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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03646

    Population genetic structure of diphyllobothriid tapeworms (Cestoda: Diphyllobothriidea) parasiting fish in the Baikal Rift Zone

    Ivan A. Kutyrev*, Viatcheslav A. Mordvinov

    *Corresponding author:

    ABSTRACT: Tapeworms of the genus Dibothriocephalus are widely distributed throughout the world, some of which are agents of human diphyllobothriasis, one of the most important fish-borne zoonoses caused by a cestode parasite. Until now, the population genetic structure of diphyllobothriid tapeworms in the Baikal Rift Zone (BRZ) has remained unexplored. The major aim of this study was to analyse the population genetic structure of D. dendriticus and D. ditremus species parasiting fish in the BRZ based on ITS1 and cox1 sequences. We found that both species had complex population genetic structures. All species formed two clades that differed in genetic diversity. D. dendriticus haplotypes in Clade 1 formed a star-like sub-network with a main haplotype, whereas the haplotypes in Clade 2 formed a diffuse network. We assumed that the complex population genetic structure of D. dendriticus was a consequence of populations forming in different palaeoecological conditions during the Last Glacial Maximum. In contrast to D. dendriticus, both clades in the D. ditremus samples formed a diffuse network. Our findings revealed hypothetical pathways in the formation of the population genetic structure of diphyllobotriids in the BRZ. On one hand, isolation by distance played an important role. On the other hand, lake recolonisation from refugia and genetic bottleneck after the end of the Last Glacial Maximum had a possible influence.