ACKNOWLEDGEMENTS
We are grateful to the inhabitants in our study area at the Helgeland
coast, whose hospitality made this study possible. We also thank
fieldworkers and laboratory technicians who contributed to generating
the data used in the study. The empirical research was carried out in
accordance with permits from the Norwegian Environment Agency and the
Ringing Centre at Stavanger Museum, Norway. This study was supported by
grants from the Research Council of Norway (project numbers 274930 and
302619). This work was also partly supported by the Research Council of
Norway through its Centres of Excellence funding scheme (project number
223257). The authors declare no conflicts of interest.