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Table 1 Selection of 4 generalized additive models (GAMs) to describe the influence of latitude, tagging longitude, age and the interaction between age and latitude on migration pace (log) and their relative weight according to Akaike’s criterion. Bird ID and year of capture were random effects (re) and distance between receiving stations was included as a covariate. The strongest model (bold) is the full model and the fourth is the null model

From: Spatial structure in migration routes maintained despite regional convergence among eastern populations of Swainson’s Thrushes

Model AIC Delta AIC Model likelihood AIC weight
s(tagging longitude) + s(latitude) + age + s(latitude, by = age, m = 1) + s(distance) + s(year(re)) + s(bird ID (re)) 1898.97 0.0 1.0 0.56
s(tagging longitude) + s(latitude) + s(distance) + s(year(re)) + s(bird ID (re)) 1899.72 0.75 0.69 0.39
s(latitude, by = age, m = 1) + age + s(distance) + s(year(re)) + s(bird ID (re)) 1903.75 4.78 0.09 0.05
s(distance) + s(year(re)) + s(bird ID (re)) 1908.13 9.15 0.01 0.01