Recent phenological shifts of migratory birds at a Mediterranean spring stopover site: Species wintering in the Sahel advance passage more than tropical winterers.

The marginal mean slope of peak date of passage for males of the Sahel group was significantly different from zero (-0.7 ± 0.2 days per year, p = 0.002) and marginally non-significant in males of the Tropical group (-0.3 ± 0.2 days per year, p = 0.061).

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