Genetic diversity of Ixodes pavlovskyi and I. persulcatus (Acari: Ixodidae) from the sympatric zone in the south of Western Siberia and Kazakhstan
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The most epidemiologically significant tick species in Siberia involved in transmission of a large number of pathogens causing human infectious diseases is Ixodes persulcatus. Ixodes pavlovskyi, being more active, also poses epidemiological threats. These tick species share morphology, activity seasons and geographic distribution range. In this paper, we characterize the geographic and genetic structures of I. persulcatus and I. pavlovskyi populations inhabiting the southern part of Western Siberia (Russia and Kazakhstan)—the western part of I. pavlovskyi distribution range. The data are based on six distinct Ixodes tick populations. Analysis of the concatenated mitochondrial marker sequences (16S rRNA and COI) and the nuclear sequence (ITS2) showed genetic polymorphisms in both I. persulcatus and I. pavlovskyi ticks inhabiting the sympatric zone. We could not determine the phylogeographic structure of I. pavlovskyi populations whereas for I. persulcatus significant within-region variance was shown. Notably, the abundance of I. persulcatus ticks negatively correlates with nucleotide and haplotype diversity in the concatenated sequence of mitochondrial gene (16S rRNA and COI) fragments. This is the first description of the genetic polymorphism of I. persulcatus and I. pavlovskyi ticks coexisting in a sympatric zone based on analysis of mitochondrial and nuclear markers.
Keywords16S rRNA COI ITS2 Ixodes persulcatus Ixodes pavlovskyi Geographical distribution
The research was supported by the Russian Foundation for Basic Research (15-29-02479 obr_i).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest. This article does not contain any studies with human participants or animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.
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