Millions of birds migrate to and from the Arctic each year, but rapid climate change in the
High North could strongly affect where species are able to breed, disrupting migratory …

Climate change may influence the phenology of organisms unequally across trophic levels
and thus lead to phenological mismatches between predators and prey. In cases where prey …

Evolutionary theories of seasonal migration generally assume that the costs of longer
migrations are balanced by benefits at the non‐breeding destinations. We tested, and …

Background Speciation with gene flow is an alternative to the nascence of new taxa in strict
allopatric separation. Indeed, many taxa have parapatric distributions at present. It is often …

Many migratory bird species show high levels of site fidelity to their wintering sites, which
confers advantages due to prior knowledge, but may also limit the ability of the individual to …

Intracontinental biotic divisions across the vast Palaearctic region are not well-characterized.
Past research has revealed patterns ranging from a lack of population structure to deep …

Correct assessment of species limits and phylogenetic relationships is a prerequisite for
studies in ecology and evolution. Even in well-studied groups such as birds, species …

Exploring the patterns of genetic structure in the context of geographical and phenotypic
variation is important to understand the evolutionary processes involved in speciation. We …

Knowing what birds eat is fundamental to understand the ecology and distribution of
individuals and populations. Often, diet is assessed based on field observations and …

Abstract The Eurasian Black Tern, Chlidonias niger niger, nests in marshes continuously
distributed across Eurasia, but migration routes, staging sites, and non-breeding …