The decline of Afro-Palaearctic migrants and an assessment of potential causes

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Light‐level geolocators reveal migratory connectivity in European populations of pied flycatchers Ficedula hypoleuca (2016, neutral): “Yet, it is unclear how well these complex migratory life-styles are suited to successfully adapt to ongoing rapid environmental changes that many Afro-Palearctic migrants currently face at different parts of their annual cycle (Knudsen et al. 2011, Vickery et al. 2014).”
An analysis of trends, uncertainty and species selection shows contrasting trends of widespread forest and farmland birds in Europe (2019, background): “These species winter in sub-Saharan Africa or Asia and many 107 have declined (Vickery et al. 2014), but these trends may not have been driven by changes in the 108 European habitats the indices were designed to represent and it is possible that migrant birds might 109 dominate and drive trends in…”
Preliminary assessment of the scope and scale of illegal killing and taking of birds in the Mediterranean (2016, background): “Robustly quantifying the scale and scope of the illegal killing and taking of birds and its possible impact on individual species is therefore an urgent priority (Vickery et al. 2014 ), as well as the sustainability of the harvest of birds (both legal and illegal components) at the flyway scale.”