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Fig. 2. Daily foraging effort of Greenland great cormorants throughout the annual cycle., showing one data point every second day; values are means + S.D. (N=3-7). The continuous line shows day length (h). The four phases of the year cycle (chick-rearing, wintering, mating and incubating) were defined after Salomonsen (1967) and Lyngs (2003).





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