Relationship between the probability (± SE represented by the gray polygon) of a section of terrestrial, coastal habitat being used during the summer (i.e., for > 7 days between August and October) by female polar bears in 1986–1995 and 2008–2013 (A) or for denning in 1986–1999 and 2000–2013 (B) in the Chukchi Sea and ice retreat date (i.e., the first ordinal date in which ice of ≥15% concentration exceeded 50 km from the coastal location).

Summering data were only available during the time periods included in (A) whereas some dens were identified between 1996–2007 (see Fig 3). Coastal habitats included locations in Alaska, Chukotka, and on Wrangel and Herald Islands.