Bird species dependent on insects for food have declined drastically over the last 50 years (Jetz et al. 2007; Tallamy & Shriver 2021). The impact of insect declines on birds is manifested directly by reducing the birds ability to meet energetic needs, or indirectly through abiotic factors that affect the birds ability to respond to a given environmental change (Bowler et al. 2019). Migratory insectivorous bird species and migratory bird species per se are exposed to drivers that occur during the annual life cycle on the breeding/wintering grounds and during autumn/spring migration (Sherry & Holmes 1995; Faaborg et al. 2010). Population trends of these species are therefore the result of complex interactions of stressors that occur at different spatial scales and during different phases of migration (Spiller & Dettmers 2019). For example, food availability must be ensured throughout the life cycle to avoid a trophic or phenological mismatches on breeding or wintering grounds (Kwon et al. 2019).