Table 2 The variables included in the logistic regression model for the spotted flycatcher via a forward-backward stepwise selection process, ranked by their order of inclusion. All variables are prefixed with “U_” since they showed a unimodal response in the species’ wintering distribution and were included in the model as such. Variable codes are listed in Table 1.

From: Climate-driven shifts in trans-Saharan bird migration illustrated by the spotted flycatcher (Muscicapa striata)