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C Influences of fishery activities on herring gulls and great black-backed gulls (Larus argentatus, L. mannus) wintering on the island of Helgoland, south-eastern North Sea, were studied When cod flshery discards were available close to the island. 83 to 87 % of the gulls' pellets contained fishery discard remains and 70 to 73 % of all pellets consisted exclusively of these. At times when no nearby trawling took place (Christmas/New Year), numbers of herring gulls dropped by up to 86 % anddoi:10.3354/meps194241 fatcat:tfzzohdnwja6japtj7k7ntqwoy