Fig. 2

Yearly variation in relevance of the main fish families in the diet of kittiwake nestlings and adults based on calculations of total biomass. nSt number of stomachs containing fish remains used for calculations of biomass; nFi number of individual fish used for calculations of biomass; see “Materials and methods” for details of calculations. The results of one adult kittiwake from 2001 are not shown due to low sample size (nSt = 1, nFi = 1). Note that all chicks of 2002 fell from the cliffs during a heavy storm, i.e. got killed in an accident