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Glacial ice supports a distinct and undocumented polar bear subpopulation persisting in late 21st-century sea-ice conditions
Laidre, K.L.; Supple, M.A.; Born, E.W.; Regehr, E.V.; Wiig, Ø.; Ugarte, F.; Aars, J.; Dietz, R.; Sonne, C.; Hegelund, P.; Isaksen, C.; Akse, G.B.; Cohen, B.; Stern, H.L.; Moon, T.; Vollmers, C.; Corbett-Detig, R.; Paetkau, D.; Shapiro, B. (2022). Glacial ice supports a distinct and undocumented polar bear subpopulation persisting in late 21st-century sea-ice conditions. Science (Wash.) 376(6599): 1333-1338. https://dx.doi.org/10.1126/science.abk279
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
Related to:
Peacock, E. (2022). A new polar bear population. Science (Wash.) 376(6599): 1267-1268. https://dx.doi.org/10.1126/science.abq526, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine/Coastal

Authors  Top 
  • Laidre, K.L.
  • Supple, M.A.
  • Born, E.W.
  • Regehr, E.V.
  • Wiig, Ø.
  • Ugarte, F.
  • Aars, J.
  • Dietz, R., more
  • Sonne, C.
  • Hegelund, P.
  • Isaksen, C.
  • Akse, G.B.
  • Cohen, B.
  • Stern, H.L.
  • Moon, T.
  • Vollmers, C.
  • Corbett-Detig, R.
  • Paetkau, D.
  • Shapiro, B.

Abstract
    Polar bears are susceptible to climate warming because of their dependence on sea ice, which is declining rapidly. We present the first evidence for a genetically distinct and functionally isolated group of polar bears in Southeast Greenland. These bears occupy sea-ice conditions resembling those projected for the High Arctic in the late 21st century, with an annual ice-free period that is >100 days longer than the estimated fasting threshold for the species. Whereas polar bears in most of the Arctic depend on annual sea ice to catch seals, Southeast Greenland bears have a year-round hunting platform in the form of freshwater glacial mélange. This suggests that marine-terminating glaciers, although of limited availability, may serve as previously unrecognized climate refugia. Conservation of Southeast Greenland polar bears, which meet criteria for recognition as the world’s 20th polar bear subpopulation, is necessary to preserve the genetic diversity and evolutionary potential of the species.

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