Seasonal changes in populations of Ixodes persulcatus and I. pavlovskyi on the border between the forest and forest-steppe zones of the Ob region

The seasonality of epidemic and epizootic processes of tick-borne encephalitis (TBE) and borreliosis among the populations of Ixodes persulcatus and Ixodes pavlovskyi ticks was studied. The study was carried out in 2011–2012 on the flatland part of Toguchin and in the vicinities of Akademgorodok in Novosibirsk, on the border between the forest and forest-steppe zones of the Ob region. The results obtained for I. persulcatus did not contradict the previously published studies. The starting point and peak of mass activity of I. pavlovskyi ticks were registered later (the last ten days of May) than that of I. persulcatus ticks. Seasonal variations in the physiological age of I. pavlovskyi ticks were similar to that of I. persulcatus ticks. The only exception to this was detected in the last ten days of April when young specimens prevailed in the population of I. pavlovsky ticks in contrast to the I. persulcatus population. The large influence of I. persulcatus on the circulation of TBE was shown, as well as the influence of I. pavlovskyi on the spreading of Borrelia burgdorferi s.l.