Supplementary Material s12

Supplementary material

Table A1: Full AICc ranked candidate model set (2AICc scores) showing relative

importance of the following parameters on the body condition of great reed warblers at

their final wintering site near Choma, Zambia: staging site: δ15N, δ13C, feather

corticosterone, and interactions with year.

Model Log Likelihood AICc Δi ωi Scaled mass index staging CORTf -106.74 219.99 0 0.27 year, carbon, staging CORTf, year * carbon -103.09 220.08 0.09 0.26 year, staging CORTf -105.64 220.15 0.16 0.25 year, staging CORTf, nitrogen, year * nitrogen -103.91 221.73 1.74 0.11 year, staging CORTf, nitrogen -105.32 221.97 1.98 0.1 BUTY year, nitrogen, year * nitrogen -7.56 26.42 0 0.62 year, carbon, nitrogen, year * nitrogen -6.77 27.41 1 0.38 TRIG year, carbon -6.49 21.92 0 0.33 year, carbon, year * carbon -5.63 22.7 0.78 0.22 year -8.36 23.27 1.35 0.17 year, carbon, staging CORTf -6.04 23.52 1.6 0.15 year, carbon, nitrogen -6.13 23.69 1.78 0.14

Final winter site CORTf carbon, staging CORTf -173.23 355.29 0 0.50 staging CORTf -174.99 356.47 1.18 0.28 carbon, nitrogen -172.79 356.86 1.56 0.23 Table A2. Full results of models in the top model set (top 2 AICc scores) that include an

interaction term. Parameters were chosen using AICc for each response variable (scaled

mass index, B-hydroxybutyrate (BUTY), triglyceride (TRIG), final winter site feather

corticosterone (CORTf); see Methods). All covariates were standardized prior to analyses

such that effect sizes were comparable.

Model Estimate SE t p value Scaled mass index year 4.55 2.58 1.76 0.08

staging CORTf 0.02 0.01 1.22 0.22 carbon -0.16 0.10 -1.56 0.12 carbon * year 0.34 0.15 2.19 0.03 year -7.95 4.22 -1.88 0.06

staging CORTf 0.01 0.01 1.06 0.29 nitrogen -0.56 0.33 -1.70 0.09 nitrogen * year 0.73 0.45 1.61 0.11 BUTY year 1.61 0.57 2.81 0.007 nitrogen 0.09 0.04 2.13 0.04 scaled mass index -0.02 0.02 -1.02 0.31 time at capture -0.0008 0.0005 -1.55 0.13 nitrogen * year -0.17 0.06 -2.89 0.005 year 1.59 0.58 2.76 0.008 carbon 0.01 0.01 0.43 0.66 nitrogen 0.09 0.04 2.04 0.05 scaled mass index -0.02 0.02 -0.96 0.34 time at capture -0.0008 0.0006 -1.37 0.18 nitrogen * year -0.17 0.06 -2.83 0.007 TRIG year 0.38 0.34 1.12 0.27 carbon -0.03 0.02 -1.96 0.06 scaled mass index 0.02 0.02 1.03 0.31 time at capture 0.0004 0.0005 0.79 0.43 carbon * year 0.03 0.02 1.47 0.15 Table A3. Tests for potential sex differences in carry-over effects. General linear models of each response variable (scaled mass index, final winter site CORTf, BUTY, TRIG) were separated by year (see Methods), with interaction terms between sex and all three predictor (carbon, nitrogen, staging CORTf) variables included. No sex differences were detected. P values were adjusted using Bonferroni correction.

Model Estimate SE t p value 2011 scaled mass index carbon * sex 0.12 0.24 0.48 1 nitrogen * sex -1.23 1.39 -0.88 1

staging CORTf * sex -0.03 0.08 -0.41 1 BUTY carbon * sex 0.03 0.07 0.44 1 nitrogen * sex 0.14 0.35 0.39 1

staging CORTf * sex 0.01 0.02 0.73 1 TRIG carbon * sex -0.02 0.05 -0.37 1 nitrogen * sex 0.10 0.28 0.36 1

staging CORTf * sex 0.005 0.02 0.36 1

final winter site CORTf carbon * sex 1.47 1.53 0.96 1 nitrogen * sex -5.54 9.00 -0.61 1

staging CORTf * sex -0.17 0.57 -0.29 1 2012 scaled mass index carbon * sex 0.37 0.20 1.82 0.64 nitrogen * sex -0.02 0.55 -0.03 1

staging CORTf * sex -0.05 0.04 -1.24 1 BUTY carbon * sex 0.05 0.04 1.41 1 nitrogen * sex 0.08 0.09 0.89 1

staging CORTf * sex 0.02 0.007 2.61 0.08 TRIG carbon * sex -0.05 0.04 -1.22 1 nitrogen * sex -0.23 0.12 -1.86 0.56

staging CORTf * sex -0.0002 0.008 -0.03 1

final winter site CORTf carbon * sex 0.28 0.55 0.52 1 nitrogen * sex -0.58 1.42 -0.41 1

staging CORTf * sex 0.04 0.12 0.34 1