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Figure 3: Population fluctuation of selected wintering species: cormorant (Phalacrocorax carbo), tufted duck (Aythya fuligula), goosander (Mergus merganser), great white egret (Egretta alba), bean goose (Anser fabalis), lapwing (Vanellus vanellus), (Eurasian) wigeon (Anas penelope), little grebe (Tachybaptus ruficollis)