Fortuna, RitaAcker, PaulUgland,, CassandraBurthe, Sarah J.Harris, MichaelNewell, Mark A.Gunn, CarrieHaaland, ThomasSwann, Robert L.Wanless, SarahDaunt, FrancisReid, Jane2024-10-172024-10-172024-10Fortuna, R, Acker, P, Ugland, C, Burthe, S J, Harris, M, Newell, M A, Gunn, C, Haaland, T, Swann, R L, Wanless, S, Daunt, F & Reid, J 2024, 'Season-specific genetic variation underlies early-life migration in a partially migratory bird', Proceedings of the Royal Society B: Biological Sciences, vol. 291, no. 2033, 20241660. https://doi.org/10.1098/rspb.2024.16600962-8452https://hdl.handle.net/2164/24430Open Access via the Royal Society Agreement Acknowledgments We thank everyone who contributed to long-term field data collection, particularly Raymond Duncan, Sarah Fenn, Hannah Grist, Carl Mitchell, Calum Scott, Jenny Sturgeon, Moray Souter, John Anderson, and Harry Bell; NatureScot for allowing work on the Isle of May National Nature Reserve, and Isle of May Bird Observatory Trust for supporting the long-term ringing. We thank Suzanne Bonamour, Craig Walling and two anonymous reviewers for helpful feedback.121496092engAdditive genetic variancecapture-recapture animal modeljuvenileheritabilitymicroevolutionpartial seasonal migrationQH301 BiologyNatural Environment Research Council (NERC)NE/R016429/1NE/M005186/1Supplementary Datahttps://doi.org/10.6084/m9.figshare.c.7449494.v1https://datadryad.org/stash/dataset/doi:10.5061/dryad.j6q573nnrQH301Journal article10.1098/rspb.2024.16602912033