Nematodes of the genus Amidostomum (Railliet et Henry, 1909) in wild ducks (Anatinae) of North-western Poland

The study was aimed to quantify infections with nematodes of the genus Amidostomum in wild ducks of north-western Poland. The birds examined (282 individuals re-presenting 16 species) belonged to three, ecologically different, tribes: the Anatini, Aythyini and Mergini. The 923 individuals of Amidostomum found (A. acutum, A. orientale, and Amidostomum sp.) accounted for 29.1 % of all the nematodes identified in the ducks and occurred in 57.8 % of the birds at an average intensity of 5.7 per infested duck. Of all the duck groups examined, the heaviest exposure was found in the adult male Mergini (an average infestation intensity of 15.1 and 12.3 parasites per infested duck and examined duck, respectively