Arso Civil, MònicaTapp, SallyDickens, JohnLangley, IzzyHiley, HelenTerrapon, MaevaHague, EmilyHewitt, RebeccaCordes, Line S.Graham, IslaCheney, BarbaraThompson, PaulHall , Ailsa J.Sparling, Carol E.2025-11-072025-10Arso Civil, M, Tapp, S, Dickens, J, Langley, I, Hiley, H, Terrapon, M, Hague, E, Hewitt, R, Cordes, L S, Graham, I, Cheney, B, Thompson, P, Hall , A J & Sparling, C E 2025, 'Reduced adult survival estimated in areas of decline of harbour seal populations in Scotland', Ecology and Evolution, vol. 15, no. 10, e72349. https://doi.org/10.1002/ece3.723492045-7758ORCID: /0000-0003-4534-5582/work/196536855ORCID: /0000-0001-7018-3269/work/196538066https://hdl.handle.net/2164/26387Acknowledgements The authors would like to thank Philip Hammond for his advice on the mark–recapture analysis, Chris Morris and Callan Duck for their help in selecting study sites and Jeff Laake for his help solving RMark package hiccups to estimate fecundity, as well as all the local people in Burray and Dunvegan who helped make data collection possible. This work is dedicated to Andy Law, a brilliant naturalist and friend who spent endless hours taking and processing photos of seals at Dunvegan.203235891engcapture-recapturefecundityPhoca vitulinaphoto-identificationpopulation dynamicssurvivalvital ratesQH301 BiologyQL ZoologySupplementary DataDASLinkQH301QLJournal article10.1002/ece3.72349