ACKNOWLEDGEMENT
We thank all field workers who collected data for this study and the island inhabitants that made it possible, laboratory technician Randi Røsbak (NTNU, Trondheim) for extracting DNA and microsatellite genotyping, Darryl McLennan (University of Glasgow) for help with telomere data analyses, Yimen Araya-Ajoy (NTNU, Trondheim) for helpful comments on an earlier version of this manuscript, and “Forsknings- og undervisningsfondet i Trondheim ” for financial support (to MLP). This work was funded by the Research Council of Norway (274930) and through its Centres of Excellence scheme (223257). The study was carried out in accordance with permits from the Norwegian Animal Research Authority (FOTS id 11904) and the Ringing Centre at Stavanger Museum, Norway. The authors declare no conflicts of interest.