Seasonal Shifts in Diet Composition of Great CormorantsPhalacrocorax carbo sinensisforaging at a Shallow Eutrophic Inland Lake

摘要: The diet of Great Cormorants Phalacrocorax carbo sinensis at Lake Dummer, a shallow eutrophic lake 1240 ha in Lower Saxony (Germany) was analysed by collecting 562 regurgitated pellets over period one year. Pellets contained structures 10,645 fishes belonging to 15 species. Substantial differences were found frequency, composition and size prey fish Pikeperch, Ruffe, Roach Perch accounted for the largest seasonal diet. During late autumn winter dominated small-sized cyprinids Ruffe. In spring primarily foraged on larger-sized cyprinids. Young-of-the-year percids, primary during summer. We estimated that least 32.6 tons (26.3 kg/ha) total biomass removed Cormorants, which third (10.8 tons) consisted Pikeperch. 81% Pikeperch August—September, indicating Cormorant is an important predator juvenile ...