Changes in migration

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The decline of Afro-Palaearctic migrants and an assessment of potential causes (2014, unknown): “These inconsistencies may be real or a result of using different methods (Lehikoinen & Sparks 2010), or even sampling effects whereby smaller population sizes lead to apparent later arrival.”
Phenological advancement in arctic bird species: relative importance of snow melt and ecological factors (2014, background): “1999; Both and Visser 2001) unlike short-distance migrants that may by more reliant on climatic cues to time migration (Miller-Rushing et al. 2008; Lehikoinen and Sparks 2010; Doxa et al. 2012).”