Seasonal Changes in Activity, Sex Composition and Areal of the Tick Ixodes ricinus (Acari, Ixodida) in the Landscape-Geographical Regions of Ukraine

I. Akimov 1  and I. Nebogatkin 1
  • 1 Schmalhausen Institute of Zoology, NAS of Ukraine, B. Chmielnicky str., 15, Kyiv, 01601 Ukraine

Seasonal Changes in Activity, Sex Composition and Areal of the Tick Ixodes ricinus (Acari, Ixodida) in the Landscape-Geographical Regions of Ukraine

Data on seasonal activity of adults, nymphs and larvae of the sheep tick Ixodes ricinus Linnaeus are presented based on examination of our own collections for the period from 1977 to 2001 and archival materials for the period from 1953 to 2000, as well as data on changes in its natural habitat that now covers the whole territory of Ukraine. The period of activity in I. ricinus imagoes becomes longer from north to south and from west to east. In Ukrainian populations of I. ricinus, females slightly dominate (on average 52.44 ± 0.55%). The seasonal differences in the sex ratio are as follows: males are more abundant in springtime, females - in autumn. Significantly larger numbers of females (on average 52-60%) are registered on population peaks, and larger numbers of males - on their decrease.

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