Data from: Non-breeding range size predicts the magnitude of population trends in trans-Saharan migratory passerine birds

Jaroslav Koleček, Petr Procházka, Christina Ieronymidou, Ian J. Burfield & Jiří Reif
Understanding why populations of some migratory species show a directional change over time, i.e. increase or decrease, while others do not, remains a challenge for ecological research. One possible explanation is that species with smaller non-breeding ranges may have more pronounced directional population trends, and their populations are thus more sensitive to the variation in environmental conditions in their non-breeding quarters. According to the serial residency hypothesis, this sensitivity should lead to higher magnitudes (i.e....
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