Acker, PaulBurthe, Sarah J.Newell, Mark A.Grist, HannahGunn, CarrieHarris, Michael P.Payo-Payo, AnaSwann, RobertWanless, SarahDaunt, FrancisReid, Jane M.2021-05-042021-05-042021-05-26Acker, P, Burthe, S J, Newell, M A, Grist, H, Gunn, C, Harris, M P, Payo-Payo, A, Swann, R, Wanless, S, Daunt, F & Reid, J M 2021, 'Episodes of opposing survival and reproductive selection cause strong fluctuating selection on seasonal migration versus residence', Proceedings of the Royal Society B: Biological Sciences, vol. 288, no. 1951, 20210404. https://doi.org/10.1098/rspb.2021.04040962-8452ORCID: /0000-0001-5482-242X/work/95222841https://hdl.handle.net/2164/16377Acknowledgements We thank everyone who contributed to fieldwork (ESM S7), particularly Raymond Duncan, Moray Souter, Jenny Sturgeon, Hanna Granroth-Wilding, Katherine Herborn, Olivia Hicks, Richard Howells, Ruth Dunn, Alice Carravieri, Tom Reed and Morten Frederiksen; UK Natural Environment Research Council (NE/R000859/1; NE/R016429/1 through the UK487 SCaPE programme delivering National Capability; NE/M005186/1) and Joint Nature Conservation Committee for funding; Sarah Fenn for helpful comments; and NatureScot for access to the IoM NNR.10441474engannual fitnessextreme climatic eventfecundity selectionmulti-event capture-recapturepartial migrationsex-specific selectionmulti-event capture–recaptureVIABILITY SELECTIONMIGRANTPOPULATIONEVOLUTIONARYFITNESSDIRECTIONAL SELECTIONMALESGE Environmental SciencesQH301 BiologyGeneral Agricultural and Biological SciencesGeneral Environmental ScienceGeneral Immunology and MicrobiologyGeneral Biochemistry,Genetics and Molecular BiologyNatural Environment Research Council (NERC)NE/R000859/1NE/R016429/1NE/M005186/1GEQH301Journal article10.1098/rspb.2021.0404http://www.scopus.com/inward/record.url?scp=85106159423&partnerID=8YFLogxK2881951