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Figure S1. Relationship between body mass gain and change in fat score in recaptured Gray-cheeked Thrushes at a spring stopover site in northern Colombia during 2010 and 2011. Visible fat deposits were scored on a 9-point scale (0−8), following Kaiser (1993).

Table S1. Candidate model set for predicting body mass change in Gray-cheeked Thrush stopping-over in northern Colombia during spring migration, combining data across two years (2010 & 2011). Models are ordered according to the support they receive from Akaike's Information Criterion (AIC), ∆i and Akaike model weights (Wi). In all models the intercept was forced through the origin (0). I = the interval or number of days since first capture. CI = condition index on first capture (body mass/wing length); D = date on first capture (Julian date where 1 = 1 April); Y = year, two-level factor, 2010 and 2011; A = age, two-level factor, immature and adult; H = hour difference, difference in time of capture between captures; k = number of parameters; Δi = AICi – minimum AIC; : = indicates an interaction (continuous variables) or nesting (factors).

Table S2. Candidate model set for predicting body mass change in Gray-cheeked Thrush stopping-over in northern Colombia during spring migration in 2010. Models are ordered according to the support they receive from Akaike's Information Criterion (AIC), ∆i and Akaike model weights (Wi). In all models the intercept was forced through the origin (0). I = the interval or number of days since first capture. CI = condition index on first capture (body mass/wing length); D = date on first capture (Julian date where 1 = 1 April); A = age, two-level factor, immature and adult; H = hour difference, difference in time of capture between captures; k = number of parameters; Δi = AICi – minimum AIC; : = indicates an interaction (continuous variables) or nesting (factors).

Table S3. Candidate model set for predicting body mass change in Gray-cheeked Thrush stopping-over in northern Colombia during spring migration in 2011. Models are ordered according to the support they receive from Akaike's Information Criterion (AIC), ∆i and Akaike model weights (Wi). In all models the intercept was forced through the origin (0). I = the interval or number of days since first capture. CI = condition index on first capture (body mass/wing length); D = date on first capture (Julian date where 1 = 1 April); A = age, two-level factor, immature and adult; H = hour difference, difference in time of capture between captures; k = number of parameters; Δi = AICi – minimum AIC; : = indicates an interaction (continuous variables) or nesting (factors).

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