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The preferred prey stocks of seabirds have undergone large variations the last decades, either because of overfishing or other variation in the ecosystem. The variation in capelin biomass is for example described above. These large fluctuations have had consequences for some species resulting in either serious declines in e.g. common guillemot, Brünnich’s guillemot and puffin breeding populations, or changes in chick diet composition and chick growth (summarized in e.g. Krasnov and Barrett 1995, Barrett and Krasnov 1996, Barrett et al. 1997, Barrett 2007).