Acknowledgements
We are grateful to the Wildlife Trust of South and West Wales, Skomer wardens Bee Büche and Eddie Stubbings, and Skokholm wardens Giselle Eagle and Richard Brown, for providing the survey maps used in this study, and to Dr Ben Evans for discussions on interpreting pressure fields. We thank Natural Resources Wales for providing the wind data from the Coastguard lookout station at Wooltack point. EL and ELCS are supported by the European Research Council under the European Union’s Horizon 2020 research and innovation program Grant 715874 (to ELCS).