Increasing or decreasing reproductive effort in migratory birds in a controlled experiment results in oppositely directed carry-over effects, affecting migratory and wintering behaviour, and future breeding performance. This study helps understand how carry-over effects develop and affect the annual cycle of long-lived migratory animals, a central question in life-history theory. Annette L. Fayet et al. http://dx.doi.org/10.1111/1365-2656.12580

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