HELMINTHS BIODIVERSITY IN THE FERAL REINDEER ON BERING ISLAND (COMMANDOR ISLANDS)
The article presents the taxonomic diversity of helminths of the introduced domestic reindeer (Rangifer tarandus) on the island Bering. Animal faeces (42 pcs.) were collected in the autumn 2021. Faeces were studied by coprohelminthic-, -larvo-, and -ovoscopy methods, followed by the study of the morphology and morphometry of found helminths (at various stages of their development), as well as by molecular phylogenetic methods (sequencing of the ITS2 region). We have identified parasitic worms belonging to two classes (Nematoda and Cestoda) and seven genera (Nematoda: Ostertagia, Trichostrongylus, Nematodirus, Nematodirella, Capillaria, Dictyocaulus; Cestoda: Moniezia). By molecular phylogenetic methods, the systematic position of two of them was refined to species: N. longissimispiculata and O. gruehneri (O. arctica), a dimorphic species. Invasion extensity was 69.05 % for gastrointestinal strongylids; 2.38 % for dictyocaulas; 33.33 % for capillarias and 4.76 % for moniezias. The revealed helminthic pro le of animals islands Bering is characteristic of reindeer sensu lato. Dictyocaulus is the most dangerous, since it is a lung worm, the invasion of which often causes the death of young animals, and in conditions of island isolation, it is not necessary to count on the release of pastures from its larvae.