acredula, are remarkably similar both in phenotype and genotype and have a narrow contact zone in central Scandinavia. The two willow warbler subspecies, Phylloscopus trochilus trochilus and P. In addition to comparing differences in migratory strategy we include a temporal component and contrast patterns between breeding adults and autumn migrating juvenile birds of both subspecies. We contrast the gene expression profiles of two closely related songbird subspecies with divergent migratory phenotypes. Here we make an attempt to get insight into the genetic architecture controlling this complex innate behaviour. We still have limited knowledge about the underlying genetic mechanisms that enable migrating species of birds to navigate the globe.
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