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Population consequences of migratory variability differ between flyways

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Abstract

Long-distance migratory bird populations are likely to be declining because of climate change shifting habitats or anthropogenic habitat loss [1], but this may be mediated by the size of the non-breeding area over which a population spreads (migratory spread), and migration distance (or number of stop-over sites). High migratory spread may make populations more resilient to climate change because they already encompass shifting habitats, but less resilient to uneven habitat loss that may not affect populations with low migratory spread [2] (Figure 1C). As migration distance increases so the probability of encountering a stop-over site with negative environmental change increases [3] (Figure 1D). Consequently, if habitat shift through climate change is the main driver of declines we predict more positive population trends for high spread migrants, but the reverse for outright habitat loss (Figure 1E); we also predict negative population trends for longer distance migrants (Figure 1F). But these relationships may vary between flyways, which differ profoundly in their climate variation, human population change and geography. Here we show that climate change may be more important in Neotropic migrant population declines whereas habitat loss may be more important in the Afro-Palearctic.
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Original languageEnglish
Pages (from-to)R340-R341
JournalCurrent Biology
Volume28
Issue number8
Early online date23 Apr 2018
DOIs
Publication statusPublished - 23 Apr 2018

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