strategy among Arctic vertebrates, yet some of its aspects remain poorly described for some species. In February-March, post-parturient polar bears (Ursus maritimus) in western Hudson Bay, Canada, migrate from maternity den sites on land to the sea ice with three- to four-month-old cubs....