Abstract
The ixodid ticks Ixodes ricinus (L., 1758) and I. persulcatus Sch., 1930 are the main vectors of tick-borne encephalitis and Lyme disease pathogens in Karelia. Since the outlines of the natural foci of these infections fully coincide with the distributions of the taiga and castor bean ticks, research into the patterns of their spatial distribution is of high relevance. The results of long-term transect surveys, presented herein, demonstrate changes in the distribution and abundance of I. ricinus since the 1950s. The overall geographic distribution of I. ricinus in Karelia is presently characterized by reduction of its range, non-uniform distribution, and low numbers. In general, the optimal conditions for this species are restricted to the southwestern agroclimatic zone (mostly the territory of Lakhdenpokhskii District), where it also occurred in the past. Changes in the occurrence of I. ricinus can be observed both in its non-shared habitats and in the areas which the species inhabits sympatrically with the taiga tick I. persulcatus. The areas occupied by I. ricinus alone in the western part of the southern agroclimatic zone and also the sympatric areas in the central part of this zone have shrunk, while the sympatric areas in the southwestern zone (Pitkyarantskii and Sortavalskii districts) have grown.
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ACKNOWLEDGMENTS
We are sincerely grateful to our colleagues G.G. Karganova, O.A. Belova, I.S. Kholodilov, L.V. Gmyl (Chumakov Federal Scientific Center for Research and Development of Immune-and-Biological Products of the Russian Academy of Sciences, Moscow) and A.V. Korosov (Petrozavodsk State University) for long-term participation in our field research. Special thanks are due to E.I. Korenberg (Gamaleya National Research Center for Epidemiology and Microbiology, Moscow) for valuable advice and comments on the manuscript.
Funding
This study was supported by State Research Assignment 0218-2019-0075 at the Karelian Research Center of the Russian Academy of Sciences.
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The authors declare that they have no conflict of interest. All the applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All the procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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Translated from Zoologicheskii Zhurnal, 2021, Vol. 100, No. 7, pp. 745–755 https://doi.org/10.31857/S0044513421070035.
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Bespyatova, L.A., Bugmyrin, S.V. On the Distribution of the Castor Bean Tick Ixodes ricinus (Acarina, Ixodidae) in the Republic of Karelia, Russia. Entmol. Rev. 101, 581–591 (2021). https://doi.org/10.1134/S0013873821040084
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DOI: https://doi.org/10.1134/S0013873821040084