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Background. Introduction of the common carp, Cyprinus carpio Linnaeus, 1758, may cause a cascade of alterations in trophic webs, among other negative effects, indirectly due to its feeding behaviour. A simplified model site, covenient for studying such interrelations is Lago de Pátzcuaro, México, a shallow lake where carp was first introduced in 1974. The aim of our study was to characterize diet...