not-yet-known not-yet-known not-yet-known unknown Figure 4. Fitted relationships between δ 15N measured in brown bear hair collected in Southcentral Sweden 2006–2020 and the annual index of bilberry production (3A) and bear age and sex (3B). There was no difference between solitary females and females with dependent offspring, so these were combined into a single “female” category. Lines are the fitted relationships from the top model with 95% confidence intervals shaded around the lines. Colored points represent the raw data colored by sex. Additionally, there was also strong support that δ 15N values were lower (i.e., more similar to bilberry values) in years with greater bilberry production ( \({\widehat{\beta}}_{\text{Bilberry}}=\ -0.18,\ 95\%\ CI=\ -0.24\ to-0.12\); Figure 4A. Additionally, δ 15N values increased with bear age, but the effect differed between the sexes (\({\widehat{\beta}}_{\text{age}}=0.14,\ 95\%\ CI=0.02\ to\ 0.26;\ {\widehat{\beta}}_{Sex(M)}=1.21,\ 95\%\ CI=0.61\ to\ 1.81;\ {\widehat{\beta}}_{age*Sex(M)}=0.57,\ 95\%\ CI=0.38\ to\ .075\); Figure 4B).