Helminths of mustelids with overlapping ecological niches: Eurasian otter Lutra lutra (Linnaeus, 1758), American mink Neovison vison Schreber, 1777, and European polecat Mustela putorius Linnaeus, 1758

Summary This study presents the helminthological data on three mustelid species with overlapping ecological niches in Lithuania. In general, 14 helminth species or higher taxa were reported from all mustelids: Isthmiophora melis , Strigea strigis metacercariae, Pseudamphistomum truncatum , Alaria alata mesocercariae, Phyllodistomum folium , Opisthorchis felineus , Metametorchis skrjabini , Mesocestoides sp., Taenia martis , Aonchotheca putorii , Crenosoma schachmatovae , Eucoleus aerophilus , Molineus patens , and Nematoda g. sp. The largest number of helminths was detected in M. putorius (11) and N. vison (10) from wetlands; 7 helminths were detected in M. putorius from forests, and 8 in N. vison and 4 in L. lutra from water bodies. Habitat-related differences were found in the abundance and prevalence of E. aerophilus in M. putorius . M. putorius has higher indices of infection by I. melis , S. strigis metacercariae, and E. aerophilus compared to N. vison in wetlands. Differences in the abundance and prevalence of P. truncatum among N. vison and L. lutra in water bodies have been observed. Helminths detected in N. vison in the present study are native European parasites.