The northern shrimp population has been declining in recent years, while there is an ongoing recovery of Atlantic cod (ICES, 2014, Jensen, 2003). Trends may be related to positive correlations between cod biomass and ocean temperature, along with strong negative correlations between shrimp and cod biomass (Worm & Myers, 2003). Among the bird species, especially common eider and thick-billed murre have suffered large population declines, which has been linked to hunting and egg collection. Eiders have responded positively as restrictions have been enforced, while murres have kept declining (Christensen, Mosbech, & Geertz-Hansen, 2015, Merkel, 2010).