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Appendix S1. Detailed description of methods used to estimate diet and fasting behavior.

Appendix S2. Detailed description of statistical methods used to compare body condition and reproduction between the two polar bear populations and periods.

Table S1. Sex and age class of bears captured in the Chukchi Sea during 1985–1994 and 2008–2011 and in the southern Beaufort Sea during 2008–2011.

Table S2. Parameters of modified von Bertalanffy growth equations fit to total body length, skull width, and body mass of polar bears captured in the Chukchi and southern Beaufort Seas during 2008–2011 and in the Chukchi Sea during 1986–1994.

Table S3. Results from comparisons of body size and condition for polar bears captured in the Chukchi Sea (CS) during 1986–1994 and 2008–2011 using general linear models.

Table S4. Results from comparisons of body size and condition for polar bears captured in the Chukchi Sea (CS) and the Southern Beaufort Sea between 2008 and 2011 using general linear models.

Table S5. Estimated energy density (based on models by Molnár et al., 2009) of male and female polar bears from various populations across the Arctic based on asymptotic body length and body mass from a modified von Bertalanffy growth curve.

Table S6. Contribution of prey items to diets of polar bears captured in the Chukchi and Bering Seas during the spring based on fatty acid composition of fat biopsies. Data represent the % contribution to polar bear fatty acid profiles and thus reflect the relative contribution to polar bear diets on a biomass basis. Subadults include bears aged 2–4 years.

Figure S1. Annual variation in the mean minimum distance between sea ice of 15% (a) and 50% (b) concentration and the continental shelf break (300 m isobath) between 1979 and 2010 in the Chukchi Sea and southern Beaufort Sea.

Figure S2. Annual variation in the number of reduced ice days defined as days in which there was less than 6250, 10 000, or 25 000 km2 of either 15% (a) or 50% (b) ice concentration over the continental shelf (<300 m ocean depth) in the Southern Beaufort Sea and Chukchi Sea during 1979–2010.

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gcb12339-sup-0003-FigureS2.JPGimage/JPG879K 

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